Apple powdery mildew is a fungal disease caused by the infestation of white silk monocystic shells. It is an obligate parasite that can only parasitize living host tissue and infect only young tissues. Therefore, the occurrence of disease is closely related to the development status of the host tissue.
The bacteria lived in winter bud scales or dormancy within the scales with dormant hyphae. Sprout buds germinate later in the spring of the year. When the winter buds are open, the wintering hyphae begin to move, resulting in conidial infestation and becoming the epicenter of the disease. Conidia spread through the air stream and continue to re-infect. April-September is the period of disease occurrence, in which the temperature is low in April-May and the shoot tissue is tender. This is the peak of powdery mildew. When young shoots appear in the autumn shoots, the peak of the second incidence begins.
Prevention and control measures 1) Powdery mildew is overwintering in bud scales, which is mainly composed of apical buds and bacteria, and the amount of autumn shoots is higher than that of spring shoots. Therefore, disease shoots, disease shoots, and diseased leaf bundles are cut after winter, spring, and early spring disease. Concentrated burning or deep burial is the key to reducing bacteria source control disease.
2) The scientific application of cultivation measures such as fertilization and pruning must be highly regarded, so that the park is airy, light-transmitting, robust, and resistant to diseases. 3) Grasp prevention and control during the period of time. Combine with other diseases before germination, spray 5 Baumide Lithosulphide; spray 1 Baume degree lime sulfur at bud stage; spray 25% triadimefon WP or 20% triadimefon EC at early stage of spring Liquid, 12.5% ​​tempuazole 2000 times, 10-20 days, a total of 3-4 times. 4) Use low-volume spray equipment as much as possible to increase control efficiency while reducing the amount of liquid spray.
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