Scientific name Autographa nigrisigna Walker Lepidoptera, Noctuidae. Alias ​​bean silver moth, black spot Y moth, pea-building bridge insects, pea armyworm, bean step music. Synonyms Plusia nigrisigna Walker. Distribution northeast, north, Ningxia, Inner Mongolia.
Host soybeans, peas, cabbage, cabbage, lettuce and so on.
Injury is characterized by larvae eating leaves into holes or nicks that affect crop growth.
Morphological characteristics Adult body length of about 17mm, wingspan 34mm, dark brown, hindquarters and the first and third abdomen section brown bristles. The center of the forewing wing has prominent silver spots and U-shaped silver lines; the hind wings are light brown and the outer edges are dark brown. Egg hemispherical, yellow-green, with a vertical and horizontal grid. The last instar larvae are 32mm long. Head brown, black spots on both cheeks; chest yellow-green, back with 8 light vertical stripes, valve line light yellow; chest 3 pairs of feet, black; gastropod foot 2 pairs; tail foot l pairs, yellow-green. The dragonfly is 15-20mm long, brown, and thorns have bifurcated hooks and four small hooks around them. Obscure, visible from the outside to the shape of a dragonfly.
Living habits occur in the northern regions of China for 2-3 generations. Adults appear in June-August. With phototaxis, eggs are produced in bulk or in clumps on the back of the leaves. The larvae infested soybeans, peas, cabbage, cabbage, lettuce, and sunflower leaves from June to August, and they eat holes. The mature larvae grow thinly on the plants.
For control methods, see rapeseed-A.
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