After the cherry tomato is colonized, from slow seedlings to flowering, it is its vegetative growth peak, in this period, it is necessary to make the plant grow robustly and create nutrients for flowering and fruit, at the same time, it can not let the stem and leaves grow too vigorously, resulting in a long period, but affecting the flowering and fruit. Therefore, it is necessary to adjust the relationship between vegetative growth and reproductive growth during the peak period of cherry tomato vegetative growth, so that vegetative growth and reproductive growth are coordinated and balanced, and field tubes are buried to make plants and fruits fully developed in order to obtain high yields.
1. Watering, medium ploughing, squatting seedlings
Cherry tomatoes grow in large quantities, require more water, but are very sensitive to water, when the soil is dehydrated, the plant cannot grow, the seedlings are small, the fruit is slow to develop, and it is prone to viral diseases. Excessive watering or improper watering period, abnormal plant growth, reduced stress resistance, easy to cause falling flowers and fruits, and even due to excessive moisture in the soil, it leads to root or waterlogging. The water management of cherry tomatoes must determine the number of watering and the amount of water according to the environmental conditions and the water demand law of the crop itself.
1. Colonize water. Cherry tomatoes are planted with planting water, also known as root water, which can maintain the water balance of the plant and prevent the plant from dehydrating and dying. This time the watering should be sufficient to ensure the penetration of the colonized soil lump. The next day after colonization, a small amount of water is needed to water to promote the slow seedlings.
2. Slow seedling water. 3-5 days after cherry tomato colonization, when new roots occur and heart leaves begin to grow, they can be watered once to replenish the plant's water needs and turn it into normal growth. It is advisable to water dark water, and the amount of irrigation should not be too large.
3. Cultivation.
After 3-4 days after slowing down the seedling water, it is necessary to carry out medium ploughing in time. This time, the cultivation should be deep between the rows, up to 5-6 cm, and the large soil blocks should be broken, and the side of the plant should be shallow, scratching the ground to avoid hurting the roots. After medium tillage, the soil around the roots is loose and breathable, thereby increasing the soil temperature and promoting root growth. Cohesive soils or low-lying plots with excessive soil moisture can be roughly ploughed once to evaporate some soil moisture first, and then fine tillage is carried out to preserve moisture. It can be cultivated 2-3 times before flowering and fruit setting, and if the soil is too dry, it can be replenished with water, and then cultivated later. Cultivation can be carried out simultaneously in conjunction with weeding to prevent weeds from competing for nutrients. Soil cultivation is also required during the last tillage, that is, loosening the soil between the furrows and cultivating the soil on the furrow surface and around the plant. Later, when the plant grows and the root system is covered with the surface layer of the soil, it is no longer necessary to cultivate.
4. Squat seedlings. Cherry tomato deep cultivation after the squat seedlings, squatting seedlings is through the control of water and temperature, combined with cultivation, in order to achieve appropriate control of aboveground plant growth, adjust the relationship between vegetative growth and reproductive growth, in order to accumulate more nutrients for fruit development. The length of the squat seedling period is the key to mastering the squat seedling technology, which should be flexibly grasped according to the growth status of cherry tomato plants, the moisture content of the soil, the characteristic characteristics of the variety and the environmental conditions. Such as cherry tomato early maturing varieties, belongs to the limited growth type, due to early flowering, plant growth is weaker, fruit set rate is high, vegetative growth is easy to enter the aging state, if the squat seedling time is too long, plant stem and leaf growth is limited, even if the flowering and fruiting is earlier, but due to the lack of sufficient nutrients, it is difficult to obtain early maturation and abundant yield. Generally squat seedlings are considered to end when the first inflorescence begins to bear fruit. If large seedlings are used for colonization, the plant will soon enter the fruiting period, and it will not squat seedlings or squat less mu. The middle and late maturing varieties are mostly infinite growth types, squatting time can be longer, if the squat seedling time is not enough, the plant grows too much, nutrient consumption is too much, easy to grow, resulting in falling flowers and fruits, affecting the yield.
5. Fruit water. Generally, before the first spike of fruit is expanded, it is necessary to pour fruit water 1-2 times, which marks the end of the squat seedlings and the fruit enters the period of rapid expansion. The morning and evening of fruit-inducing water has an important impact on the yield of cherry tomatoes and must be well mastered. If the watering is too early and the fruit is not fully developed and expanded, the nutrients will be transported more to the stem and leaf parts, resulting in excessive nutrient consumption (channeling) and causing fruit drop or delay. If the fruit water is watered too late, the water required for the development of the stems and leaves, especially the fruit, is lacking, and the fruit grows slowly and the yield decreases. Sooner or later, the fruit water should also be flexibly grasped according to the type of variety, soil moisture and environmental conditions. For example, early maturing varieties such as planted in sandy soil, poor moisture plots, and in the event of drought, fruit water should be watered early; while medium and late maturing varieties, planted in clay soil, good moisture plots, and in the rainy season, the fruit water should be watered late. For cherry tomato plants that only leave 3-4 spikes, it is better to pick the heart and then water the fruit, which can avoid the growth of stems and leaves, so that the fruit can get sufficient water and can be rapidly expanded.
6. Fruit water. Cherry tomatoes enter the full fruit stage, the plant grows vigorously, the fruit expands rapidly, and the water consumption is more. After watering the fruit, it is necessary to water frequently to keep the soil moist and the soil surface dry and wet. Generally, water once every 3-4 days, or once every 1-2 harvests. If there is more rain, we must pay attention to timely drainage to prevent waterlogging after rain, poor soil permeability and induce disease and dead plants. In case of drought, areas with insufficient soil moisture should increase the number and amount of watering. It should be noted that although the water demand during the fruiting period is large, each watering should be appropriate, and it should be flexibly mastered according to the growth of the plant, weather and cultivation methods. If there is a red ripe fruit on the plant, it should be harvested first and then watered to prevent the peel from cracking.
Second, water and fertilizer management
Cherry tomatoes have a long growth period and require a lot of nutrients to achieve the purpose of abundant production. Under the premise of applying sufficient base fertilizer, cherry tomatoes cannot ignore topdressing, and it is necessary to consider topdressing organic activated nutrients, nitrogen, phosphorus and potassium calcium fertilizers, and also pay attention to the application of trace element nutrients. Topdressing should be combined with watering to avoid causing fertilizer damage. It is necessary to apply less diligently and as much as possible in a timely and reasonable manner. Topdressing should be based on fast-acting water-soluble fertilizer.
1, seedling fertilizer, if the base fertilizer is sufficient, you can apply less seedling fertilizer. If the base fertilizer is insufficiently applied, the seedling fertilizer should be applied before squatting after slowing down the seedlings. Seedling fertilizer is mainly to allow the seedlings that have just become alive after colonization to get sufficient nutrients immediately, generally one bag of Shi Jiamei bonus per mu + 5-8 kg of internal potassium, combined with slow seedling water, and then cultivated. For early maturing varieties, seedling fertilizer can make the plant start early and bear fruit early.
2. Fruit-inducing fertilizer, when the first spike of fruit begins to expand, it is applied. The profit of Jiamei is 10-15 kg, and a small ditch is opened 10-15 cm from the root to be flushed with the water, or directly applied with drip irrigation, which can meet the needs of rapid expansion of the fruit.
3. First fruit fertilizer, apply the first fruit fertilizer when the first spike of cherry tomatoes begins to harvest. Each acre can be Skamei nuclear power 5-8 kg, while flushing skame dividends a bag. This topdressing is mainly to meet the needs of the growth and development of the 2nd-3rd panicle fruit, so as to avoid weakening or aging of plant growth caused by large-scale fruit harvesting. After this topdressing, it must be watered enough so that the fertilizer effect can be fully utilized.
4, fruit fertilizer, in the second ear of fruit began to harvest, it is the cherry tomato fruit peak period, this period of plant needs the most nutrients, so must be fertilized. During this period, Jiamei Hailibao can be applied 5-8 kg or Jiamei Profit to 15-18 kg or Jiamei Nuclear Power 5-8 kg per mu.
5. Foliar fertilization and application at the expansion stage of the fruit. It is recommended to spray Jiamei Brain Platinum and Jiamei Gold to prevent cracking, poor coloring, deformed fruit, and zombie fruit, and at the same time promote the coloring and brightness of the fruit and enhance the ability of the plant to resist disease and stress.
Third, whole branches, beating branches, thinning flowers and fruits, picking hearts, removing old leaves
Cherry tomato branching ability is strong, each leaf axillary can be pumped side branches, if it is allowed to grow naturally, it will be side branches, the branches and leaves are too dense, affecting ventilation and light transmission, and nutrient consumption is large, the result is reduced, the fruit becomes smaller, the quality becomes worse, the yield is reduced, and the disease and pest are serious. Therefore, when cultivating cherry tomatoes, the plants must be sorted out as needed. Cherry tomato plant arrangement includes whole branches, beating branches, picking hearts, removing old leaves, thinning flowers, vegetables and fruits, etc.
1. Whole branch
Cherry tomato whole branches are the finishing of fruiting branches, which can effectively regulate the relationship between plant vegetative growth and reproductive growth, promote early fruit, multi-fruit, and improve the yield and quality of cherry tomatoes. The main cherry tomato whole branches commonly used in production are single-dry, double-dried, and improved single-stem whole branches.
(1) Single dry whole branch. This is the current production of the common use of the whole branch method, that is, each plant only leaves one trunk, the rest of the side branches are all removed and beaten (that is, the branches), the trunk is picked when there is a certain number of fruit spikes (that is, the top). The single-stem whole branch method is suitable for dense planting and early maturing cultivation, but the number of seedlings per mu is large, and the production cost is relatively high.
(2) Double-stem whole branches. On the basis of the single stem and whole branch, in addition to the main trunk, a side branch is selected as the second trunk, as the resulting branch, so it is called a double stem, except for all the other side branches and regenerated branches on the double stem. The second trunk generally selects the first side branch under the first inflorescence of the main stem, because this side branch is relatively robust, grows and develops quickly, and can soon grow and develop in parallel with the main trunk. This method is suitable for medium to late maturing varieties with high soil fertility, seedling shortage and strong plant growth potential. Double-stem whole branches can save the amount of seeds and seedlings, increase the number of fruits per plant and the yield per plant, but the early yield and total yield are lower, and this whole branch method has less practical application in production.
(3) Improved single-stem whole branches. Also called a dry and a half whole branch, while the main trunk is single-stemmed and whole, the first side branch under the first inflorescence is retained so that it bears l-2 panicles and leaves 2 leaves to pluck the core. Since the growth and development of the first fruit panicle of the first branch is earlier than that of the third fruit panicle on the main trunk, the advantages of single stem whole branch and double whole branch are concentrated, which can be both high yield and early ripening. In terms of production, this whole branch method can be used for self-capped varieties; when the colonization density is too thin or the phenomenon of missing seedlings and ridges, this whole branch method can also be used to remedy.
2. Pawing
Tapping reduces nutrient consumption and ensures normal growth and flowering of the fruiting trunk. When the side branches grow to 6-7 cm, leave 1 leaf to remove, premature will reduce the growth potential of the plant, easy to cause premature aging; too late will cause the loss of nutrients and the growth of the plant, affecting the rapid expansion of the fruit. When beating the bud, it is advisable to use the pushing method, that is, to point the finger at the base of the side bud, and suddenly push it to the side below, so that the side bud falls off; or the bud method, that is, use the finger to pinch the top of the side bud and suddenly break it to the side. Do not use your fingers to break the side buds, so as not to break the mouth unevenly, the wound is difficult to heal, and it is easy to spread viruses and germs. The cane beating is best carried out in a dry and windy climate on a sunny day to make the wound heal easily. If carried out on a rainy day or when the dew is not dry, the wound is prone to decay, which can cause the invasion of germs.
3. Thin flowers, vegetables and fruits
In order to ensure sufficient fruit set rate in production, it is generally not to thin flowers and vegetables and fruits, but if the flowers are found to be abnormal and deformed flowers appear, they should be removed; if the size of the fruit is relatively uniform, it can not be sparse, but the deformed fruits with diseases and insects, too large or too small should be removed.
4. Topping
The topping is also called topping, and when the number of fruit spikes left reaches a certain number, leave two leaves in the upper part of the top panicle and remove the growth point. Timely topping can control the growth of the top of the plant, break the top advantage, so that the nutrients manufactured by the leaves are transported to the fruit, improve the fruit set rate, promote fruit development, and increase yield. Varieties of limited growth types do not have to be picked, while varieties of infinite growth types do not have to be picked. The toppings should be carried out 30-40 days before the seedlings are pulled, and it is advisable to choose a sunny morning. After heartbreaking, cherry tomato plants are prone to side branches and should be tapped in time.
5. Go to the old leaves
Cherry tomato growth to the middle and late stages, the branches are leafy, the ventilation between plants is getting worse and worse, then the yellow leaves, old leaves and diseased leaves below the harvested fruit spikes should be removed to facilitate ventilation and light transmission and reduce the incidence. Don't go to the old leaves too early and don't do too much, as long as the leaves are green, you can also photosynthesis try not to remove. The leaves in the upper part of the ear should not be removed, on the one hand, it can create nutrients, on the other hand, it can also block the sun and avoid sunburning the fruit. Old leaves, like beatings, should be performed on sunny mornings to facilitate wound healing and to remove the lower leaves of the panicle as harvested. The yellow leaves, old leaves and diseased leaves removed should be removed from the field in time and destroyed uniformly, so as not to pollute the field and cause disease and insect infection. After these agricultural operations, it is recommended to spray protective fungicides in time to prevent diseases
Fourth, cherry tomatoes are the main insect pests
1. Aphids
Aphids, also known as greasy worms and honey worms, are spread all over the country. Flocks gather on the back and tip of the cherry tomato leaf to suck up sap and secrete honeydew, which affects photosynthesis and makes it severely malnourished, causing leaf crumpling and leaf yellowing, making it difficult to grow normally. In addition, aphids can also transmit cucumber mosaic virus and potato Y virus, causing the occurrence of cherry tomato virus disease, causing far more harm than the aphids themselves.
Prevention and control methods: Comprehensive control measures should be adopted, adhere to the principle of prevention-oriented prevention, and control aphids in the stage of spotting. (1) Agricultural control: select aphid-resistant varieties; clean the countryside in time after crop harvesting. (2) Physical control: yellow or orange plastic board, cardboard, etc. are coated with orange-yellow paint, and then coated with No. 4-5 motor oil, hung on the top of the row, 30-40 pieces per acre, reapplyed every 7-10 days to trap the winged aphids; or colonized furrows are covered with silver-gray mulch film, and the silver-gray film is hung horizontally to avoid aphids. (3) Biological control: Artificially raised or assisted aphids, natural enemies ladybirds and grasshoppers, etc., released into the field, can effectively inhibit the number of aphids. (4) Pharmaceutical control: 10% imidacloprid wettable powder 3000 times liquid; or 10% aphid net wettable powder 2500-3000 times liquid; or 10% cypermethrin emulsion 2000 times liquid. Spray every 7 days, 3-4 times.
2. Spotted diving flies
American spotted flycatcher is an increasingly harmful insect pest in cherry tomato production in recent years. Adults use an egg layer to suck up sap, and the larvae sneak into the leaf or petiole to eat the leaf flesh, forming a curved white tunnel under the epidermis, making the leaf flesh tunnel-like, causing the leaves to be seriously dehydrated, yellowing and even dying.
Prevention and control methods: reasonable arrangement of stubble, crop planting in turn between food-loving and non-food-loving crops; timely cleaning of the countryside; taking advantage of its yellowing, hanging yellow plates in the field to trap american spotted diving flies. Pharmaceutical control: scientific use of medicine, sporadic discovery, remove the insect leaves and bury them, and then spray, the spraying should be carried out when the pest road is less than 2 cm. In the morning or evening, a series of sprays are used, sprayed every 7 days, and the medication is rotated to delay the resistance of pests to various pesticides. Insecticides with aspirate and touch killing effects are selected, such as 1.8% avermectin emulsion 2000-3000 times liquid, or 40% fly maggot net emulsion 2000 times liquid, or 2.5% kung fu emulsion 1000 times liquid.
Fifth, cherry tomatoes are the main diseases
1. Cataplexy
One of the important diseases of cherry tomato seedlings, mainly harming seedlings or causing rotten seeds. After the seedlings are unearthed to 3-4 true leaves, yellow-brown water-stained spots appear near the surface of the soil at the base of the young stems, and as the disease progresses, the spots wrap around the neck, and finally shrink into a line, the cotyledons and young leaves do not wither, and the seedlings fall to the ground and die. If the germ is damaged, it causes rotten seeds.
Prevention and control methods: (1) Seed disinfection: seeds can be soaked in warm soup or mixed with medicinal agents. Seed mix with 0.3% of seed weight 72% cream urea manganese zinc wettable powder or 69% Anker zinc manganese wettable powder. (2) Strengthen seedbed management: select the field with high and dry terrain, good drainage, fertilizer and no disease as the seedbed, and disinfect the bed soil (mix the soil with 50% carbendazim or 40% pentachloronitrobenzene, 8-10 grams per square meter); the planting density should not be too dense; the diseased plants are found to be removed in time. (3) Pharmaceutical control: spray with 300 times the liquid of potassium dihydrogen phosphate plus 72.2% Pulik 600 times liquid level, or with 70% daisen manganese zinc 500 times liquid, or with 64% alum 500 times liquid, or with 75% bacillus 600 times liquid. Spray every 7-10 days, 2-3 sprays continuously.
2. Standing blight
Commonly known as "mold root", it is one of the common diseases in the cherry tomato seedling stage. Many harmful seedlings are in the middle and late stages, and in severe cases, they can become dead seedlings. First produce round or oval dark brown spots at the base of the stem, the spots are obviously concave, the seedlings wilt and fall during the day, recover at night, and as the spots expand around the stem, the diseased part shrinks, the wilt is no longer restored, and the seedlings gradually dry up and die.
Prevention and control method: same as "cataplexy".
3. Green blight
Also known as bacterial blight, it has become a devastating disease in the Yangtze River Basin and the areas south of the Yangtze River, especially in Hainan, Guangdong, Guangxi, Fujian and other provinces. The disease is infected at the seedling stage, but does not show symptoms at the seedling stage, and does not appear until the early stage of the results. The first upper leaves begin to wilt, then the lower leaves, and finally the middle leaves wither, the whole plant wilts during the day and recovers at night, 3-7 days of death, the whole plant is still green. Cutting the stem can see the vascular bundle turn brown, and squeezing the incision with hand can see the milky white bacteria fluid oozing out. In severe cases, the medulla becomes brown and decays, becoming hollow, which distinguishes it from blight.
Prevention and control methods: selection of disease-resistant varieties; implementation of crop rotation; strengthen field management, more application of organic fertilizer or grass and wood ash; timely removal of diseased plants, and disinfection with quicklime. Pharmaceutical control: irrigation of roots with 72% agricultural streptomycin sulfate wettable powder 4000 times liquid, or 50% diquat double wettable powder 800-1000 times liquid irrigation, or 77% killable wettable powder 400-500 times liquid, 50% succinate fertilizer copper wettable powder 400 times liquid root irrigation. 0.3-0.5 liters of irrigation solution per plant, irrigated every 7-10 days, 2-3 times continuously.
4. Blight
Cherry tomato blight, also known as wilt disease, is a vascular infection disease. It occurs predominantly during the flowering and fruiting phases. In the beginning, only the leaves of the lower part of the plant turn yellow, and then wither and die, not falling off. As the disease worsens, the diseased leaves gradually turn yellow, brown and necrotic from bottom to top. Sometimes the diseased plant is on only one side, leading to normal growth on one side. On sunny days, the plant wilts and can recover sooner or later. The roots of the diseased plant turn brown, the vascular bundles are yellowish brown at the base of the incised stem, and the surface of the lesions is covered with pink mold layers when the humidity is high. Cut open the diseased stem and squeeze, no milky white mucus flowing out, can be distinguished from green blight.
Prevention and control methods: select disease-resistant seeds; strictly implement crop rotation and stubble; strengthen cultivation management, avoid flood irrigation, and avoid hurting roots. Pharmaceutical control: When a small number of diseased strains are found, use 500 times the liquid of 50% carbendazim wettable powder, or 90% of the water agent of 90% xanthoprim 1000 times liquid, or 50% methyl tolbuzin wettable powder 400 times liquid irrigation, 100 ml of liquid per plant, watered every 7-10 days, and irrigated 3-4 times. Grafting and root replacement measures can be used in severely ill areas.
5. Early blight
Also known as rotunda, the leaves, stems and fruits can be diseased. The leaves are initially water-stained dark brown spots, enlarged round or oval, up to 1-3 cassettes in diameter, dark brown at the edges, dark brown in the center, yellow-green halos at the edges, with obvious concentric rings in the middle, black mold grows on the spots when the humidity is high, and sometimes ruptures in the middle of the spots in the later stages. After the stem infection, the spots are mostly in the branches, gray-brown, nearly oval, slightly concave, so the texture is not obvious, and when severe, it can cause branch breakage. The fruit is damaged, mostly in the place where there is a crack near the fruit pedicle, brown or black brown, slightly concave, concentric striations, the diseased part is hard, the top is densely covered with black mold layer, and the diseased fruit is easy to crack in the later stage, and it becomes red early.
Prevention and control methods: select disease-resistant seeds, carry out seed disinfection; strictly implement crop rotation and stubble; strengthen cultivation management, and remove diseased leaves from diseased plants in time. Pharmaceutical control: At the beginning of the disease, spray with 50% parahetine wettable powder 1000-1500 times liquid, or 50% carbendazim wettable powder 500 times liquid, or 80% daisen manganese zinc 500 times liquid, or 40% mycoleptic plus 40% sterilized Dan (1:1) 1000 times liquid. Spray every 7-10 days, 3-4 times.
6. Late blight
Cherry tomato late blight is also called blight. In the cold, cold, rainy and high humidity situation, the fierce, rapid development, 3-4 days can make the whole field a black wither, on the verge of harvest, seedling stage, adult plant stage can be diseased, to leaves and green fruits the most harmful. At the seedling stage, the disease spots spread from the leaves to the main stem, the petiole and stem lesions become black-brown, rotting, and the plants are folded and dead. The leaves mostly start from the lower part, produce large brown water-soaked patches at the tip or leaf margin, and when the humidity is high, the spots quickly expand to half-leaf or the whole leaf, and the edges of the spots grow white mold layers, and the spots are blue-white after drying, brittle and easy to break. The lesions on the stems are black and decaying, and the plants are prone to wilting or breaking. When the fruit is onset, the fruit painting appears large brown moiform spots, and when the humidity is large, there is sparse white mold on the edge of the spots, and the fruit is not soft at the beginning, and it softens and decays in the later stage.
Prevention and control methods: selection of disease-resistant varieties; implementation of crop rotation; strengthen field management, avoid flood irrigation, increase the application of phosphorus, potassium, micro-package fertilizers Jiamenei potassium, Jiamei profit; early detection and early treatment. Pharmaceutical prevention: In the initial stage of disease prevention, use 72% gram 600 times liquid, or 72.2% Plick 600 times liquid, or 69% Anker manganese zinc 700 times liquid, or 25% venom mold (methyl cream) wettable powder 600-800 times liquid, or 60% alum wettable powder 500 times liquid spray, rotate the drug, spray once a week, and spray 3-4 times depending on the condition.
7. Viral disease
Cherry tomato virus disease is widespread throughout the country and is seriously harmful. There are three common types of flowers and leaves, leaves, and stripes. (1) Flower and leaf type, seedling stage to adult plant stage can be diseased, yellow and green or dark green, light green spots appear on the leaves, the leaf surface is uneven and slightly wrinkled, the new leaves become smaller, the stem growth is slow or stagnant, the flowers fall fruit, the fruit is not easy to grow, the fruit is unevenly colored, and a large number of macula appear. (2) Leaf type, the plant appears to be dwarfed to varying degrees, starting from the upper leaves to become all or part of the line, the leaf veins are purple, and the middle and lower leaves are rolled into a barrel. The plants are dwarfed and grow in small clusters. The corolla is enlarged and enlarged, forming a huge deformed flower, the diseased fruit is deformed, and the fruit heart becomes brown. Fruit setting is rare, and it is difficult to grow and mature after fruit setting. (3) Stripe type, leaf yellowing, leaf vein necrosis, initially manifested as dark green depression short stripes, later become dark brown concave necrotic stripe spots, and finally the plant wilts and withers. The fruit is deformed, with brown patches of different shapes on it, and the spots are only on the surface of the fruit, not deep inside the fruit.
Control methods: selection of disease-resistant varieties; implementation of crop rotation; cultivation of strong seedlings; strengthen field management, timely removal of diseased strains, non-toxic agricultural operations, timely control of aphids and white planthoppers and other poisonous insects. Pharmaceutical prevention and control: Spray 1.5% phyto-disease emulsion 1000 times liquid, or 5% bacteriotoxic 300 times liquid, or 20% virus A wettable powder 500 times liquid, or antivironant 1 200-300 times liquid, the number of sprays depends on the condition, generally every 7-10 days, spray 2-3 times.
8. Root-knot nematode disease
The disease is typically characterized by the production of many nodular root knots of varying sizes on the roots and lateral roots of the diseased plant, and small milky nematodes can be seen by dissecting the root knots. At the seedling stage, the growth is hindered, the dwarf turns yellow, and it cannot be colonized. Adult plants have poor growth and development, short stature, premature aging, midday wilting, morning and evening recovery, and in severe cases, due to huge tumors in the roots, the root function is destroyed, resulting in plant lack of water and death.
Prevention and control methods: select disease-resistant varieties, rational crop rotation, soil and shed disinfection. Pharmaceutical control: soil disinfection with chlorinated bitter, 100 grams per square meter. During colonization, 10% thiazole phosphorus granules were applied to each mu of hole. After colonization of slow seedlings, the roots can be irrigated with 10% octyl thiophos 1500 times liquid or 40% chlorpyrifos 1000 times liquid.
This article was edited and collated by cathay pacific's technical team
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Source: Tianbao Agricultural Technology Service Platform (ID:zhxdnyjs)