Prevention and control methods:
(1) In winter, the overwintering larvae can be eliminated by scraping off the wing skin and rough skin on the branches, picking off the remaining persimmon stems, and centralized burning.
(2) In the middle and late June and from mid-August to early September, the harmful fruits of larvae must be removed in time, picked, washed and buried deeply, so as to eliminate the pupae and larvae of that year.
(3) In mid-August, coarse-skinned grass stems were tied to the trunk and main branches to lure the larvae to overwinter in it and burn it completely after winter.
④ At the peak of adult occurrence, use effective Juma EC 1500-2500 times; 20% fenpropathrin EC 2500-3000 times; Or 3,000-5,000 times of 2.5% deltamethrin emulsifiable concentrate; Or 20% fenvalerate emulsifiable concentrate 2500-3000 times; Or 1000 times of 50% chlorpheniramine EC. Good results can be achieved by controlling 1-2 times.
2. Cicada with blood spots
Prevention and control methods:
(1) clear the garden, clean up weeds and fallen leaves under trees, and reduce the source of overwintering insects.
(2) In late May, when the first generation nymph appeared in large numbers after persimmon blossom, 40% dimethoate emulsion can be used for 2000 times, or 50% octane sulfonic acid emulsion 1000 times, and 50% chlorpyrifos emulsion can be used.
③ Protect natural enemy red insect-eating mite.
Extended data:
Principles of persimmon shaping and pruning
1, which meets the characteristics of persimmon trees.
Tangible and immortal, shaped with the tree; The tree potential is balanced, and the master and slave are distinct; Give priority to sparse, restrain the strong and help the weak.
2, suitable for site conditions
The fertile crown is large and evacuated, and the barren crown is small and compact; Slope crown height; In places with insufficient light, the main branches should be thin and the leaf curtain layer should be thin.
3, the tree catches the wind, but trip worthwhile.
Young trees expand the crown and bear fruit early; Results The mother branch was quantitative. Fruit burns when it sees light; As a result, the site is near the main branch.
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