The scientific name Polia il10ba (Butler) is in the order Lepidoptera, Noctuidae. Alias ​​苜蓿 Purple Moth. The worms are distributed in Heilongjiang, Inner Mongolia, Hebei, East China, South Central, Gansu, Jiangsu and Jiangxi provinces.
Infested mulberry, eggplant, junda, hummus, beet, strawberry, alfalfa, chrysanthemum, garland chrysanthemum, kidney bean, grass-eating silkworm, pea, alfalfa, soybean, double bean, blackberry and so on.
Damage characteristics The larvae eat leaves into nicks or holes and, in severe cases, eat leaves from the leaves. It can also harm the tender heads, buds and berries.
Morphological characteristics Adult body length 15-18mm, wingspan 38-42mm. Brown to reddish brown, brown belly, brown hair on abdomen. Sword on the forewings is thick and brown; mosquitoes are brownish-brown and round; kidneys are irregular, larger, grayish-brown; outside is tan, zigzag; subterminal lines do not become saw-shaped after midrib; margin brown. The fins are long and brush-shaped. Most of the hind wings are reddish-brown, with a pale base and pale white hair. Yellow and white tentacles. The lower lip must be reddish brown and stretch upward. Foot red-brown, hairy knots with long hair, the outer side of the front foot section with white borders, the front, the middle part of the tug with no black spots. Each festival has a white ring. Egg hemispherical, 0.65mm wide, 0.4mm high, with about 50 longitudinal edges in the middle, thin lines between the edges, the initial production of light green, purple brown after. The last instar larvae are 35-45mm long, 3-3.5mm wide, brown netted, black in one eye, brown in the forequarters, 1 vertical column in the top and bottom lines, and yellowish-white round spots in the round spots. Brown-brown edges, 5-7 pieces per column, hair piece round black; Valve line dark brown, with a dark brown round spots along the upper; valve light yellow to yellow, gastropod foot color and body color. Toe hook single sequence belt. The newly hatched larvae are grayish-brown and belly red-purple. The whole cloth has large, black hairs, and the feet are in feet. After feeding, they reach the 3rd instar larvae in green or blue-green color. Become red-brown. The cockroach is 18-20mm long, 6-7mm wide, dark brown, and the lower jaw must reach the posterior edge of the fourth abdominal segment. The corpus callosum is rough, and the thorn is short and thick, and the end is divided into two.
Living habits Jilin and Yinchuan are born 2 generations old and live over winter. In the following year, the first generation adult insects in Jilin appeared in early May. The first generation of larvae appeared in early June and the second generation of adults began in early August. Mating and laying eggs often produce eggs on leaves or branches, each egg producing 150 eggs. -200 grains; the first adult of Yinchuan appeared in mid-late of May, and the second generation of adults emerged from late July to early August. The first and second instar larvae clustered on the back of the leaf to damage the mesophyll, and some of them bored into the buds to feed on them. After the third instar, it began to disperse. At the fourth instar, it appeared in a pseudo-dead form. It inhabited on the back of the leaves or on the heart and leaves in the daytime. It entered the gluttony during the fifth and the sixth, and it could eat 1-2 leaves every 24 hours. The last instar larvae Destroyed the mulberry tender head, buds, young fruit and so on. After the larvae entered the final age, the larvae were removed at 3-6 cm in the soil. The larvae hide their backs during the day, feeding mainly at night, and are disturbed by the habit of curling up. Adults have phototaxis. Natural enemies have toothed bees, spiders, blue dragonflies, etc.
Prevention and control methods (1) Set up black light lamps, conduct forecasting and prevention. (2) Manually kill larvae. (3) If necessary, spray 50% phoxim EC 1500 times or 25% EKC 1500 times, 16% SF No. 3 1500 times, 1.8% EDF 3,000 times, 20% Kill 3,000 times of pyrethrin EC. (4) It is also effective to use 2% Badan powder, every 667m2kg, mixed with fine dry earth 15k8 to produce poisonous soil and spread it between the strains.
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