In a pear tree garden, it was found that there were many small insects scattered on the leaves, and when I walked in and looked closely, the insects curled and attached to the leaves motionless. Looking at the leaves again, many of the edges of the leaves are mutilated by insects. Some of the young shoots are still broken, and the phenomenon of wilting appears. At this time, the pear tree is in the stage of young fruit expansion, and it is necessary for the leaves to provide nutrients through photosynthesis, if the leaves are eaten by this insect, it will presumably affect the normal growth and development of the fruit.
The insect curls adhere to the leaves, the large ones are nearly 1 cm long, and the small ones are half a cm long, and they are yellowish-blue. There are two pale earthy yellow lines on the back, with white powder attached and black spots between the abdominal segments. The head is black and semi-circular. 3 pairs of pectoral feet and 8 pairs of gastropods are born on the second to eighth and tenth segments of the abdomen. We generally see pests that can harm the leaves of fruit trees, mostly stretching their bodies to move on the leaves, and this insect is more special, standing still on the leaves, bending sideways to attach to the leaves.
For most people, it is not known what this worm is. In the countryside, we see countless insects, most of which we can't name. For this kind of bug, there must be many people who do not know what it is. This insect is actually the larvae of the pear macrophylla, and like the larvae of many other moths, it will be very harmful to crops in the larval stage.
Pear macrophylla bees, whether they are larvae or adults, will cause harm to fruit trees, larvae nibble on leaves, adults bite tender slightly, suck sap, will cause leaves to mutilate and fall off, tender slightly broken and withered. Fruit trees such as pear trees, cherries, hawthorns, etc., are all targets of pests of pear large-leaf bees. Although the affected fruit trees will not die in their entirety, they will affect the normal growth and development of the tree and fruit. Therefore, if larvae are found to be infested, it must be controlled immediately, which is both easy and good for the expansion and growth of the fruit.
In fact, although the prevention and control is relatively easy, it is not the best time to prevent and control. In general, the best time to control fruit tree insect pests is during the winter period. Presumably, for other pests, the pear macrophyllum is relatively easy to control, because the pear macrophyllum occurs only once a year. Spring arrives and temperatures rise, and the old larvae that overwinter in the mud pupate and then feather into adults in April.
Adults are a bit like wasps, with a thick, reddish-brown body. After the adult insects begin to move, they will be a little bit tender on the pear tree, sucking juice and biting the leaves, biting the tender slightly, so that the newly pumped tender is slightly broken and withered. Because its flight ability is particularly strong, if there are a large number of adult insects in the whole pear tree garden, the scope of the pest will be relatively wide, and the tenderness of the entire pear tree can be almost all harmed, which is more difficult to control.
After the pear large-leaved bee pupates into adult pupaes, they will lay eggs after nibbling on the tender pear tree for a few days. The eggs are laid under the epidermis near the petiole of the pear leaf leaf, and usually one egg per leaf. An adult female pear macrophylla can lay dozens of eggs. After a week, the eggs begin to hatch, and the hatched larvae begin to nibble on the leaves, continuing to harm the leaves. After the larvae bite off or wither the petiole of the pear leaf leaves, they will fall to the ground with the leaves, and then find a suitable place to enter the soil and cocoon for more summer and winter.
Judging from the activity law of pear macrophylla bees, although it is not the best control season, because the larvae are attached to the leaves, they can be found in time, and it is still relatively easy to control. Generally speaking, in order to prevent and control the pear macrophylla, the following measures can be taken to prevent and control it:
A manual hunting. This season is when the pear macrophylla is active, and we can pull a net in the pear tree garden to hunt, or use a trap to hunt. In addition to trapping adults, because a considerable part of the larvae have hatched and attached to the leaves, we must eliminate the larvae at this time, if the number is not large, only sporadic occurrence, the larvae can be caught from the leaves and concentrated on extermination.
B Turn the soil to extinguish the cocoon. After a while, the larvae will fall from the leaves and enter the soil to form cocoons for more summer and winter. In addition to killing adults and larvae, we must also clean up the orchards in time, clean up the fallen leaves, weeds, dead branches, etc. and burn them in a concentrated manner, and then turn the soil deeply to destroy the larvae that have entered the soil and become cocooned.
C Spray control. If we kill the cocoon by artificial hunting and turning the soil, we can basically eliminate most of it, whether it is the damage of adults or larvae to pear trees, it is not a big problem. But to completely eliminate, but also to take the way of spraying pesticides for control, but at this time is the pear tree young fruit expansion period, to eliminate larvae or adults, the required pesticides are some highly toxic pesticides, easy to lead to pesticide residues. Therefore, it is not recommended to spray prevention before fruit picking, we can spray pesticide control after fruit picking, combined with autumn fertilization, winter pruning and garden cleaning, and spray pesticide control after deep soil turning. Of course, because if there is an insect infestation in the pear tree garden, it is not only the pest of the pear giant leaf bee, but we can combine it with other pest control.
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