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Anonymous users2024-02-08It may be a persimmon velvet scale infestation.
Prevention and control measures: 1In early winter, spray the trunk with 3 5 Baumé stone sulfur mixture.
2.Spray Baumé stone sulfur mixture at the nymph stage, or spray 1 000 times of 40% dimethoate EC or 800 times of 50% malathion at the beginning of each generation of larvae.
3.Pay attention to the protection and utilization of natural enemies, avoid spraying in the peak period of fruit setting and natural enemies, and spray pesticides should be mainly low-toxicity pesticides when spraying for prevention and control.
4.Biological control: The dorsal plate of the prothorax is black, and there are a pair of red spots on the black elytra, and the spots in the front are larger than those in the back. It preys on a variety of scale insects such as persimmon mealybug and new scale [2].
5.The occurrence of persimmon scale is closely related to persimmon varieties, and persimmon trees with lush branches, large fruits, juicy and thin skin are more seriously affected. When building a garden, attention should be paid to selecting excellent insect-resistant varieties that are not conducive to the growth of persimmon velvet scale, such as square persimmon, Dahongpao persimmon, etc
Related questions12 answers2024-04-281. Apply sufficient base fertilizer in late September, after the persimmon fruit is harvested, and early October is the fertilization period. The specific amount of fertilizer depends on the strength of the tree, the size of the canopy, the amount of yield, and the level of soil fertility. Generally, 100 kg of organic fertilizer, 1 kg of diammonium phosphate and 1 kg of potassium sulfate are applied to each plant, and the ditch is open and the ditch is 30 cm deep for fertilization. >>>More
5 answers2024-04-28If you are sick, it is recommended to spray the medicine twice at the green fruit stage and once at the ripening stage.
2 answers2024-04-28The persimmon tree is a common fruit tree, and its fruit has a beautiful orange-red color, which is sweet and delicious. It is loved and cultivated by people in many places. The persimmon tree is a small and medium-sized tree, generally around 5-10 meters in height. >>>More
How are persimmon trees grown? Can the seeds eaten from persimmons be planted, and how do you make t8 answers2024-04-28The persimmon tree is planted from seeds.
6 answers2024-04-28Sub-category: Tuesday, 19 June 2007.
Persimmon madness. The leaves of the diseased plant are large, but they are falling and brittle, the leaf surface is uneven, the vascular bundles of the leaf veins become black, and sometimes the black veins can be seen on the surface; The dorsal branches of the main side branches of the diseased tree are long, erect and clustered, and the top is weak and "chicken claw branch". Good control of leafhoppers and other vector insects can slow down the spread of diseases; Strengthen management and cultivate a strong tree; Trunks are drilled and perfused with penicillin. >>>More