One, whitefly characteristics and habits Whitefly adults, larvae and eggs fixed on the back of the plant leaves, sucking plant juices, especially in the majority of young leaves, resulting in leaves fade, yellow, withered until dry. Whiteflies excreta can cause coal pollution, affecting flowering and ornamental effects. Whitefly has the characteristics of emigration and it is also the medium for spreading plant viruses. It is responsible for flowers and shrubs such as red string, cineraria, colored plum, rhododendron, hibiscus, hydrangea, pansy, and pulpy plants.
Whitefly adult yellow and white, wing membrane transparent, body surface white waxy powder covering, hence the name Whitefly. Small body, easy to leap, not easy to capture. Eggs and larvae are basically oval in shape, about 0.5 mm in size, light yellow and transparent, with white wax on the outside. The eggs can be hatched as larvae after one week.
Whitefly is a warm, unventilated environment that occurs more than 10 generations a year. It breeds quickly, spawns a large amount of eggs, and the generation overlaps severely. Overwintering occurs on greenhouse plants in each species. Adult insects live in groups and spawn on the back of the upper tender leaves and feed on them. When adults live on leaf surfaces, they are often distributed in pairs. Plants continue to grow, and adults continue to migrate to the upper leaves. The uppermost part of the general plant is the adult and the newly born egg, followed by the brownish-black eggs to be hatched, and then the young larvae and the second and third instar larvae, the lower part is the “false worm†and the feather that has already emerged. shell. In general, each female can lay eggs of 100-200 eggs, and the eggs are hatched as larvae for 6-8 days. The larvae enter the flood season by 8 to 10 days, and the adult larvae emerge by about 7 days.
Second, control methods
1. Horticulture Control Remove weeds from greenhouses and greenhouses to reduce the source of insects.
2. Chemical control with 80% dichlorvos 1:2 water atomization fumigation, according to 1 ml of liquid per cubic meter, every 5 to 7 days 1 time, each time fumigation must close the doors and windows. Can also be sprayed with 2.5% deltamethrin 2000 times, or 20% speed kill Ding 2000 times, 2 kg per 667 square meters, spraying once every 6 days, continuous 2 or 3 times, are good effect.
3. Physical control The use of whitefly has a strong tendency towards yellow, yellow plastic plates can be suspended or inserted indoors, and sticky oil on the plate, so that the flying adults stick to the plate themselves, and play a good trapping effect.
Surfactants, known as "industrial monosodium glutamate", refer to substances with fixed hydrophilic and lipophilic groups, which can be aligned on the surface of the solution and make the surface tension decrease significantly. Surfactants are generally organic amphoteric molecules with hydrophilic and hydrophobic groups, which are soluble in organic and aqueous solutions. Hydrophilic groups are often polar groups, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amino groups and their salts, but also hydroxyl, amide, ether bonds; hydrophobic groups are often non-polar hydrocarbon chains, such as hydrocarbon chains with more than eight carbon atoms. Surfactants are classified into anionic surfactants (mainly soaps, sulfates, sulfonates), cationic surfactants (also known as quaternary amines), amphoteric surfactants and non-ionic surfactants (mainly including fatty acid sorbitans, polysorbates, polyoxyethylene fatty acid esters) Polyoxyethylene fatty acid ether, etc.)
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