As the temperature gradually decreased, some pests entered the greenhouse in order to avoid the winter cold. Whitefly was among them. Not only that, the greenhouse environment and fresh vegetables also provide very suitable nutrition and reproduction conditions for whiteflies, which makes the whiteflies gradually rise to the number one enemy in the northern greenhouse.
The main characteristics of the greenhouse whitefly: First, the individuals are very small, the adult is also a little longer than 1 mm, the length and width of the nymphs are less than 1 mm; the second is the adult wings and nymphs have white wax or waxy Protuberances or waxes; Third, they absorb a large amount of juice from the leaves, forming yellow spots and even yellowing the entire leaf, causing the plants to wilt or even die.
Whitefly adults have wings. When a person approaches, it will fly and it will be difficult to capture. In addition, although its individuals are small, the population is large. It took more than 10 generations a year in the north, with rapid growth, strong reproductive capacity, and prominent overlapping generations, all of which increased the difficulty of prevention and control.
Prevention and control of greenhouse whitefly should start from the following aspects: Cultivation and prevention include the removal of various plants and their residues around the greenhouse, reducing the source of insects; as much as possible around the shed to plant celery, rape, leeks, etc. do not like to eat food; pay attention to cultivating No insect seedlings and 24 to 30 mesh insect-proof gauze were set in the nursery.
The Yellow Plane Traps are based on the tendency of whitefly to yellow, and a special yellow armyworm board is set in the shed to keep the height of the crop or in the upper part of the vegetable canopy. Apply No. 10 motor oil (appropriate amount of butter to increase viscosity) and apply 1 engine oil every 7 days.
At the stage of spotting, chemical control was performed. The following agents can be administered: 10% Buprofen EC 1000x, 10% imidacloprid WP 2000x, 30% acetamiprid 1000x, 1.8% avermectin 2000x, 25% SM 1000 Diluent and 10% bifenthrin 1000 times, or fenpropathrin, cyhalothrin, etc. Chemical control should pay attention to the following three points: First, because the whitefly is easy to produce resistance to drugs, it should pay attention to the use of rotation and limit the number of medications; Second, due to the serious overlap of pests generation, generally require continuous control 2 or 3 times; Pay attention to the back of the spraying blade and all possible insects.
Dioxin fumigation can also be used to close the greenhouse in the evening, igniting sawdust mixed with dichlorvos emulsifiable concentrate, using 80% dichlorvos EC 0.3-0.4 kg per mu, or 22% dichlorvos smoke agent, 0.5 kg per mu.
The artificial release of citrifolia wasp can effectively control the greenhouse whitefly. When the whitefly is released immediately after the whiteflies are found, when each of the whitefly adults has one or less heads, 1,000 to 3,000 larvae are released per acre. When the number of larvae is large, the number of natural enemies released must be increased accordingly. Generally need to release 2 to 3 times.
Intermediate for CAS 170729-80-3
Aprepitant Intermediate,Aprepitant Api,Aprepitant Cas 30071-93-3,Trifluoromethyl Acetophenone
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