Apple powdery mildew disease symptoms Apple powdery mildew prevention and control methods, apple powdery mildew is common in China's apple producing areas, in addition to harming apples, but also pear, sand fruit, sea bream, betel nut and mountain stator, etc., on the mountain stator seedlings, The small apples of Penang fruit, sea bream and apples in the brocade, Zhu, Hongyu, Guoguang and other varieties are harmful, let us take a look at the prevention and treatment of apple powdery mildew!
Apple powdery mildew
When spring buds germinate in spring, the overgrowth hyphae produce conidia that are transmitted by airflow. April to September is the period of disease occurrence, and the temperature is low from April to May, which is the peak period of powdery mildew. From June to August, the onset was slow or stagnant. When the autumn shoots sprouted in September, the second incidence peak began.
Warm and dry spring, cool and rainy summer, and sunny autumn are conducive to the occurrence and prevalence of the disease. Continuous rain will inhibit the occurrence of powdery mildew. The planting density is large, the canopy is closed, the ventilation and light transmission are poor, the nitrogen fertilizer is applied, and the delicate orchard is weak. When pruning, the branches do not start, and long-term release, retaining the amount of charcoal overwintering buds, the incidence is heavy.
Apple powdery mildew
- Young shoots: The growth of young shoots is inhibited, and the internodes are shortened. The leaves on the leaves become narrow or not open, hard and brittle, the leaves are rolled up, and the initial surface is covered with white powder, which gradually turns brown. The serious whole shoots died.
- Leaves: The leaves are initially sparsely white, the new leaves are slightly purple, and the wrinkles are deformed. The white powder gradually spreads to the opposite sides of the leaves. The front color of the leaves is uneven, and the white back of the leaves produces white powdery lesions. It is narrow and long, and the edges are wavy or the leaves are uneven. In severe cases, the diseased leaves gradually brown from the tip or leaf edge, and finally the whole leaves dry and fall off.
- Flowers: The apple flower is damaged, white spots are produced at the flower buds or stems, and the bracts and pedicels become deformed. The petals are long and narrow, and the color is pale green. The female and stamen of the victim flower lose their function, cannot be pollinated, and finally die dry.
- Young fruit: The damage of apple young fruit occurs mostly in the vicinity of the cockroach. White powder spots are produced at the cockroaches. The diseased part becomes hard. When the fruit grows, the white powder falls off, forming a reticular rust spot, and the hardened tissue forms a crack or crack at the later stage.
Apple powdery mildew prevention and treatment method
- In winter shearing, the diseased tip should be completely cut off, and the spring and summer should be carefully inspected. The diseased tip should be cut off in time, sealed in a plastic bag, and the orchard should be burned or buried deeply. Reasonable close planting, improve ventilation and light transmission conditions, and reduce the incidence of disease. At the same time, properly control the amount of nitrogen fertilizer application, pay attention to the combination of nitrogen, phosphorus and potassium, and increase the application of phosphorus and potassium fertilizer.
- Before the apple tree is germinated, it is necessary to clear the garden, such as stone sulfur mixture, ceramide, thiophanate-methyl. The first time after the apple flower is exposed and after the flowering, 15% Guoguang triazolone 1000-1500 times liquid or Guoguang Baixiu 1000-1500 times liquid.
- The apple tree buds are combined with other diseases to prevent and cure 5 times of the US sulphur sulphur mixture. The buds are sprayed once with the sulphur sulphur mixture. In the early spring, 25% of the oxazolone WP or 20% of the oxazolone emulsifiable concentrate is sprayed in the spring. Double solution, 12.5% ​​terpazole 2000 times solution, 10 to 20 days once, a total of 3 to 4 times.
- Before the flowering, the young fruit, and the fruit expansion period, the apples are sprayed once, and the nutrient transport conduit is added to increase the nutrient transport volume to improve the fruit expansion and nutrition matching function. , the goal of maintaining fruit, strong fruit, and more fruit.
- Spray 15% powder rusting wettable powder 3000 ~ 5000 times liquid or 15% triazolium WP 1500 ~ 2000 times liquid. If the powdery mildew is serious and the disease rate is 15%, it can be sprayed with 15% rusting 1000-1500 times night or 70% thiophanate 1000 times liquid.
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