The occurrence rule of spring ruler and its comprehensive prevention and control technology

How to prevent and control the spring ruler? It is a forestry pest that is mainly monitored in the Fuyang area in recent years. It can harm apples, pears, jujubes, apricots, walnuts, grapes, poplars, willows, alfalfa, alfalfa, mulberry, and sand jujubes. The larvae feed on the young shoots and flower buds, which seriously affect the normal growth of the host. The older larvae feed on the leaves and eat a large amount of food. They often eat too much, and eat the leaves in a short period of time, causing the branches to dry up and the tree to weaken. Let's take a look at the law of spring rule and the green prevention and control technology.

1 Identification feature

The female adult is grayish black or taupe (the host body is different in body color), the antennae are filamentous, the black thorns are arranged in rows on the back of the abdomen, the tip of the thorn is round and blunt, and the hip plate has protrusions and black thorns. Male adult anterior wings are grayish brown to dark brown, with 3 brown wavy horizontal stripes, and the middle one is often not obvious.

2 Law of occurrence

Spring stalks occur in the Fuyang area for one generation in one year, and the summers and winters in the soil around the base of the trunk. In mid-February of the next year, when the ground temperature of 3~10 cm under the local table was around 0 °C, the adults began to emerge and emerged. The peak of emergence was from late February to early March. In some years (such as 2016), winter temperatures are higher, and adult feathering occurs in early February. Adults are mostly emerged in the afternoon or at night, and the male adults have phototaxis. During the day, they are lurking in the gaps and branches of the trunks and mating at night.

The beginning of the egg is in late February, and the spawning period is in the middle of March. The eggs are mostly produced in the bark gaps, dead branches, branches and branches of the trunk below 1.5 meters, and more than ten to dozens of capsules are produced. Block or strip. The number of eggs laid per female is about 100, and the egg period is 15 to 30 days. The larvae hatch in the middle and late March, and the larvae enter the peak of 2 to 3 years in mid-April. The larvae are 5 years old, and the newly hatched larvae have weak activity. They feed on young shoots and flower buds. When they are larger, they feed on the leaves. The larvae above 3rd age are the most serious. They enter the gluttony period in mid-April and the larvae of 4~5 instars have strong hunger resistance. It can be spread by the wind and spread to the nearby forests. After being disturbed, the silk will fall, and the silk will be attached to the tree. In late April, the larvae began to mature into the soil, secreting mucus-hardened soil in the soil under the canopy to make soil chambers, and the depth of the soil was 16 to 30 cm, accounting for 65%, and the deepest was 60 cm, distributed around the trunk. There are more low-lying areas. In the first half of May, it entered the peak of the pupation. The flood season is more than 9 months.

3 Causes of the outbreak

3.1 蛹 feathering speed

Appropriate soil and climatic conditions promote the emergence of large numbers of cockroaches into adults. When the ground temperature of 3~10 cm under the local table is around 0 °C, the spring frogs begin to emerge from the winter. In the year when the temperature rises rapidly in spring, the amount of emergence feathers in 10 days can exceed 70%.

3.2 Egg hatching rate is high

Biological characteristics determine the likelihood of an outbreak. The spring scorpion has the characteristics of polyphagia, gluttony, sagging, and high reproductive survival rate. In normal years, adults become mated and lay eggs after 1 week of emergence. One female adult can lay about 100 eggs. Under suitable temperature conditions, larvae can be hatched for 15 to 30 days and the survival rate is high.

3.3 Increase in host tree species

In recent years, with the implementation of forestry ecological engineering projects and various forestry policies, the planting area of ​​host trees such as apples, pears, walnuts and poplars has increased significantly, which has created a good survival, occurrence and reproduction of spring stalks. Living conditions.

3.4 The timing of prevention is not allowed

The first generation occurs in the first year, and the time is short. The hatching larvae of the newly hatched larvae are small, and the young larvae endanger the young shoots and flower buds. The food is small and difficult to be found. Once the tree is scattered to the upper part of the canopy, it is missed. The best time for prevention, the tree is dense and dense, and the prevention and control is difficult.

4 Green prevention and control technology

4.1 Turning method

First, before the soil is frozen, within the range of 1 to 1.5 meters from the trunk, the soil around the tree tray is deepened by 30 to 40 cm deep, and the winter is frozen at the low temperature in winter; the second is combined with fertilization, turfgrass, etc. after early spring thawing. Management measures, excavation of worms to feed poultry and reduce the source of insects.

4.2 trapping method

Adults occur from the beginning of February to the beginning of March. The first is to use the phototaxis of male adults (female adults without wings), using black light to trap the adult, the lamp hanging height is 1 to 3 meters, hanging every 200 meters, every day from 19 From 00 to 6:00 the next day to turn on the light and trap; the second is sexual attraction, hanging a sex trap per acre to trap male adults, the sex inducer is generally replaced once every 15 days; the third is 10 parts of water + 6 parts of sugar + 3 parts of vinegar + 90% trichlorfon crystals are mixed into sweet and sour liquid into the forest to trap male adults, put 2 to 3 pots per acre; by trapping male adults, reduce the chance of male and female mating, to reduce the number of insect population.

4.3 barrier method

In early February, 1 to 1.5 meters on the trunk was tied with tapeworm tape, which was tied to a loose trumpet shape, and the female adult and hatched larvae were blocked in the lower part of the trunk to kill.

4.4 Ovidom removal method

From late February to early March, before the hatching of spring stalks, use a knife or scorpion and other tools to excavate the egg masses in the bark gaps, dead branches, branches and breaks, and burn them in a concentrated manner, which can achieve twice the result with half the effort.

4.5 Earthquake method

In the larval stage, the larva is subjected to the habit of drooping and drooping, and the trees (saplings) are shaken vigorously, and the larvae are shaken and then concentrated.

4.6 Pharmacy

First, aircraft control, the main agent uses 3.6% nicotine matrine microcapsule suspension agent + 1% avermectin microcapsule suspension agent, 50 grams per acre, and added sedimentation salt and wetting agent urea 10 grams each The spraying amount is not less than 300 grams per acre. The second is ground spraying, which has a small area, scattered trees and inconvenient working places of the aircraft. Before the larva hatching to 3 years old, the trunk and the middle and lower parts of the canopy are 1500 times of the 25% chlorfenapyr III suspension. The solution is sprayed with liquid or 20% diflubenzuron suspension 4 000 times solution.

The above is the full content of the spring ruler and the green prevention and control technology. If you have such a hazard there, you can come to Huinong.com to learn!

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