Some knowledge of blue lice

Blue lice, also known as whitefly (TRIALEURODESVAPORARIORUM), adults and nymphs cluster host leaves, suck juice, form macula by the sea, and secrete honeydew, causing soot disease.

Morphological features: the adult is about 1.1 mm long, light yellow, wings translucent, all covered with white wax powder. Egg yellow. The nymph is small, flat, oval, yellowish, covered with translucent wax. The pupa is oval, flat, yellowish green before Eclosion and white and transparent after Eclosion. There are wax thorns of different lengths on the back of nymphs and pupae.

Life habits: 11-13 generations a year, overwintering with mature nymphs or pupae. Most of the eggs are laid on the opposite side of the tender leaves of the host. The nymphs of the first egg do not crawl far, and most of them are fixed and parasitic near the eggshell, causing harm by sucking juice. The population density increased the fastest from July to August, and the damage was the most serious from August to September. Adults are not good at flying, the speed of migration and diffusion is slow, and there is an obvious harm center. Adults have a strong yellowing tendency. Prevention and control methods: orchids planted in the greenhouse can be sprayed with a dose of 1 ml per cubic meter of 80% dichlorvos in winter, and fumigated airtight, closed for 8 hours and then opened for ventilation. Adults can be trapped and killed with orange-yellow trap cards. Control agents: choose 2000 times of 25% buprofezin wettable powder, 2500 times of 2500 times of Aktai EC, and 3500 times of 2.5% kungfu EC.