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, wilting or even dead.
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 number of groups can be 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 of greenhouse whitefly should proceed from the following five aspects:
(1) Cultivation control includes the removal of various plants and their residues around the shed and the reduction of insect sources; cultivating celery, rape, leeks, etc. that are not like to be eaten as much as possible around the shed; pay attention to cultivating insect-free seedlings, even in nursery areas. Set 24-30 mesh insect-proof gauze.
(2) The Yellow Plane Induction is the use of whitefly on the tendency of yellow, set up a special yellow armyworm board in the shed, and 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). Brush oil once every 7 days.
(3) Chemical control is performed at the stage of spotting. The following agents can be administered: 10% Buprofen EC 1000x, 10% imidacloprid WP 2000x, 30% acetamiprid 1000x, 1.8% avermectin 2000x, 25% SM 1000 Dilution, 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 pesticides, 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 2-3 times; Pay attention to the back of the spraying blade and all possible insects.
(4) The dichlorvos fumigation method can also be adopted. In the closed greenhouse in the evening, sawdust mixed with dichlorvos emulsifiable concentrate is used. Each lore uses 80% dichlorvos EC 0.3-0.4 kg, or 22% dichlorvos smoke agent, 0.5 kg per mu. Mixtures such as isoprocarb and bufalin can also be administered.
(5) The artificial release of Lygus sinensis can effectively control the greenhouse whitefly. When the whitefly is released immediately after the discovery of whiteflies, when each of the whitefly adults has 1 or less, 1000-3000 lizard was released per acre. When the number of insects is large, the number of natural enemies released must be increased accordingly. Generally need to release 2-3 times continuously.
Glass Venlo Greenhouse is Spire-type glass design, design and installation of windows when more convenient and easy. Its roof slope andle can be appropriately according to the local real climate change the environment.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. the steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using 4 mm thick float glass.
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