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How to control the pear yellow gall aphid? A full analysis of effective methods

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The pear yellow gall aphid, also called the pear yellow powder insect, attacks only pears and fruit trees of the genus Pyrus. It is tiny: the adult is 0.7 mm long, bright yellow, and obovate, with short 3-segmented antennae, short black legs, and a long mouthpart that even extends beyond the tip of the abdomen; the egg is even smaller, only 0.3 mm long and pale yellow. Adults and nymphs of the pear yellow gall aphid feed in the calyx basin and stem cavity of the fruit. The damaged area of the fruit surface becomes sunken and then turns black and rots, forming cracked large black scars, which lowers fruit quality and causes the fruit to lose part or all of its commercial value. Manual control

The pear yellow gall aphid, also called the pear yellow powder insect, attacks only pears and fruit trees of the genus Pyrus. It is tiny: the adult is 0.7 mm long, bright yellow, and obovate, with short 3-segmented antennae, short black legs, and a long mouthpart that even extends beyond the tip of the abdomen; the egg is even smaller, only 0.3 mm long and pale yellow. Adults and nymphs of the pear yellow gall aphid feed in the calyx basin and stem cavity of the fruit. The damaged area of the fruit surface becomes sunken and then turns black and rots, forming cracked large black scars, which lowers fruit quality and causes the fruit to lose part or all of its commercial value.

Manual control: before the pear trees bud in early spring, scrape off old bark, clear away attachments on the tree body, and eliminate overwintering eggs. After fruit thinning, bag the fruit in time.

Chemical control: before bagging, thoroughly spray 1 to 2 times with insecticide to prevent aphids from being bagged along with the fruit. If insects are found in the bags after bagging, remove the bags, spray insecticide to kill the insects, and then put on new bags. Optional insecticides include: 10% imidacloprid wettable powder at 3000 to 4000 times dilution, 3% acetamiprid emulsifiable concentrate at 2000 to 2500 times dilution, 48% chlorpyrifos emulsifiable concentrate at 2000 times dilution, 20% fenvalerate emulsifiable concentrate at 3000 times dilution, or 20% fenpropathrin emulsifiable concentrate at 4000 times dilution. For orchards where aphids have already bored into the bags but the damage is relatively light, spray systemic insecticides with strong penetration, such as imidacloprid and acetamiprid, directly at the fruit bags and the nearby branches and leaves for control.

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