The scientific name Aulacophora nigripennis (Motschulsky) is from the order of Coleoptera. The synonym is Ceratia nigripen-nis Motschulsky. Alias ​​black scorpion black guard melon. Distributed in Shaanxi, Shandong, Jiangsu, Hebei, Heilongjiang, Gansu and other provinces.
The host medicinal plants melon wilt, bitter melon, gourd, cucumber, pumpkin, wax gourd, mangosteen and so on.
The traits of adults kill the leaves, stems, flowers and melons of the melons. The larvae eat the roots of the melon seedlings, causing serious death of the whole plant.
Morphological characteristics Adult body length 5.5-7mm, width 3.2-4mm. Whole body is extremely bright; head, chest and abdomen orange-orange to red, upper lip, elytra, mid-thoracic and hind chest webs, side panels and each foot are black; tentacles smoke color, base two or end section Sometimes the color is lighter. Small scutellum or millet black, narrow triangle. About 2/3 of the body length, section 3 is shorter than section 4, and the width of the prosthodontic plate is shorter than 2 times the length. Sheath fins have a strong sheen. Both sides of the elytra wings are obviously widened behind the base, the base is slightly elongated, and the wing surface is densely engraved. The wavy edge of the end of the web of the female adult was the longitudinal edge of the web in the distal segment of the male adult.
Habits of life 1 to 2 generations, the adults in sheltered wind to sunny earth seams or stone seams and bark seam winter. Feeding began in early April of the following year. During the first ten days of early June, the first generation of adult eggs are spawned. During mid-June and early July, they enter the larval stage. In early July and mid-July, they phlegm. In mid-July and early mid-earth, adults emerged. In late July and early August, they enter. Emergence period. After the emergence of adult eclosion, they are mated in the daytime and the eggs are produced in the earth seam. Some adults did not mate and lay eggs, and the second-generation adults in autumn entered the overwintering state. After the emergence of adults in the spring, some of them were damaged by wilaya seedlings, some of them were moved to paulownia and eucalyptus leaves and they were fed back. By mid-May, they were all moved into melon fields. Adults eat the regenerating buds on the melon wilt residue before winter and occasionally kill loofah and cabbage. The insects like to cluster, often dozens or dozens of head damage a strain melon wilt, food damage into a net. Adults are active from 10 to 17 o'clock, dew does not dry and inactive, cloudy and rainy days are sluggish, and there are false deaths and accidental fall habits. Female and male adults were bred several times, and the number of eggs laid was 96-694 eggs. The eggs were prolific in the 1-2cm area of ​​the perennial plants. The newly hatched larvae infested the roots, and then they grew older and were fed into the roots for feeding. The worm larvae have a certain degree of rot-feeding, feeding on decaying melon wilting, and the old mature larvae are shed in the depth of 4-19 cm deep in the host rhizosphere.
Prevention methods (1) Early sowing, when overwintering adults have a large amount of occurrence, melon seedlings have grown more than 5 true leaves, which can reduce victimization and oviposition. This is one of the key technologies for prevention and control. (2) in the adult spawning period alone or mixed with plant ash, lime powder, sawdust or 2% Bataan powder, 2kg per 667m2 sprinkled on the soil or melon leaves near the melon root to prevent adult oviposition and damage. (3) Before and after transplanting the melon seedlings to 5 true leaves before spraying 50% Badan water solvent 1000 times or 10% imidacloprid wettable powder 1500 times, 20% fenvalerate EC 2000-2500 times, 10 % Dorabao suspension 1000 times. (4) 50% phoxim EC can be used to root the roots of the larvae. Stop the medication 5 to 7 days before harvesting.
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