How to prevent and control the harm of jujube inchworm to jujube trees

1. Dig the overwintering pupa and catch the larvae In spring (before mid-March), within a diameter of 100 cm around the trunk, turn over the soil layer to dig out the overwintering pupa and eliminate it. It can also be combined with early winter or early spring when pouching trays to pick out their pupae at any time. It can also take advantage of the characteristics of the larvae to fake their death after being frightened, shake the tree and shake off the larvae during the larval damage period, and kill them on the spot.

2. Prevent female moths from going up trees and collecting eggs Since female moths can't fly, they can wrap plastic film or paper skirts around the trunk in mid and late March to prevent female moths from mating and laying eggs on trees, and catch moths from tree to tree every morning or evening. Whether it is wrapped in a paper skirt or wrapped in plastic film around the trunk, it is necessary to nail the seam well, leaving no gaps, so as not to take the female insects to take advantage of the gap to go up the tree, because the trunk is wrapped around the skirt, the female moth can not go up the tree, so it is concentrated in the bark crack under the skirt to lay eggs. Therefore, you can regularly pry open the coarse bark, scrape the eggs, or tie two loops of straw rope under the skirt to lure the female moth to lay eggs, and change the straw rope once every 10 days or so to burn it.

You can also bury the lower part of the plastic skirt in the soil at the base of the tree trunk to directly prevent moths from climbing the tree, and catch moths on the ground around the tree every morning or evening. Or scrape off the trunk and apply a 10 cm wide circle of sticky shellac. If you don't have shellac, you can also apply engine oil instead.

In order to glue the female directly to the trunk of the tree, and then kill it.

3. Drug prevention and control According to the characteristics and hazards of jujube inchworm, it can be divided into two drug prevention and control. For the first time, when the jujube buds grow to about 3 cm long (the time is early May), 50% dichlorvos or 75% phosphine 800 1000 times can be sprayed, or 50% parathion 1000 1500 times can be sprayed. The second time when the jujube buds grow to 5 8 cm (mid-May), you can spray 20% chrysanthemum emulsifiable concentrate 4000 times, or 35% insecticidal phosphorus emulsifiable concentrate 1000 times, or 35% tetramethylthiocyclophos emulsifiable concentrate 1500 times, or 50% monocrotophos 1000 times, 3000 times of methana, Uranus, 1500 times of deltamethrin, or 20% of 6000 times of rapid dichloride. Recommend.

It is also called jujube bud, and the larvae harm the buds, leaves, and flower buds of the jujube tree and spin the silk to wrap the buds and leaves, so that they can not stretch, and the buds and leaves can be eaten up when they are serious, and the yard is good to seriously reduce the yield or no harvest. When the jujube tree germinates and develops its leaves, and most of the larvae enter the second instar, the former mold Zheng sprays 75% phoxanthion 1000 times solution Huisong or 50% dichlorvos 800 times solution or pyrethroid pesticides.

Jujube inchworm larvae eat infiltration rock buds, pure shouting ant leaves into holes and missing carvings, and eat up the leaves when they are strictly buried. You can choose 4000 times of cyhalothrin EC, 3500 times of 20% chloroxatri EC, 4000 times of 50% Rafflin EC, and 1000 times of 50% thiophos EC.

Jujube inchworm: Jujube inchworm, also known as jujube Buqu, belongs to the order Lepidoptera, inchworm family. The host plants include jujube, pear, peach, etc.

Control measures: (1) The orchard is turned over in autumn to kill the pupae, and the larvae are killed by vibrating and falling.

2) Chemical control. In the early stage of larval occurrence, 4000 times of kung fu emulsifiable concentrate, 3500 times of 20% emulsifiable concentrate and 3500 times of enemy emulsifiable concentrate were selected for tree spray control.

Characteristics of damage: take the larvae as the pest buds and leaves, eat them into holes or missing carvings, and eat up the leaves when the Changbei is serious.

Jujube inchworm, belonging to the order Lepidoptera, inchworm moth family.

Jujube inchworm. The insect occurs in all jujube areas in China. In Hebei, Shandong, Henan, Shanxi, and Shaanxi, the five major jujube areas are often rampant.

Mainly take larvae as the pest of jujube tree shoots, leaves, flower buds, and can spin silk entangled, hinder the bud, leaf stretching, serious can eat all the leaves, resulting in serious yield reduction or even no harvest. It is one of the main pests of the leaves of the jujube tree. One generation occurs in one year, and a few two years in one generation.

The old mature larvae spin silk and fall to the ground, and pupate into the soil to overwinter. The pupae are mostly scattered in the soil of the projection area, about 10 cm deep, and the closer to the trunk, the denser they are. It was feathered in March and April of the following year, and some in the northern jujube area were feathered in May.

After emergence, the male moth climbs up the tree and stops in the shade of the main branch. The female moth lurks in the topsoil, to 7 8 o'clock in the evening unearthed on the tree, 8 10 o'clock in the evening is the peak period of mating, half an hour after the tail begins to lay eggs, the eggs are mostly laid in the cracks of the old bark, most of them form a clump, sometimes in a row, individual scattered. The spawning period is 3-7 days.

A female can lay 800 to 1200 eggs. The adult life span is about 7 days, with chemotaxis, feign death, light at night, more quiet during the day due to avoiding light, and male moths are active when it is dark. Male moths are very sensitive to the sex pheromones released by female moths and can go upwind up to 500 meters to mate their tails.

The spawning period is mainly affected by the temperature and is generally about 15-25 days.

The eggs are purple-black before hatching, and the shell is white and translucent, with a shiny finish. When the eggs hatch, the larvae first bite a round hole in the egg shell and eat the bitten debris, and the larvae can crawl and spin silk out of the egg shell, and spread to the surrounding branches by the wind. As the insect grows, it eats jujube leaves and shoots, and even nibbles jujube hangs and jujube flowers.

When jujube leaves are eaten up, they are often transferred to other plants for harm. The larvae are feigned death and may spin and droop when frightened. When the leaves of a jujube tree are eaten, the mature larvae retreat to the main branch, lie in the crevices of the old bark for 2 to 3 days, and then spit silk and fall to the ground, pupate and overwinter.

Prevention and control methods: (1) medicine ring poisoning method, in spring, before the adult emerges, scrape off the old bark in the middle and upper part of the trunk, and tie a plastic film with a width of 8 10 cm. The film is required to be tightly attached to the trunk of the tree, and there is no gap underneath, and then the lower edge of the film belt is coated with a long-lasting inchworm elixir ring to poison the females and larvae of the tree.

2) Biological control, in the larval stage (before the 3rd instar), can be sprayed with Bacillus thuringiensis (, containing billions of spores per milliliter, and more than 90% of the insecticide can be killed after one week. (3) The application of anti-ecdysone, with 50 100 milliliters of antiecdysone such as chlorpyramide No. 3 and chlorpylamide, the mortality rate of jujube inchworm can reach more than 90%. Before the third instar of Jujube inchworm, the control effect was the best, and after the old mature larvae pupated, most of them lost their feathering function in the following year.

4) Pole striking method, in the larval occurrence period, use its feigned death to hit the jujube branch with a wooden pole, so that the larvae can fall to the ground for manual hunting. (5) Chemical control, in the larval occurrence period, spraying the following agents in the crown can have a good control effect: 20% pyrethrin 2000 3000 times liquid, Lyfluin 3000 4000 times liquid, 50% methamidophos 800 times liquid, 40% hydroamidophos 1000 times liquid, 15% ricinoleate nicotine 800 times liquid.