Myclobutanil can be used to control apple powdery mildew

Apple powdery mildew mainly affects young shoots and leaves, and can also damage young flowers and buds. The main symptom is that a layer of white powder is produced on the surface of the affected part. The onset of new shoots is caused by the germination of the diseased shoots. The surface of the young leaves and shoots is covered with a layer of white powder. The joints of the shoots are short and thin. The leaves on the shoots are long and narrow, the leaves are curled up, twisted and deformed, and the texture is hard and brittle. The shoot stops growing, and the diseased leaves on the diseased shoots and shoots produce dead spots, and the leaves gradually brown and die, or even fall off, forming a dryness.
Under suitable conditions, many black burrs can be produced on the surface of the dry sputum in autumn. Leaves that are damaged after spreading the leaves produce nearly round white powder spots, which are often wrinkled and twisted. In severe cases, the whole leaf is covered with a white powder layer. The diseased leaves are easy to dry and fall off. The flower is damaged, the flower buds and the flower stalk are twisted, the petals are slender and thin, the disease always produces white powder, and the diseased flowers rarely take fruit. When the young fruit is sick, more lesions are produced in the depression, the lesion is covered with white powder, and the epidermis is brown in the later stage.
Pathogen and pathogenesis
Apple powdery mildew is a fungal disease , the pathogen is a single-shell shell of the fork, and the white powder on the surface of the lesion is a large number of spores of the pathogen. The pathogen mainly overwinters in the diseased bud. In the second year, the bud sprouts to form a diseased shoot, which produces a large number of pathogen spores and becomes a source of initial invasion. The pathogen spreads by airflow, and infects young leaves and young fruits from the pores. Powdery mildew mainly infects young leaves, and there are two peaks in the year, which coincide with the growth period of new shoots, but the incidence of spring shoots is heavier.
Powdery mildew is like wet water, warm and dry in spring, cool and rainy in summer, and sunny in autumn, which is conducive to the occurrence and prevalence of diseases; continuous rain will inhibit the occurrence of powdery mildew. It is generally heavier in humid conditions in dry years. The orchard is biased with nitrogen or potassium fertilizer, planted too densely, soil is sticky, and excessive water is seriously affected.
Control technology
(1) Strengthen the management of orchard using formula fertilization technology, increase the application of organic fertilizer, avoid partial application of nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer; rationally close planting, timely pruning, control and irrigation, and create environmental conditions that are not conducive to disease occurrence.
(2) Cut off the diseased shoots in the orchard with serious disease in time, cut off the diseased shoots before and after flowering, and concentrate on deep burial or destruction. It should be pointed out that when cutting the diseased tip, the diseased tip should be placed in a plastic bag in time to prevent the spread of the bacteria in the garden and to be buried or destroyed in time.
(3) Pesticide fungicides can effectively control the disease by spraying one time before flowering and after flowering after germination; serious orchards should be sprayed once again 10-15 days after flowering. Commonly used effective agents are: 12.5% ​​myclobutanol wettable powder 1500 times solution, 25% Jinlix cream 5,000 times, 15% triazolone wettable powder 1000 times. Especially serious orchard, spraying the above-mentioned medicaments 1-2 times in the autumn shoot growth period, can completely control the damage of powdery mildew. Adding 3000-4000 times of soft water to each dose can significantly increase the control effect.

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