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What are the control methods for the pear bicolor aphid pest?

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This insect, commonly known as the pear aphid, is a major pest of pear trees and is found in all pear-growing regions. After pear trees are infested, large numbers of leaves curl up, causing early defoliation, weakening of tree vigor, and impaired fruit development, seriously affecting yield and quality. [Occurrence pattern] About 10 or more generations occur per year. Overwintering eggs generally hatch in March and late March when pear buds swell and open. After the young aphids grow, they continuously give live birth to new young aphids. By late April, winged aphids begin to appear. During May, winged aphids form in large numbers and migrate to weeds to reproduce and cause damage. In October, winged aphids migrate back to pear trees

This insect, commonly known as the pear aphid, is a major pest of pear trees and is found in all pear-growing regions. After pear trees are infested, large numbers of leaves curl up, causing early defoliation, weakening of tree vigor, and impaired fruit development, seriously affecting yield and quality.

[Occurrence pattern] About 10 or more generations occur per year. Overwintering eggs generally hatch in March and late March when pear buds swell and open. After the young aphids grow, they continuously give live birth to new young aphids. By late April, winged aphids begin to appear. During May, winged aphids form in large numbers and migrate to weeds to reproduce and cause damage. In October, winged aphids migrate back to pear trees to reproduce and cause damage. In November, female winged aphids and male winged aphids are produced, and after mating they lay eggs to overwinter.

[Control methods] (1) Chemical control of the pear aphid should be carried out before pear leaves curl. The period from pear bud swelling and showing white to the early leaf expansion stage is the key period for spraying control. For the chemical, 40% dimethoate emulsion at 2000-fold liquid can be used. If the pear aphid develops resistance to dimethoate, spraying can be switched to 20% fenvalerate-dimethoate emulsion at 2000-fold liquid. In recent years, reports have stated that 2.5% bifenthrin emulsifiable concentrate at 1000-2000-fold liquid and 10% alpha-cypermethrin emulsifiable concentrate at 1500-fold liquid have excellent effects in controlling fruit tree aphids. If combined with disease control, it can be mixed with 50% carbendazim wettable powder at 1000-fold liquid and 50% thiophanate-methyl wettable powder at 800-fold liquid. (2) There are many kinds of natural enemies of the pear aphid, such as ladybugs, green lacewings, hoverflies, and aphid parasitoid wasps. Natural enemies should be fully protected and introduced to suppress pear aphid damage.

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