What pesticides are used by whitefly whitefly

The whitefly is a common pest that causes chlorotic yellow and white spots on the leaves and spreads into patches as the damage increases. So what pesticides are better for whitefly?

1. Morphology of whitefly

1. Adult whitefly is 1.0-1.3 mm long, orange yellow and covered with waxy white powder. The forewings are purple-brown, with seven irregular white spots.

2. The nymph is black, 0.7 mm in length, with 14 pairs of bristles on the back and obvious white rings around the body.

3. The eggs of whitefly are long kidney shaped, adhere to the back of leaves, pale yellow at the beginning of production, and purple-black before hatching.

4. The pupae of the whitefly are elliptic, 0.7-1 mm long, dark and shiny, with serrated shell edges, wide white edges on the periphery, prominent ridges on the back, 9 pairs of long spines on the chest and 10 pairs on the abdomen. There are 11 pairs of long spines in females and 10 pairs in males on both sides of the margin.

2. How to control whitefly?

1. Strengthen management, reasonable pruning, good ventilation and light transmission, can reduce the occurrence and harm.

2. Before sprouting in early spring, combined with the control of scale insects, aphids, red spiders and other pests, spraying diesel oil emulsion or clay diesel oil emulsion with 5% oil content has a good effect on poisoning overwintering nymph.

3. At the peak stage of whitefly larvae, 40% omethoate, 50% dibromophos, 25% phoxim, 50% fenitrothion 1000 times each, or 5% fipronil suspension 1500 times, 20% imidacloprid 3000-4000 times concentrated solvent can be sprayed. We must pay close attention to the first generation of prevention and control.

Black thorn whitefly often harm rose, orchid, cinnamon, clove, grape and other crops, we should do a good job of prevention and control in time, so as not to cause greater harm.