Potato tuber moth

The scientific name Phthorimaea operculella (Zeller) Lepidoptera, Maggot family. Alias ​​potato moth, tomato leaf miner, leaf miner. They are distributed in potato and tobacco producing areas such as Shanxi, Gansu, Guangdong, Guangxi, Sichuan, Yunnan and Guizhou.

Host potato, eggplant, tomato, green pepper and other solanaceous vegetables and tobacco.

The larvae sneaked into the leaves, and the leaf larvae dipped into the leaves and left the upper and lower epidermis, showing translucency. In severe cases, the tender stems and leaf buds were also killed and the whole seedlings died. Potato tubers can be drilled in the field or during storage, appear as a honeycomb, or even hollowed out, shrinking and causing rot.

Morphological characteristics Adult body length 5-6mm, wingspan 13-15mm, gray-brown. The forewings are long and narrow, with 4-5 brown spots in the center and long ciliated hairs; the hind wings are gray and the crests are long. The egg is about 0.5mm, oval, yellow-white to dark brown, with a purple luster. The last instar larvae are 11-15mm long, grayish white, and the back of the larvae is pink or brownish yellow when cooked. The dragonfly is 5-7mm long, pale green at the beginning and dark brown at the end. The ventral surface of the 10th abdominal cavity is concave in the center, with a horn in the center of the back and the distal end bent upwards. The cocoon is gray, with dirt or yellow excrement on the outside.

Living habits are distributed in the western and southern parts of China, with the heaviest occurrences in the southwest. In the southwestern provinces, there are 6-9 generations in each year, and larvae or pupae live in the dead leaves or stored tubers. Tian asked that potatoes were more seriously affected in May and November, and indoor storage tubers were severely damaged in July-September. Adults emerge at night and have phototaxis. Eggs are produced at the leaf veins and bases of the stems, and the eggs on potato wedges are prolific in the eyes, broken skin, cracks, etc. The larvae crawled around after hatching, drooping drooping, falling on the leaves of neighboring plants as the wind moved down the leaves, and invading the leaves from the buds. The egg period is 4-20 days; the larval period is 7-11 days; the flood period is 6-20 days.

Control methods (1) Treatment of seed potatoes. Seedlings with insects, fumigated with methyl bromide or carbon disulfide, can also be sprayed with 90% crystalline trichlorfon or 25% quizphos-containing 1000 times solution, dried and then stored. (2) Timely earth training. Do not expose the topsoil to potato patches in the field so as not to be spawned by adults. (3) Chemical control: 10% of sepok EC 2000 times solution or 0.12% of Tianli E WP 1000 to 1500 times solution can be sprayed during adult growth period.