Pests that cause leaf curling on pear trees include the pear leaf gall midge, the pear aphid and the pear rust tick.
1. Pear aphid
Harmful characteristics: The damaged leaves are rolled inward from both sides of the main vein into a pine tube shape. In severe cases, they cause leaf fall and weaken the tree's vigor, which affects the fruit and flower bud differentiation of the year.
Prevention method:
1. Remove the damaged leaves, burn them or bury them deeply; in areas where natural enemies are stocked, ladybirds and lacewings can be placed to protect hoverflies, hoverflies and other natural enemies.
2. Early spring pear buds can be sprayed before they bloom to the stage of germination and development: 50% pymetrozine EC 3000～5000 times liquid, or 10% acetamiprid 4000～6000 times liquid, or 25% thiamethoxam water dispersible granules 2000 times liquid.
2. Pear leaf gall midge
Hazard characteristics:
The initial symptoms of damage are similar to those of Pear aphid. The damaged leaves gradually turn green, finally turn black and fall off, and are bald in severe cases. The flower buds of the injured pear trees are poorly differentiated and generally do not bear fruit the following year.
Prevention method:
1. Before the early winter frost, turn the topsoil under the canopy 10 to 15 cm deep to freeze the overwintering larvae, and spray Baume 5 degree lime sulfur mixture before the buds sprout. During the growth period of spring and summer shoots, cut off the leaves damaged by the larvae in time and burn them together to reduce the source of insects.
2. In the spring shoot and summer shoot extraction period, carry out chemical control, poisonously kill the egg-laying adults and newly hatched larvae, and absorb the strong osmotic insecticide and stomach poison insecticide compound effect. Optional agents are: 40% paracetamol EC 1000 times liquid + 1.8% abamectin EC 1000 times liquid.
3. Pear iron tick
Hazard characteristics:
The leaves curl downwards, become smaller, and become brittle, and the entire tree tops are silver-gray. Finally, the injured leaves fall off, the tree becomes weaker, and the top flower buds cannot be differentiated.
Prevention method:
1. Clear the garden in winter and spring to eliminate overwintering adults.
After the end of 2.5 months, if individual shoots are found to be damaged or discolored, they should be sprayed immediately for prevention and treatment. Acaricides such as pyridaben, pyridaben, and Biomax can be used. Control 2 to 3 times, the effect is obvious. You can add 0.3% urea (unfruited young trees) or 0.3% potassium dihydrogen phosphate (fruiting trees), or other foliar fertilizers when spraying.
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