After the pear is flowered, how to scientifically use medicine to achieve a good effect of comprehensive prevention and control of pear tree diseases? This depends on what disease harm pears are most likely to encounter after the pear is flowering? Then, according to the invasion of the disease, and then accurately select the "right way" agent, symptomatic medicine, in order to fundamentally solve the problem.
Picture 01~02): Pear tree flowering period
In spring, when the flowers of the pear tree are withering and the young pear fruits begin to quietly hang on the branches, you should know that this is a key turning point in the pear tree's growth cycle.
However, at this time, pear trees are also threatened by various diseases with the superposition of vegetative growth and reproductive growth. In order to ensure the healthy growth of pear trees, fruit farmers need to scientifically carry out integrated pest control after the pears have flowered.
So, what kind of medicine should be injected for the first time after the pear blossoms, and how to achieve a good comprehensive prevention and control effect of pear tree diseases in the current period?
In this issue of pictures and texts, Qingjiang Crane will focus on and chat with all of you and teachers about the topic of what medicine should be sprayed after the pear tree flower, I hope you like it and help you, actively forward and share this issue of pictures and texts, and say your different views, so as to facilitate common progress and common improvement.
Picture 03~04): Pear leaf development stage
What diseases will harm pear trees after the pear blossoms?
After the pear tree flowers have withered, the first thing the growers do is to carefully observe the leaves and fruits of the pear tree to identify possible symptoms of disease.
Common post-flowering diseases of pear trees mainly include pear scab, pear rust, pear brown spot, pear black spot, pear powdery mildew, pear brown rot, etc. These diseases not only affect the normal growth and development of pear trees, but may also lead to reduced pear fruit yield and quality. Comprehensive prevention efforts are therefore crucial.
Pear rust is the most common fungal disease after flowering, in the pear orchard planting base of Heer High Mountain in Qingjiang, under normal circumstances, within 20 days after the Qingming Festival (April 3 or April 4), it is necessary to use a medicine on pear rust. Otherwise, in years with a lot of precipitation, "rust bubbles" (pathogenic spores) will appear on the pear leaves at the end of April and beginning of May. When the damage is serious, the "yellow-orange" small spots can be found on the young pear fruit and petiole fruit stalk, and the disease spots on the young fruit can cause the deformity of the young fruit and lose the added value of the product.
Picture 05~06): Pear flowering and leaf development stage
Pear scab is also a fungal disease that is focused on and prevented at this stage.
Before and after flowering of the pear tree, as well as before bagging, it is necessary to use the medicine related to pear scab once or in combination. "Diseased shoots" are the main source of infection and expansion center of pear scab in the early stage, so it should be treated once before pear rust before the pear tree spreads leaves (if at this stage, it is rainy for a long time and occupies the time for rust prevention and control, rust prevention should be the main thing).
Pear brown spot, also known as pear leaf spot or pear spot blight, round spot disease, is easy to be ignored by fruit growers. Its early onset time is also in the post-pear leafing stage. Therefore, the post-leaf development period of pear blossom is also the "best time" for the prevention and control of pear brown spot disease. However, pear brown spot does not need special agents to prevent it, and many fungal fungicides can treat this disease at the same time.
Although pear black spot disease is harmful for a long time in the whole growth and development process of pears, in the early pear orchards, as long as there are "environmental conditions" for the onset of pear black spot disease, pear black spot disease will arise spontaneously. The early pear black spot prevention and treatment time is also best selected after the pear germination, before flowering and two-thirds of the flowering or flowering and leaf development period.
Picture 07~08): young fruit stage after pear flowering
Pear brown rot, also known as pear sclerotinia sclerotinia disease, is a common fungal disease on kernel fruits, which is often "marginalized" by people. Because many pesticides are effective against pear brown rot, it has crowded out his position in the prevention and control of fruit farmers. As long as the orchard is symptomatic and the management measures are in place, it is difficult for pear brown rot to have its "living space". In addition, pear brown rot is only a "small episode" in the early orchard of pear, and its prevention and control time focuses on the late growth and development of pear fruit or the storage period, which must be carefully prevented and controlled.
Finally, powdery mildew in pears, this disease is more friendly to new leaves, and often shows symptoms on old leaves. A typical symptom is the presence of a powdery white substance on the leaves of pears. It can seriously affect the photosynthesis of leaves, cause early defoliation of pear trees, decline tree potential, and reduce the yield and quality of pear fruits. However, the agents that can effectively prevent and control pear rust and scab can basically prevent and control pear powdery mildew.
Picture 09~10): young fruit stage after pear blossom
According to the occurrence of the disease, the agent should be reasonably selected for comprehensive control:
In view of the diseases that may occur after the pear tree blooms, fruit farmers should choose pesticides with high efficiency, low toxicity and low residue for comprehensive control of various diseases.
In the first application after pear flowering, it is recommended to use a drug that has a broad-spectrum bactericidal effect and is safe for pear trees. For example, some "triazole" preparations or new biopesticides can not only effectively control a variety of diseases, but also reduce the harm to pear trees and the environment.
After the pear tree is completely flowered or two-thirds of the flowering, 10g/bucket of water with 10% difenoconazole water dispersible granules and 80% carbendazim water dispersible granules 600~800 times, and insecticide 4% avermectin, acetamiprid emulsifiable concentrate 2000~3000 times, and "flower and fruit protection" multi-functional foliar fertilizer multi-compound can be used to prevent early leaf spot, black spot, pear rust and pear scab and other diseases after pear flowering.
Picture 11~12): Early expansion stage of pear
You can also use 15% oxazolone EC 20 ml/bucket of water and 40% flusilazole EC 8000~10000 times, and 25% avermectin spirocontamin EC 2000~3000 times, and "flower and fruit" multi-functional foliar fertilizer multi-compound can be used to prevent early pear spot disease, rust, powdery mildew, scab and aphids and other pests and diseases after pear flowering.
You can also use 8000~10000 times of 40% flusilazole EC and 800~1000 times of 70% mancozeb wettable powder, and 2000~3000 times of 10% cyanofluacetamiprid emulsifiable concentrate, and the combination of stem and leaf treatment can prevent early black spot, leaf swelling, pear rust, pear scab, powdery mildew, ring disease, aphids and other diseases and insects after pear flowering.
You can also use 800~1000 times of 70% thiophanate-methyl wettable powder and 8000~10000 times of 40% flusilazole emulsifiable concentrate, 800~1000 times of 70% mancozeb wettable powder, and 3000~4000 times of insecticide 50% thiazinoneene dipyridoxamin emulsifiable concentrate and multi-functional foliar fertilizer of "flower and fruit protection" multi-functional foliar fertilizer can be treated with stems and leaves.
Picture 13~14): The swelling period of pear fruit
You can also use 15% oxazolimidone EC 20 ml/bucket of water and 25% pyraclostrobin EC 25 ml/bucket of water, and 30% spiro-dinotefurin emulsifiable concentrate 2000~3000 times liquid, and "flower and fruit protection" multi-functional foliar fertilizer multi-compound can be treated with stems and leaves.
Scientific use of drugs to ensure the comprehensive prevention and control effect of diseases:
When using medicines, fruit growers need to follow the principles of scientific medicine. The mixed use can be mixed, and the drugs that cannot be mixed are best used alone or not used in this period, and the drugs can not be confusedly "mixed and matched" to avoid the antagonistic effect and negative drug damage between the drugs.
First of all, it is necessary to dilute the lowest or highest concentration according to the instructions for the use of pesticides (the concentration is determined according to the growth of crops and the environmental conditions of the drug, and it is best to carry out "secondary dilution") and spray to avoid excessive use and pesticide damage.
Picture 15~16): Carry out comprehensive pest control for pears
Secondly, it is necessary to pay attention to the timing of the application and choose to spray it in sunny and windless weather to ensure that the agent can be evenly attached to the leaves and fruits. In order to improve the effect of medication, an appropriate amount of "auxiliary additives" can be added to the mixed agents. For example, silicone, pernitriding ketone, phosphorus-free laundry, etc., to improve the adhesion and permeability of the liquid medicine to ensure the effect of the drug.
In addition, it is also necessary to pay attention to the rotation of drugs to avoid long-term use of the same pesticide leading to disease resistance.
Comprehensive prevention and control can improve the comprehensive control effect of pear diseases in the current period:
In addition to the use of pesticides for control, farmers can also take other comprehensive prevention and control measures to improve the control effect.
For example, we should strengthen orchard management, rationally apply fertilizer and watering to improve the comprehensive disease resistance of pear trees, remove fallen leaves, diseased fruits and other diseases and residues in orchards in a timely manner to reduce the source of disease transmission in orchards, and use biological control methods such as natural enemies to increase orchard biodiversity and form a natural prevention and control system.
Picture 17~18): A pear fruit that grows vigorously and develops
Continue to pay attention to the encounter of pear pests and diseases in the field, and adjust the comprehensive pear disease control strategy in time:
Integrated control of post-flowering diseases in pear trees is an ongoing process. Fruit growers need to pay close attention to the growth and development of pear trees in the field and the occurrence of pests and diseases, and take effective measures to carry out comprehensive pest control in time once the symptoms of the disease are found or the central diseased plant appears, or the disease shows obvious symptoms on the leaves or young fruits.
At the same time, according to weather changes, pear tree growth stage and other factors, timely selection of medication time, adjust the prevention and control strategy of pear comprehensive disease prevention, to ensure the healthy growth and development of pear trees.
Words written at the end:
In summary, pest control after pear flowering is very important in the annual management of pears.
Picture 19~20): Pear fruit in the middle of the expansion stage
Fruit growers need to scientifically select pesticides, use drugs rationally, and adopt appropriate methods for comprehensive prevention and control according to the growth and development of pears and the damage of pests and diseases.
And continue to pay attention to the growth and development of pear trees, and adjust the control strategy in time. Only in this way can we achieve a good effect of comprehensive disease prevention and control, and ensure the healthy growth of pear trees and a good harvest of fruits.
In the process of pear tree management, we should not only pay attention to the prevention and control of diseases, but also pay attention to ecological balance and environmental protection. Through scientific and rational medication and comprehensive prevention and control measures, we can protect the health of pear trees while also protecting the natural environment on which we live.