Adults and nymphs gather on the back of the leaves to absorb plant juice, causing the leaves to chlorotic and yellow, causing the plants to grow weak, to the death of the whole plant, and to secrete honeydew to cause coal pollution in the leaves and fruits, affecting photosynthesis of plants.
Second, why is it difficult to prevent and control greenhouse whitefly?
1. Greenhouse whitefly has a short life cycle, and can be completed in 8 to 9 generations a year. The common generations in the greenhouse overlap, which brings difficulties to prevention and control. 2. Greenhouse whitefly, each adult can produce 150 eggs, the reproduction rate is high, once the hazard spreads, it is difficult to control. 3. Greenhouse whitefly, eggs and aging nymphs are highly resistant, and general medicaments are difficult to control.
Third, prevention and treatment methods
1. Cultivate insect-free seedlings, control greenhouse whitefly and bring them into the greenhouse with seedlings. 2. Remove the weeds in the greenhouse and take them out to prevent the greenhouse whitefly from moving to the vegetable seedlings. 3. Fumigation or spraying with chemicals before planting to kill the greenhouse whitefly in the greenhouse. 4. Greenhouse vents and doors plus insect-proof nets to prevent greenhouse white mites from moving to the greenhouse. 5. The yellow plate is suspended in the greenhouse to trap the adult whitefly of the greenhouse, and 20 to 25 yellow plates are hung per acre. Note that the height of the yellow plate should be consistent with the upper leaves of the plant. 6. Pay attention to the alternating use of drugs, every 7 to 10 times, and prevent 3 to 4 times, so as to prevent the resistance of pests, and solve the problem of overlapping prevention and control of generations.
Commonly used agents are: cockroach 1000 times liquid; locust forest 1000 times liquid; azadirachtin 800 times liquid; deltamethrin 3000 times liquid, fenvalerate 2000 times liquid and the like. (Province “Healthy Experts of Plant Diseases and Pests of 12316 Sannongâ€)
Gansu farmers report
PVC Ceiling Tiles(pvc 3d decoration ceiling)
As new materials for ceiling decoration.
The 3D Ceiling Tiles offer various patterns for choosing,such as marbling,wooden,others design.
More nature,elegant looking.
Substitute the marble tiles,PVC tiles,Wood tiles,etc. Used widely in interior decoration.
Feature
1. Fireproof
PVC 3D Ceiling Tiles is non-flammable and conforms to the national grade B1 standard (GB8624-2012 Grade B1).
2. Water-proofing and moisture-proofing
The product is allowed to long-term expose to moist environment.
3. Easy to install
Pvc 3D Ceiling Tiles is easy to cut, saw nail, stick. it has a smooth finish one side that can be taped and jointed ready for decoration including wallpapering, painting, texture coat and veneer, and a rougher side for tiling.
5. Environment
PVC 3D Ceiling Tiles does not contain any organic solvents, formaldehyde, asbestos, oils or other toxic substances that can have a negative impact on the environment and waterways.
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Specification size |
1220mm*2440mm |
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Surface Finish |
High UV coating |
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Thickness |
1-9mm |
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Color |
Customized colors |
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Hardness |
3H-6H |
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Materials |
PVC |
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Type |
PVC 3D Ceiling Tiles |
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Installation |
Easy installation |
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Life Span |
15 years |
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Place of original |
China |
PVC 3D Ceiling Tiles
Shower Bath Pvc 3D Flooring Tiles,Pvc Bathroom Ceiling Tiles ,Waterproof Pvc 3D Ceiling,Acoustic Panel 3D Ceiling Tiles
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