After a variety of pests are harmful to pear leaves, the leaves cannot be unfolded and rolled up, affecting photosynthesis, reducing the yield and quality of the fruit in the current year, affecting the differentiation of flower buds in the current year, and often causing early leaf fall. Such pests mainly include: pear gall mosquitoes, aphids, pear leaf ticks, leaf curl moths and so on.
1. Pear gall mosquitoes
The first is "gall", that is, the bumpy and uneven knots appear in the affected part of the leaf.
The second is the "roll", in which the affected leaf is rolled longitudinally from the leaf edge to the front of the leaf into a tight cylinder, which is close to solid. As the larvae and leaves grow, the number of coils increases, and finally the entire leaf is a bi-barrel shaped with a symmetrical middle main leaf vein, and the larvae are infested in the middle, and the larvae cannot be seen without fully unfolding the rolled leaves.
The third is "brittle", when the curl leaves are unfolded, no matter how careful the leaves will be damaged.
The fourth is "mixing", and the unrolled part of the leaf that is infested with pear gall mosquitoes is often mixed with pear dipterophyllus and pear wood lice.
2. Aphids
There are two species of aphids that infest pear leaves and cause curly leaves, namely pear dipterophyllum and meadowsweet aphid, of which pear diptera is more closely related to the symptoms of pear gall mosquitoes. The pear dipter is infested on the front of the leaf, and the damaged leaf is rolled into a barrel shape to the front. This kind of tube is just a hollow tube with the leaf edge folded towards the leaf face, and the entire blade is similar to a single tube. Compared with the symptoms of the pear gall mosquito, the leaves do not have knots, the leaves are not brittle, and the aphids can be seen by gently spreading them with the hands.
Meadowsweets are infested on the back of the leaves, and the damaged leaves are rolled sideways to the back.
3. Pear leaf tick
After harming the pear leaf, the leaf margin appears hypertrophic, the leaf back is swollen and wrinkled, and the leaf edge is longitudinally rolled towards the front of the leaf, which is severely rolled into a double cylinder. Compared with the duplex of The Pear Glove mosquito, this binocular is empty and is not rolled into multiple layers.
4. Leaf curl moth
Apple leaf curl moth is apple leaf-like
The capsular leaf curl moth is infested with apple shoots
The main pests of leaf curl moths that can harm pear leaves are: apple leaf curl moth, macular long-winged leaf curl moth, top leaf curl moth, top leaf curl moth, pear leaf moth and so on. After these pests infest the pear leaves, the leaves do not really roll up the leaves, but fold the leaves through the spit silk, the white silk and larvae are easily visible, and the gaps or holes that the larvae can eat can be seen on the leaves.
Apple leaf curl moth larvae and apple leaf curl moth larvae: usually spit silk to connect 2 to 3 leaves together to form buds, and eat leaf flesh in it. Larvae of the macular long-winged leaf curl moth: roll the entire leaf cluster into clumps or leaf veins longitudinally. Top-tip leaf curling moth larvae: Several leaves at the tip of the new shoot are rolled together and spit silk into an insect chamber, which lurks in it. Pear leaf moth (Pear Star Caterpillar) larvae: Spit silk wraps the edges of the leaves into a dumpling shape and feeds on them.