Q: There are similar traces of the map on the leaves of the oil-bearing beans, and the white oval-shaped worms of 2-3 mm in potential leaves are visible on the back. What is the bug?
A: According to readers' description, it should be Liriomyza sativae. The larva infiltrates between the epidermis of the host leaves to feed and twists through it, resulting in irregular gray-white linear tunnels, commonly known as “ghost paintingâ€. Adult egg laying and feeding cause near-circular engraved dot depressions. The chlorophyll cells of the plant leaves are destroyed, and the area of ​​photosynthesis is reduced. In severe cases, the leaves are whitened, the yellow leaves fall off, and the entire plant withers. Adults fly 1.3 to 2.3 mm in length, greyish black, compound eye brown, tentacles yellow. Forefoot yellow-brown, black back in the chest, rear foot black. The wings are 1.3-1.7 mm long. The larvae are headless white, 3 to 4 mm long and 1 to 1.5 mm thick.蛹 1.7 to 2.3 mm, yellow, oval, ventral flat.
Liriomyza sativae is a multi-pest pest. It occurs in five generations in North China in one year, from April to November, and occurs in two peak periods, from mid-May to June and from September to mid-October. The suitable temperature for adults is 16-18°C, and the suitable temperature for larvae is about 20°C, which is divided into 3rd instar and the third instar is the most dangerous. The development period is 3-8 days. The flood season is 8 to 10 days. Liriomyza sativae mainly relies on the eggs and larvae to spread long distances with the host plants or earthworms, along with soil, vehicles, etc. of the cultivated plants.
Control methods:
1. Trap adult worms. Can be used sweet and sour liquid or environmental trapping trap. Insect trapping paper (ie, paper soaked with insecticides) can also be used to trap and kill 15 to 20 insect trapping papers per acre, and every 2 to 4 days for paper.
2. Drug control. With 1.8% of avermectin 3000 times; 20% of the sulfur-fixed Kebuwei EC 1000 times; 20% of the Indomethacin 2500 times; 48% of Le Sibu EC 1000; 10% imidacloprid 1000 times; 5% beta-cypermethrin EC is sprayed 1500 times. In order to improve the efficacy, a 500-fold decontamination liquid (Lipipine or silicone, etc.) can be added at the time of dispensing.
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