Whitefly is one of the pests most troubled by vegetable farmers. It has a wide range of damages and has poor control. In spite of the fact that vegetable growers use insect nets in and around greenhouses, it is still difficult to stop them from invading. To fully prevent and control, we must first understand the living habits of whitefly, and preventive and control measures can be effective.
Morphological characteristics: The life cycle of greenhouse whitefly can be divided into four stages: eggs, nymphs, cockroaches, and adults. The formation time is: Whitefly can produce 9-10 generations a year, a generation of about 30 days, and can lay eggs 100 times at a time. grain. Eggs are yellow-brown and oval in shape and spread on the back of the leaves. The nymph's body has an elliptical shape. The first-incubated first-instar larvae will crawl to find the proper position. Afterwards, the first-instar larvae will be fixed on the back of the leaves and the mouthparts will be sucked into the plants. The adult body is covered with a white waxy substance, and the plant sucker is used to suck the plant juice.
Symptoms of damage: Growing nymphs and adults sucking plant juices can cause leaf discoloration, curling, and atrophy. Nymphal secretions often induce plant mycosis and leave the leaves covered with a layer of black mold, resulting in normal photosynthesis of leaves. Respiration is disturbed and the plants are weak and dead. In addition, whitefly also often becomes the vector of viral disease.
Control measures: 1. Close the good seedlings and cultivate insect-free seedlings. Before the nursery, fumigation in the greenhouse removes the remaining insects, removes stubble weeds, and adds a layer of nylon yarn to the vents in the greenhouse to avoid foreign insects.
2, try to avoid mixed planting: especially cucumbers, tomatoes, beans can not be mixed. It is also an effective method to adjust the production of gargle, that is, the head lice arrange celery, bell pepper and other white turmeric as light vegetables, and the second pod of cucumber and tomato.
3. The branches and old leaves that are laid down in production are disposed of in time. Older nymphs are mostly distributed in the lower leaves. When the eggplant is pruned, some old leaves are properly removed, buried or burned to reduce the population.
4. Releasing the cirrhosa bumble bees or grasshoppers: When the adult whitefly is below 0.5 head/strain, a total of 15 larvae and bees are released every 15 weeks.
5. Verticillium can parasitize whiteflies and cause epidemics of population diseases. The greater the population density of whitefly, the better the infection, spread and prevalence of the bacteria.
6. Use yellow plates to trap adult insects. Yellow has a strong trapping effect on whitefly adults. In the greenhouse, yellow plates (1m 0.7m fiberboard or cardboard, painted orange peel yellow, and then coated with a layer of sticky oil per acre 32-34), the effect of trapping and killing adults was significant. The yellow plate is set between the rows and the height of the plants, and the viscous oil is generally adjusted with a small amount of oil on the No. 10 motor oil and recoated for 7-10 days. Take care to prevent oil droplets from causing burns on the crop.
7, chemical control: When the average of 3 adults per plant with 3% Tianda acetamiprid EC 1200 times, 70% LM liquid granules 15000 times, 25% AKT 3000 times dispersed granules Liquid, 25% buprofezin (Pentazoyl) WP 2000 times, 10% imidacloprid WP 1500 times and Tianda 2116 mix and spray 1-2 times, and prevent virus disease and powdery mildew. .
Chemical Reagent is the relative reference material for chemical research and component analysis. It is an important condition for scientific and technological progress. It is widely used in the synthesis, separation, qualitative and quantitative analysis of substances.
Early chemical reagents simply meant "pure chemicals used in chemical analyses and tests for the purpose of determining the composition or composition of substances". Later it was extended to "a chemical used for the purpose of a chemical reaction", and the term "chemical reagent" refers to a chemical that has long gone beyond this category. Some people think that "chemicals used in scientific experiments" can be called "chemical reagents". A more comprehensive definition of a chemical reagent may be a compound or element of various purity grades used in chemical tests, chemical analyses, chemical studies, and other tests.
In accord with national qualification, after we have made the corresponding qualifications, Human Api Product can supply for overseas customers a reasonable price products At the same time, we increase research in men's health, the production of Sex Enhancement Powder, to help the majority of male friends get rid of trouble, get rid of trouble. We also have a mature production process to meet the needs of our customers. The quality and price of our Healthcare Product make us our flagship product. We also provide weight loss related ingredients, Orlistat is our best-selling weight loss product.
Silymarin,Tamoxifen,Salbutamol,Clomid,Coluracetam
Xi'an Henrikang Biotech Co.,Ltd , https://www.xianhenrikangbio.com