When is the tea inchworm not? What are the hazards of tea inchworms?

Harmful symptoms of tea inchworms.

When the damage is severe, the leaves are often eaten, causing the fruit to fall off before it is ripe. Such as continuous.

If it is seriously damaged in two or three years, the plant will die.

The living habits of the tea inchworm.

One generation occurs a year, and the pupae overwinter in the loose soil around the tea tree roots. In mid to late February of the following year, they begin to emerge, mate, and lay eggs. From late February to early March, the oviposition period is high, the larvae hatch in late March, and the larvae pupate after the larvae mature in early and mid-June, and overkill and overwinter.

The control method of tea inchworm.

1. In autumn, the pupa is buried in the soil below 2 inches in combination with reclamation, so that it is not easy to feather.

2. Use the feigned death of adults to catch and beat in the early morning, or trap them with lights.

3. In the larval stage, avermectin, 20% fenvalerate emulsifiable concentrate 2000-3000 times or rotenol 300-400 times can be sprayed for control.

4. Use the natural enemies of the inchworm moth - parasitic wasps, parasitic flies, birds and fungi to prevent and control. The 2 3rd instar larvae were sprayed with the bacterial solution of 1 200 million spores per milliliter of Beauveria bassiana and Bacillus thuringiensis, and the extermination rate was more than 90%.

In addition, the great, brown-headed jay, white-headed bulbul, quail, bamboo pheasant, etc., among the birds, and the parasitic bees, such as the queen bee and the earth bee, are the main natural enemies of the tea ruler moth.

In winter, most of the tea inchworms overwinter in the rhizosphere topsoil of tea plants as pupa, and a few overwinter in the tea bushes as larvae. Most of the overwintering pupae are in a state of diapause, with strong resistance to stress and low mortality. The emerging rate after overwintering is greatly affected by soil moisture.

The larvae of the tea inchworm mainly feed on the young leaves and adult leaves, and can eat up the old leaves, new shoots, tender skins and young fruits of the tea tree when it occurs largely. After hatching, the larvae crawl to the top leaf margin or foliar surface of the tea plant to bite the epidermis and mesophyll, and bite the leaves after the second instar to form a C-shaped notch.

Tea inchworm and pest.

Ectropis oblique hypulina wehrli, belonging to the order Lepidoptera, is one of the most common and most harmful species in the tea garden inchworm family. Tea inchworm, the larva body surface is smooth, the abdomen is only the 6th abdominal segment and the gluteal segment with feet, crawling body bends and stretches, commonly known as archback worm, measuring scale worm, bridge-building worm, etc. It likes to inhabit the edge of the leaf, and the edge of the young leaf is reticulated semi-permeable patches; Later larvae often bite the leaves into large, smooth "C" shaped notches.

When the larvae bite the leaves into an arc-shaped defect is serious, the new shoots of the tea tree will be eaten bare, leaving only bald branches, causing the tree to weaken, and the cold is poor, and it is susceptible to frost damage. When a big happens, the whole tea garden is eaten up, like a fire, which has a great impact on tea production.

Tea inchworm is the most important leaf-eating pest on tea trees. The larvae mainly feed on the young leaves of tea trees, and when the occurrence is serious, a piece of tea garden can be eaten, which seriously affects the tree potential of tea trees and the yield of tea.

Natural enemies are the main factors influencing the population growth and decline of the tea inchworm, and the natural enemies that have been found so far include parasitic wasps, spiders, fungi, viruses and birds. Among them, cocoon wasps, viruses and fungi are particularly important.

There are four main prevention and control methods of tea inchworm: one is to clear the garden and exterminate the pupae. Combined with ambush tillage and winter fertilization, the insect pupae in the fallen leaves near the rhizosphere and the topsoil were buried in the soil, which could reduce the stock of insect populations in the field.

The second is light booby-trapping. Insecticidal lamps can be installed in the field to trap and kill adults during the adult stage of tea inchworm to reduce the occurrence of larvae in the next generation. The third is to protect and utilize natural enemies.

The ecological environment of tea plantations should be gradually improved to protect the parasitic and predatory natural enemies in the field and give full play to the control role of natural natural enemies. Fourth, pharmaceutical prevention and control. It can be sprayed with a nuclear polyhedrosis virus preparation of tea inchworms, with a dosage of 1 billion 5 billion polyhedrons per mu, and the annual dosage is the first.

I. The fifth and sixth generations have the highest pathogenicity, and the application period is mastered.

The first and second instar larval stage. It is also possible to use BT preparations or plant-derived pesticide source clearing and water-retaining agent, and the dosage is 800 1000 times the liquid.

Tea inchworm is commonly known as arch insect, archback insect, and hanging worm. It is one of the main pests of Chinese tea trees. Due to the large number of generations, rapid reproduction and rapid spread of this insect, it is very easy to break out. The tea-producing provinces south of the Yangtze River Basin, especially Jiangsu, Zhejiang, Anhui, Hunan and other provinces, have suffered serious cases.

The body of the inchworm is trapezoidal, the beak is thick and short, the end is brown, the compound eyes are black, and the shape is oval. Antennal knee-like whiplash. The plates have many granular protruding scales.

The elytra are longitudinally carved on the wing surface and slightly raised spindle-shaped between dense circular lines, the number of elytra is reduced, the root system is shortened, the budding is delayed, the number of bud bells is reduced, and the flocculation is delayed. Overwintering in the host over the winter. overwintering hosts, etc.

After hatching in early spring, the eggs live and reproduce on the overwintering host for several generations, and then produce winged viviparity at the seedling stage of the cotton field, and migrate to the cotton seedlings to reproduce. When there are many and crowded seedlings, the tea inchworm migrates and spreads. In late autumn, when the temperature decreased, the tea inchworm lay eggs for the winter after mating from the migratory to the overwintering host.

There are two stages of tea inchworms. Tea inchworm occurs before the emergence of seedlings to the bud, suitable for low temperature, when the temperature exceeds the inhibition of reproduction, the insect population declines rapidly. Sugarcane bugs occur mainly and reproduce when the average temperature of the bug population is rapid.

The mouth of the tea inchworm has obvious and sunny and rainy weather is conducive to sugarcane bugs. Slightly powdered with thin wax. The antennae of the head are shorter than those of the body and are related to the abdomen.

The abdomen and abdomen are round and the tail is round, and it continues to live in the rhizome, and can be solitary, and the offspring are still winged migratory aphids, and some species live in different hosts throughout the whole period between the host and the herbaceous host in order to change the host plant, and the host host takes its own host, and the winged migration occurs in the early summer of wintering, and the winged inchworm is transferred to the herbaceous host for several generations, and the winged one occurs in late autumn. Wings give birth to tea inchworms, which lay eggs for overwintering. Most species have the same host full cycle, and there is no description of the transfer between woody and herbaceous hosts, and only transfer between the same host plants.

Sometimes the wings of the tea inchworm migrate to the newly unearthed cotton seedlings to produce there, tapering towards the end, sometimes in the middle or at the end, most species are the same host sensory circle round, rarely oval, terminal ends. The eyes are mostly small, the abdominal canal is usually tubular, the plant is wide, thick, tapering towards the end, the part or end is composed of many chambers, and when the tea inchworm of each chamber is too dense, some grow membranous wings, looking for a new host. Overwintering on eggs.

The surface is smooth or corrugated or the end is reticulated, rarely raw, and rarely the abdominal canal is annular or absent. The tail piece is rounded. The end of the tail plate is round and smooth.

Tea inchworm feels circled with a round ventral canal.

(1) The method of investigating the number of eggs of Inchworm gray tea should be selected

2) The two body colors of black body type and gray body type are the same kind of organism, and the relationship between them is intraspecific

3) Climatic conditions such as temperature can affect the growth and development of insects and then affect the population number, in addition to the external factors that affect the population of C. griseus, there are natural enemies, infectious diseases, etc

4) The results described in data 2 did not match their dominant genetic characteristics, and the results were explained according to data 1, and the high temperature in the area was not conducive to the survival and reproduction of the black body population

So the answer is: 1) the same method.

2) Intraspecific relationships.

3) Natural enemies, infectious diseases, etc. The maximum number of populations that can be maintained in a given space without damage to environmental conditions.

4) The high temperature in this area is not conducive to the survival and reproduction of the black body population.