Vegetables contain a variety of nutrients, is an indispensable food in our lives, of which the popularity of asparagus is relatively high, it is crisp and refreshing to eat, people are refreshed, is a vegetable that many people love to eat. It is precisely because of the abundance of asparagus that the profits of vegetable farmers have been guaranteed, so the planting range in Our country is very wide, and our country is also the country with the largest area of asparagus. However, if they encounter diseases and insect pests, they will be miserable, and the interests of vegetable farmers will be seriously affected, so no matter what kind of diseases and pests, vegetable farmers must do a good job of prevention and avoid damage to their own interests.
This disease is called asparagus cancer, but you can imagine how severe it is, and in the worst case, it will lead to the loss of vegetable farmers, and the loss is very large. At the beginning of the disease, there are only faded small spots on the main stem 30 cm above the ground, which will become pale cyan or even gray-brown as the disease progresses, and the area will gradually expand. The edge of the spot is reddish brown with small black dots on it, if it encounters drought, the edge will become clearer, if it is rainy weather, the spot spreads faster, and the upper branches will die.
The reason why stem blight is caused is because it is infected with fungi, which is transmitted more quickly when it rains, and the air is also infected, if there is wind, the speed of onset will be faster, so the harm is very serious. It is also related to soil quality and excessive nitrogen fertilizer, which will make the disease more serious. To prevent and control this disease, we must choose good soil, and the most suitable area with high terrain and good drainage is the most suitable. In the application of fertilizer, the use of nitrogen fertilizer should be controlled to avoid excessive growth of asparagus. If a sick plant is found in the field, it should be destroyed immediately. At the beginning of the disease, 70% methyl tolbutazine 800-1000 times liquid, or 50% of the 1000 times solution of daisen ammonium can be used, two or three times continuously, once every 7-10 days.
If asparagus is infected with this disease, there will be spots, red and purple in color, which will occur at the seedling stage, starting from a little higher on the ground, and eventually causing the entire plant to die. If you accidentally break the shoots while picking them, the wound may also become infected, and if it is serious, it will cause the plant to die. If you want to prevent and control this disease, you should take medicine when colonizing, you can use 400-500 times of benzoxine or benzoxine, and first immerse the root in the liquid for 15 minutes before colonization.
After the onset of the disease, the root surface of the asparagus will rot, the root system will also be destroyed, resulting in the main stem yellowing, the entire plant will decay, and the cause of this disease is mainly soil infection, if there is a pathogen in the soil, asparagus will be infected when growing, the method of preventing and controlling this disease is the same as standing blight, but also before colonization, the root system of the asparagus is immersed in the liquid for 15 minutes.
The main harm of this disease is the stem of asparagus, after the onset of the disease will appear spots, the beginning is gray, with the development of the disease gradually become light brown, the shape is somewhat like fusiform, some have no rules, the disease develops to the later stage, there will be some small black spots on the spots. To prevent and control this disease, we must first apply enough base fertilizer, and the disease residue should be removed in time when the sick plant is found. During the onset period, the watering time should be selected in the morning, so as to avoid condensation at night, and at the same time, it is necessary to avoid flooding with large water when watering, and at the same time use 70% DaisenMeng Zinc Wettable Powder 500 times liquid, or 75% Bacillus Clear Wettable Powder 600 times liquid, use two or three times continuously, once every 5-7 days.
At the time of the onset of the disease, a large number of russet disease spots will appear on the branches and leaves of the asparagus, the shape is not very large, but with the development of the disease, the spots will gradually expand, first the middle part will become light brown, then it will become gray, and then there will be a mold layer, and there is a yellow halo on the edge of the spot. The shape is oval at first, but when it is larger, there is no rule. If white mold grows, the plant will decline rapidly, the disease is also very serious, can be spread by air, and will be more serious when the temperature is high.
Since this disease is also caused by fungi, it is also spread by air, so the method of prevention and control is the same as stem blight. The location should be selected well, and at the same time, the garden should be cleaned well before planting, and the sick plants should be treated in time, and the direct deep burial can also be done. At the same time, cover the field with mulch film, pay attention to the use of nitrogen fertilizer when fertilizing, and use 70% methyl tolbutazine 800-1000 times liquid at the beginning of the disease, or 50% of the 1000 times liquid of daisen ammonium, and use the drug two or three times continuously, once every 7-10 days.
In the young stem may be sick, generally appear near the ground, the beginning will first fade, then will become brown, followed by the appearance of black rat fecal sclerotia, the main cause of this disease is infected with fungi, to prevent fungi to choose a high and dry planting environment, while also in the drainage should be good. Usually pay attention to the growth of asparagus, cut off the diseased stem in time and take it out of the field, in addition, control the growth of asparagus, do not use nitrogen fertilizer excessively. Once asparagus is found to be infected with this disease, it can be eliminated by using 70% methyl tolbuzin 800-1000 times liquid, or 1:1:240 Bordeaux liquid, which can be eliminated once every 7-10 days, and two or three consecutive doses.
Nocturnal moth pests are more harmful, they like to come out at night, if they are still larvae, they will directly gnaw on the young branches and young leaves of asparagus, when the pest grows up, the amount of food will increase, and even have the habit of overeating, in addition to gnawing on young branches, young leaves, will also hurt the young stems of asparagus, even the epidermis of old stems is not spared, so it will lead to serious yield reduction. When this insect infestation is found, the adult insects should be booby-trapped in time, and the effect of black light and sweet and sour liquid is good. If the larvae are found to have not dispersed, they can be medicated in time, but if they are old, the insect pests are difficult to eliminate, because their resistance is very strong, so they can only choose to booby trap. If it is an aphid or thrips, it is necessary to sometimes weed and irrigate, and if it is medicated, it can be used 25% chrysanthemum 2000 times liquid or 50% dichlorvos 1000 times liquid.
Any vegetable farmer is not willing to encounter diseases and insect pests, because the consequences of this problem are immeasurable, if the treatment is not good, it is likely to be harvested, so not only waste a lot of effort, the economy will also be seriously lost, so the vegetable farmers who grow asparagus must understand the relevant knowledge, and do a good job of prevention work in advance, so that in the planting process to know how to deal with, will not let their interests be seriously damaged, otherwise they may be found to be untimely and make the plant die.