"Red wolfberry fruit", persimmon cotton aphid, is harmful to the twigs, young leaves and fruits of persimmon trees. Nymphs and adults are most likely to cluster under the fruit and cause damage to the joints with the persimmon. At the beginning, the victim was yellow-green dots and gradually expanded into dark spots, which caused the fruits to soften and fall off in advance and reduce the yield and quality.
Prevention:
(1) At the beginning of February, the old skin was scraped off at the base of the trunk and coated with about 10 cm of glue. The insects and nymphs of the upper tree were killed and the dead insects were removed with a brush every day. The results were good. When the female lays its eggs under the tree, it digs around the base of the trunk, puts some leaves and weeds inside, induces insects to lay eggs, and then burns them.
(2) Before the germination of persimmons in the early spring, spray 5 bumeido lime sulfur or 5% diesel emulsion to eliminate overwintering nymphs. From the beginning of April to the beginning of May, the persimmon tree leaves the wintering nymph before its flowering, and it is known that the winter nymph has left the overwintering site, but before the formation of the waxy shell, it is sprayed meticulously and smashed. .
(3) Black-marginal red ladybugs and red-spotted ladybugs have a certain degree of control on the occurrence of persimmon cotton aphid. When a large amount occurs, they should use as few or no broad-spectrum pesticides as possible to avoid killing natural enemies.
(4) Pay attention to the source of scion and do not allow the introduction of scavenger scion. Insect seedlings have to be disinfected before planting.
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