How to control cotton leafhopper? How to prevent and control the damage of flower cotton leafhoppers

<> 6 8 generations occur in the cotton area of the Yellow River Basin every year, and they begin to migrate from late June to early July, and the peak period of damage is from early August to late September, and it begins to subside in early to mid-October. The algebraic differences in the cotton area of the Yangtze River basin are quite large, and the rampant period is from mid-July to mid-September. The reproduction of cotton leafhoppers increased in high temperature and drought, and the damage was aggravated.

The key points of prevention and control are as follows.

1) Agricultural control: Eradicate weeds at the edge of the field in winter and spring to reduce the source of overwintering insects; Insect-resistant varieties with hairy leaves and long hairs can be planted in the reoccurring areas.

2) Chemical control, scientific and treatment 6 August hazard peak, combined with the control of cotton bollworm, aphid, cotton leaf mite and other pests, spraying chemical pesticides for treatment. It can be sprayed with 1500 times liquid spray such as 90% trichlorfon, deltamethrin or 40% probromophos, or 2% isoprocarb powder or 5% menacarb powder, 2 kg of powder per mu, and reapplied once 3 5 days after the drug.

1) Agricultural control.

Strengthen vineyard management and improve ventilation and light conditions. After autumn, remove dead leaves and weeds in the garden in time to eliminate the source of overwintering insects. During the growing season, weeds at the edge of the field should be removed in time to reduce the habitat of leafhoppers.

2) Chemical control.

Master the application of pesticides in the peak period of nymphs, and focus on the prevention and control of the first generation of nymphs. During the occurrence period, you can choose to spray 3000 times of cyhalothrin EC, or 2000 times of 10% cyhalothrin EC, or 20% imidacloprid wettable powder 2000 times, or 25% Alika water 3000 times.

The flowers harmed by cotton leafhoppers in flowers include hibiscus, hibiscus, hibiscus, hibiscus, hollyhock, camellia, chrysanthemum, peony, canna, dahlias, bergamot, mallow, grapes, etc.

The number of generations of cotton leafhoppers varies from place to place, and the Yangtze River basin is about 10 generations, and the adults and nymphs suck the sap on the back of the leaves of the host flowers, so that the leaves appear black-brown spots, and the whole leaves are discolored and scorched in severe cases. Adults are more than daytime feathering, after the feathering of the second source of the foci can lay eggs, the eggs are scattered on the back of the young leaves, the leaf tissue instar nymphs often rarely live near the leaf stem near the petiole damage, adult nymphs mostly feed on the back of the leaf, cloudy days or night to the front of the leaf damage. The weather is sunny, the temperature drops below 15 12, the adult is sluggish, and the temperature drops below 6 12 and enters dormancy.

Hail. The leafhopper pests on flowers and the peach spotted leafhopper harm the moon, rose, plum blossom, mountain flower, begonia, etc.; Grape leafhopper harms chrysanthemums, dahlias, bunches of flowers, peach blossoms, grapes, etc.

The method of controlling leafhoppers is first of all clean and hygienic, some weeds and brick crevices are its wintering places, and at the same time, it is necessary to cut off the branches that have been slaughtered on the branches, and know and eliminate them. If it is found that there is already leafhopper damage, you can spray 40% dimethoate 1500 2000 times, or 10% imidacloprid 6000 times, or carbaryl wettable powder 1000 times for control.

Leafhopper common name floating dust, in China's crops mainly have more than 10 kinds of large green leafhoppers, black-tailed leafhoppers, white-winged leafhoppers, cotton leafhoppers, etc., can harm rice, corn, wheat and other grasses and soybeans, cotton, potatoes and other crops, mainly to adults, nymphs suck plant juice, can make the leaves withered, faded, deformed, and even the whole leaf dies. In addition, they are the main vectors of viral diseases.

1) Morphological characteristics.

The adult body is several millimeters long, resembling a cicada, and its body color is green, white, yellow-brown, etc. The top of the head is rounded, the wings are translucent, leathery, the color and markings are different, the adults like to jump and fly, and the eggs are laid on the back of the leaf or on the leaf sheath tissue; Nymphs are mostly 5 years old, the body is brown, gray-white, yellow-green and other colors, and wing buds appear after the 3rd instar, and the jumping ability is good. The insect is infested in many clusters, and can crawl diagonally or jump away after being frightened.

Adults are phototaxis.

2) Regularity of occurrence.

More than ten generations occur every year, and the overlap of generations is serious, and eggs and adults can overwinter in plant skin cracks, weeds and soil cracks. After the temperature rises in the following year, it begins to move, and the suitable temperature is 20 30, and the north mostly starts in May and June. High temperatures and humid weather are conducive to its occurrence, but heavy rain can wash away and kill a large number of insect populations.

Therefore, when the weather is hot and humid, it is necessary to pay attention to the development of the insect and prevent the occurrence of disasters. Due to the overlapping generations, the peak damage is mainly related to the weather. The insect can migrate, is another vector of viral diseases, can transmit a variety of viruses, therefore, the prevention and control of it should be the premise of the prevention and control of viral diseases.

After the autumn crops are harvested in October in the north, the leafhoppers move to winter wheat and other vegetable crops for a period of time and enter the overwintering state.

3) Prevention and control measures.

Choose insect-resistant and disease-resistant varieties.

Booby-trap adults: Trap adults with a black light and then destroy them centrally.

Pesticide control: spraying pesticides at young age, or when adults and nymphs swarm, trichlorfon powder, 2% leafhopper powder or 5% carbaryl powder can be used, 2 per meter

With 2 kg, powder can be sprayed; It can also be sprayed evenly with 25% quinithion, 40% dimethoate 1000 1500 times liquid, or 50% malathion and other agents (to be sprayed on the pest), mainly concentrated on the back of the leaf.

Control methods of leafhoppers: mainly with pesticide control, master the selection of nymphs in the peak period, 50% leafhopper dispersed emulsifiable concentrate 1000 times, 10% imidacloprid wettable powder 2000 3000 times liquid, 48% lesbian emulsifiable concentrate 1500 times liquid spraying.

Cotton leafhopper: Cotton leafhopper is also known as cotton leaf jumping insect and two-point floating dust. It can harm a variety of chrysanthemums, hibiscus, hibiscus, kapok, cotton, elm, willow, sycamore, eggplant, grapes and other flowers and crops.

Adults and nymphs concentrate on the dorsal spur of the leaves to suck the sap, and the affected leaves gradually turn yellow from the tip and leaf edge to the inside to red, scorch, and shrink, and the plant is also dwarf and dead. In addition, cotton leafhoppers can also transmit viral diseases.

Prevention and control methods: It is necessary to take the prevention and control measures of controlling the source of insects, ensuring comprehensiveness, treating the early stage, protecting the later stage, treating the seedling field, protecting the field, treating the pre-season, and protecting the post-season.

Agricultural prevention and control: 1. Reform the farming system according to local conditions, and reduce the planting area of single-cropping rice and reduce bridge fields in the areas where single-cropping and double-cropping rice are mixed with dust. 2. Reasonable distribution of varieties, the implementation of the same variety, the same growth period of rice jurisdiction and continuous planting, to avoid flower arrangement planting.

3. Strengthen fertilizer and water management. The rice does not violently drape leaves in the early stage, does not lose fat and yellows in the middle stage, does not covet green and late maturing in the later stage, and increases insect resistance. 4. Improve cultivation techniques.

5. Breeding high-yield insect-resistant varieties.

Artificial physical control: light booby-trap. More than 80% of the adults are female. Bu Han and most of them are pregnant with eggs. Lighting can be divided into insect peak periods from late June to August. Artificial killing. Kill with insect nets or trawls.

Chemical control: 1 2 times during the peak migration period; In the late rice seedling field, the medicine was applied once every 5 7 days after the seedlings were green.

Commonly used agents: malathion, Ruijinte, 50% diaziphos emulsifiable concentrate.

1) Strengthen the prevention and control of overwintering, and reduce the base number of overwintering insects.

2) Promote continuous planting and reduce flower arrangement. This is easy to prevent and reduce the infection between different stubbles.

3) Pay close attention to the prevention and control of seedling fields and the prevention and control of encirclement and annihilation during early rice harvesting to reduce infection. The early rice seedling field focuses on the double-cropping early rice and the late season rice seedling field. Honda should pay close attention to the prevention and control of early rice that has been planted early and early rice that has been planted in the late season.

4) Pesticide control: planthopper with rice.