Pear Shrink
Pear leaf atrophy, also known as pear leaf shrinking, shrinking leaf disease, etc., is a blind eye, thin lice family. Distribution in the country is very common, Hebei Province, Henan Province, Shandong Province, Shanxi Province, Shaanxi Province and other provinces have occurred in the pear area, and some areas are seriously damaged. In order to form a cochlea and Ruoqiang, ten pieces of flowers and flowers were damaged. The damaged leaves were first proliferated in Jiaobei Mountain, and the leaves shrank and curled along the edge of the leaf to form a convex and concave surface. Leaf swelling and shrinkage. The back of the leaf is spongy, affecting photosynthesis, losing water and dried up, and the flower is damaged and cannot be set aside.
The morphological features of the worms are tiny and not easily visible to the naked eye. They are about 130 microns in length and 49 microns in size. They resemble carrots. The front end is thick and backward, and the oil is yellow and translucent. Tail 2 long bristles. Eggs are small, round and translucent. Larvae like adults. Small and slender body, yellowish white.
The history of life and habits of P. syringae larvae occured for multiple generations in one year. The adult larvae were overwintered under the bud scales and found under the skin of the branches and under the weight shedding layer. When the pear buds began to bloom, they moved to young tissues to feed on them. In May, the damage was most serious, and the number of them was gradually reduced. The wounded leaves and wrinkled leaves were difficult to stretch. Fall into the bud into the bud and potential?
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Control methods
1 Early spring pears before germination. When flower buds begin to expand, the spraying of stone sulfur is very good and the control effect is very good.
2 It was found that there were shrunken leaves and wrinkled leaves, which were promptly removed, concentrated and eliminated to prevent spread.
(3) Leaf spray slag mixture, or 15% Ba Fuling 2000-3000 times liquid, etc., can achieve better results.
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