Harmful characteristics and control of jujube inchworm

1. What are the harmful characteristics and living habits of jujube inchworm?

Jujube inchworm, also known as Toxoplasma gondii, top door eating or jujube step qu. The larva stretches a curve when crawling, so it is called "jujube step", which is one of the most important insect pests of jujube tree. It is distributed in all the major jujube areas in China, especially in Hebei, Shandong, Henan and Shanxi provinces. The larvae have a strong overeating habit, which harms all the green tissues such as buds, leaves, buds, jujube hanging and new branches of jujube trees. When it is serious, it can eat all the jujube leaves or buds, resulting in a serious reduction in yield or no harvest.

In North China, jujube inchworm occurs once a year and feathers from March to April every year. The male adult has wings and can fly; the female adult does not have wings and lurks in the weeds under the tree after Eclosion. In the evening or night, it climbs the tree to mate with the male, and then lays eggs in buds and bark cracks. The eggs hatched around the middle of April. The hatched larvae begin to cluster at the top of the treetops to harm the buds, so people in the jujube area call it pupation. The larvae crawl fast and have the characteristic of spinning and drooping from the tree after being frightened, which can spread and transfer in all directions. Therefore, when the leaves of a jujube tree are eaten by them, they can spin silk and fall to the ground and transfer to other jujube trees.

In addition, there are "jujube silver inchworm", "Robinia pseudoacacia inchworm", "mulberry fold wing inchworm" and "sour jujube inchworm" which are harmful to jujube trees. Their living habits and harmful rules are roughly the same as those of jujube inchworm.

Second, what are the measures for comprehensive control of jujube inchworm?

In order to carry out comprehensive control of jujube inchworm, the following main measures can be taken:

1. Dig the overwintering pupae and capture the larvae in spring (before mid-March). Dig up the soil layer and dig out the overwintering pupae within the diameter of 100 cm around the trunk. It can also be combined with early winter or early spring planing to pick out its pupa at any time. In addition, the characteristics of false death and landing of the larvae after being frightened can be used to shake the trees and shake down the larvae in the larval damage period and kill them on the spot.

2. Stop the female moth from going to the tree and collect the eggs. Because the female can't fly, she can wrap plastic film or paper skirt on the tree trunk in the middle or late March to prevent the female moth from mating and laying eggs, and catch the moth from tree to tree every morning or evening. Whether it is a paper skirt or a plastic film wrapped around the tree trunk, the riding seam must be nailed up without leaving a gap, so that the female insect will not be able to climb the tree by taking advantage of the gap. Because the trunk is wrapped around the skirt, the female moth cannot go up the tree, so she will mostly concentrate on the bark seams under the skirt to lay eggs. Therefore, you can regularly pry open the thick bark, scrape off the eggs, or tie two circles of grass rope under the skirt to trap the female moth to lay eggs, change the grass rope every 10 days or so, and burn it. You can also bury the lower part of the plastic skirt in the soil at the base of the tree trunk, directly stop the moth from climbing the tree, and catch the moth on the ground around the tree every morning or evening. Or scrape off the trunk directly and apply a circle of sticky glue 10 centimeters wide. If there is no sticky glue, you can also apply oil instead. So that the female can be glued directly to the tree trunk and then killed.

3. Drug control can be divided into two times according to the characteristics and harm law of jujube inchworm. For the first time, when the jujube bud grows to about 3 cm (the time is early May), 50% dichlorvos or 75% phoxim can be sprayed with 1000 times, or 50% parathion 1000 / 1500 times. In the second time, when the jujube bud grew to 5ml 8cm (mid-May), 20% Chrysanthemum Horse EC 4000 times, or 35% insecticidal phosphorus EC 1000 times, or 35% tetramethyl thiocarbophos EC 1500 times, or 50% monocrotophos 1000 times, methomide and Uranus 3000 times, 2.5% deltamethrin 1500 times, or 20% monocrotophos 6000 times, etc.