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The tussah moth, also known as the black silk moth, belongs to the order Lepidoptera. In the Renqiu region of Hebei, the main damage is 1000 pupa and crape myrtle. The rate of local worms in heavy-hazardous communities reached 35%. There were 26 worms per plant on the thousand-headed plagues, with a maximum of 38 worms per plant; on average, there were 12 worms per plant and up to 16 on the crape myrtle. Hazardous characteristics The larvae feed on the leaves of plants and often eat up all the leaves, affecting the growth of trees. Morphological characteristics Male adult body length 20 to 30 mm, wingspan 110 to 125 mm; female adult body length 32 mm, width 10 mm, forewing length 71 mm, rear wing length 55 mm, length 152 mm. Dark brown, tentacles feathery, head around, neck front, posterior chest, abdomen, dorsal line, lateral line and ends are white; forebrain brown, apical round, pink purple, with a black translucent eye spot, spot The upper part is white arc-shaped; each of the front and rear wings has a crescent moon spot; the upper edge of the crescent moon spot is dark brown; the middle part is a translucent white crescent; the lower edge is yellowish-yellow; 1 wideband, with central pink, lateral white, medial dark brown, with 1 white curve on the edge; brown bands on the wing area of ​​the forewing wing with white stripes of ">" or "<", connected to the crescent moon After the wings are spread, they form a “<>†pattern; the rear wings have three gray lines near the outer edge, the middle is wider, and the two sides are narrower, and the crotch area has a white arc strip from the leading edge to the trailing edge. Oval oval-shaped, about 1.5 mm long, 1 mm wide, off-white, with brown spots, each female lays over 100 eggs. The young larvae are pale yellow with black spots. After middle age, the whole body was white and green. The mature larvae are 58 to 62 mm long, greenish green, covered with white powder, and large in size with fine head, anterior middle chest and tail. There is a distinct row of thorns on the Asian backline, upper valve line, and lower valve line of each body section, the largest on the Asian backline. There are dark spots at the base of the Asian backline and valve line, behind the valve, under the valve, on the chest and foot. Chest feet yellow, belly-green blue, yellow end. Gas valve black. Tan is tan, about 30 mm long and 15 mm wide. It is grayish-white, olive-shaped, with an open upper end. It is about 52 mm long. Half of the cockroach is often wrapped in leaves. Biological characteristics occurred in the 1st year of the Renqiu region for two generations, and the wintering of the earthworms on the mixed shrubs. In mid-late and mid-May, adults emerged, copulated and spawned, spawned on the back of the leaves, eggs piled up, and larvae were hatched after about 12 days. The larvae of the first-instar larvae were endangered. The first-generation larvae hatched in early July and lasted about 30 days. The second generation of larvae hatched in August and September. In October, the larvae began to pupate and lick for the winter. Adults have phototaxis and strong ability to fly; female adults have strong ability to seduce. The eggs are produced on the back of the host's lobe and gathered in a heap; the newly hatched larvae are clustered. After larvae molting, often eat or leave a little to eat. Mature larvae are decorated with leaf scabs on the trunk, and overwintering often occurs on shrubs. Control methods (1) can be trapped and killed by black light during the adult period. (2) Artificial control: According to the larvae's colony, the larvae can be manually killed and the larvae can be harvested. (3) Use of natural enemies to prevent and control: The natural enemies of larvae are velvet bees, black spotted larvae, silkworms, and Beauveria bassiana; the natural enemies of eggs have Trichogramma. Pay attention to protection and utilization. (4) Chemical control: The larvae before the 3rd instar can be controlled and controlled, and the diflubenzuron 3 can be sprayed 1500-2000 times to prevent and cure; 800ml of the BT emulsion containing 10 billion live spores can also be sprayed; 20% can be sprayed. Benzolecan 2000 times liquid emulsion control, or 50% phoxim EC 1000 times, or 10% cypermethrin EC 1000 ~ 1500 times, or 2.5% deltamethrin EC 1500 ~ 2000 times liquid control. Can be sprayed continuously 2 or 3 times, pay attention to the use of chemicals to be sprayed alternately to prevent larvae resistance.