In late autumn, the phenomenon of apple tree flowering is called secondary flowering. The main cause of secondary flowering is the combined effect of pests and diseases and environmental conditions, resulting in the early fall off of the old leaves, reducing the synthesis of the substance to inhibit germination - ethephon content, so that hormones lose relative balance. The flowers that are used for the second time do not result in normal results, and they are a waste of nutrition. The weak ones are debilitated, and those who are severely suffer from reduced or absolute production in the coming year.
The first is the control of red spiders and leaf miners. On the basis of strengthening prevention, there are 2 to 3 red spiders per leaf, and 5 leaf miners per lobe should be sprayed.
The second is to prevent and treat spotted deciduous disease, ringworm disease and brown spot disease. In the years with more rainfall, the incidence was heavier, and it was found that pesticides should be promptly sprayed and prevented after sporadic lesions were found on the leaves.
Third, damage to crops, wet damage, and excessive drought can also cause early fall of leaves. Management should be able to drain water, drought can water, so that the maximum water holding capacity in the field to maintain at about 60%.
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