Scientific name Diaphania py10alis (Walker) Lepidoptera, Polygonaceae. Alias â€‹â€‹Mulberry field name. Common names such as green worms, oil bugs, leaf curlers and so on. Distribution in Jiangsu, Zhejiang, Sichuan, Shandong, Taiwan, Anhui, Jiangxi, Hubei, Guangdong, Guizhou sang areas.
The main sang.
Characteristics of damage: The summer and autumn larvae spit into leaves or folds of leaves. The larvae hide the mesophyll, the residual veins, and the upper epidermis, and form a transparent gray-brown film. Afterwards, they break into holes, which are called â€œopen skylightsâ€. Its excreta contaminates the leaves and affects the quality of mulberry leaves. September-October due to the pest caused by mulberry yellow, affecting the fall silkworm or silkworm disease. Morphological characteristics Adult body length l0mm, wingspan 20mm, body tea brown, was white scales hair, was shiny silk, small head, both sides with white hair, compound eyes, black, oval, tentacles grayish white whip. The middle of the thoracodorsal back is dark, the front and rear wings are white with purple reflection, the front wing has 5 shallow brownish-brown bands, the middle l has 1 white round hole below, and there is 1 brown spot in the hole. The hind wings have broad tea-brown bands along the outer edges. The egg is 0.7mm long, flat, light green and waxy on the surface. The last-instar larvae are 24mm long, with super light, light green chest and abdomen, dark green dorsal line, black hairs on each section of the chest, and 1 hair bristles. It is 11.0mm long, long-spindle and yellow-brown. The center of the thoracodorsal spine is longitudinally ridged, and 8 long, slender hooks are made at the end.
Living habits Shandong 3-4 generations, Guizhou 3-5 generations, Jiangsu, Zhejiang, Sichuan 4-5 generations, Shunde, Guangdong 6-7 generations, are mature larvae in trunk cracks, pods, etc., overwintering. In Zhanjiang, Guangdong, 10-11th generation, 10 generations of Taiwan, overlapping generations, there is no obvious winter phenomenon. In the third year of the three-generation region, the larvae are larvae in spring, and the larvae of all ages are in late June, late July and late August, and the third generation is seriously harmed. The mature larvae crouch and overwinter in the late September and early October of the fourth quarter. The generation of larvae of each generation occurred in mid-June, mid-July, mid-August and mid-September, of which the 4th generation was the heaviest. Adult phototaxis, the eggs produced in the tip of the leaves, often 2-3 grains along the leaf veins together. The egg period is 28 days, the larval period is 12-19 days, and the flood season is 5-27 days. Summer and autumn are more humid and conducive to egg hatching. The natural enemies are Trichogramma, Trichogramma, Trichogramma, and so on.
Prevention and control methods (1) Use sow or grass to trap overwintering mature larvae. (2) Gradually kill the overwintering larvae near the leaves, cracks or buildings in autumn and winter, kill the newly hatched larvae in summer, and remove the victim leaves if necessary. (3) Place black light traps to kill adult worms. (4) Chemical control Three generations of areas in Shandong Province, four generations of areas in Jiangsu and Zhejiang, should pay attention to prevention and control of the third and fourth generations. In the late 2nd instar larvae, 80% of dichlorvos were sprayed before the leaves were rolled up. Oil 1000 times or 60% double-effect phosphorous 1500 times liquid, 90% crystal dipterex 1000 times, 25% imidophos EC 1000 times, 5% Ruigen suspension 1500 times, 50% symp Phosphorus EC 1000 times. (5) The infected silkworm area should be sprayed with 20% fenvalerate EC or 2.5% EC for killing EC in the late autumn silkworm, and the effect of general treatment of various pests is obvious.
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