Mulberry snowdrop moth

Scientific name Spi10soma urticae (Espei) is a lepidoptera, genus Moth. Alias ​​yellow caterpillar. Synonyms Bombyzurticae Esp. distribution Heilongjiang, Liaoning, Shandong, Hebei, Jiangsu, Zhejiang, Xinjiang, Europe.

Host mulberry, tomato, eggplant, pepper, corn, soybean, sweet potato, mint, peach, millet, melon and so on.

The characteristics of larvae damage the larvae into nicks or holes. Severe veins remain only. In recent years, there have been reports of major occurrences in Hebei.

Morphological characteristics Adult females, body length 14.1 to 14.9mm, wings 40 to 44mm, body white, lower lip above the black, white below; antennae end black; chest with black bands, yellow above the leg; abdomen In addition to the base section and the end section of yellow, the abdomen is white, and there are seven black dots on the center of the abdomen and back, five dark spots on the side, and the individual differences are relatively large; the fore wings are white, the inner horizontal line, the outer horizontal line, and the submarine line have or More or less black spots, no trailing wings. Male genitalia had a chitinous ridge inside the base of the external genitalia, and the end of the genitalia was shorter than that of the star white snow moth. The egg is light yellow. The larvae are tan, dark brown after 4th instar, and the last instar larvae are 21.5-25.8 mm long. The body is covered with long hairs, and the bristles are dark gray. Each side of the chest contains 8 hairy tumors, and the abdomen l, 2 Sections and sections 7-9 have 14 tufts of hair in each section, two smaller in the center, and obvious valves. The head is black and the valve is white. The ellipse is elliptical, 11.4-15.5mm long, dark brown, internode yellow. The surface is rough, dense and engraved, and when the phlegm is removed, the knot is thin.

Living habits Hebei and Shandong Provinces are born 3 generations old, and they live in the ground for winter. Adults were observed from mid-April to early May. The first-generation larvae were infested from early May to mid-June. The larvae were 6 instar. The first-generation adults were seen in mid-June. The second-generation larvae were in mid-June. In early August, the second generation of adults began in late August; the third generation of larvae took place from mid-August to mid-September, and after mid-September the larvae passed winter. Adults lived 3–14 days/3.5–4.1 days of egg period, larval period 27.7–31.4 days, flooded period 10.3–11.3 days, generation period 48–52 days. After the emergence of adult eclosion, copulation and spawning began on the evening of the second day. Eggs were produced in the back or stem of the leaves, and were mostly produced in masses. There were 6 grains at most, more than 160 grains, and 150 to 750 eggs per female. . Adult phototaxis is strong and can be induced by black light. Adults like to inhabit the back of the middle leaves of plants in the daytime. They fly out at night and become active at 20-22. Newly hatched larvae only eat leafy meat. After the 3rd age, they eat the leaves as nicks or holes. , 4-6 years of age into the overeating phase, accounting for 90% of the total food intake, when the lack of food materials kill each other; larvae also perched on the back of the leaves or clumps and litters in the morning, began to feed in the afternoon, the highest in the evening, after 20 o'clock Began to reduce, the last instar larvae climbed to the ground, roadside stones or dry branches weeds in the silk knots, phlegm, phlegm, and winter.

Prevention methods (1) Reasonable pruning, pay attention to ventilation and light transmission, can reduce oviposition and reduce larval density. (2) If necessary, spray 50% phoxim EC 1000 times or 48% Loester 90* Diluent, 50% acetomethorone EC 1000x, 25% EKC 1500*.

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