Cotton Daddy

The scientific name is Clania variegata Snellen, Lepidoptera. Alias ​​big bag moth, big moth. Synonyms Cryptothelea variegata Snellen, Cryptothelea formosicola Strand. Distribution in the Yellow River Basin and in the south.

Host cotton, mulberry, tea, cabbage, cabbage, fruit trees.

The characteristics of larvae larvae moved to cotton fields from July to September to injure the upper leaves and tender heads of the plants. The newly hatched larvae leave the epidermis behind the leaves of the leaves. After the third instar, the cotton leaves bite into holes or nicks, and even the leaves are eaten. pulse.

Morphological characteristics adult male and female. Female adults have hypertrophy, light yellow or milky white, no wings, feet, tentacles, mouthparts, compound eyes are degraded, the head is small, light auburn, the center of the back of the chest has a brown base, the chest and the first abdominal section side of the yellow hair There is a yellow short hair band at the posterior edge of the seventh abdominal segment, and a sharp contraction below the eighth abdominal segment. The external genitalia are developed. Male adults are small and medium-sized moths, wingspan 35-44mm, body brown, with pale vertical stripes. The forewings are reddish-brown with black and brown markings. There are 1 transparent spot between R4 and R5 base half, Rs and M outer edge between veins, and between M2 and M3. R3 and R4, M2 and M3 handle together, A There are several transverse veins between the veins and the posterior border; the hind wings are dark brown and reddish-brown; the midline fork-like branches of the anterior and posterior wings are prominent. Egg oval, diameter 0.8-1.0mm, light yellow, shiny. Male larvae are 18-25mm long, yellow-brown, 50-60mm long, and they are 28-38mm long, tan, and 70-90mm long. The head is dark brown and each suture is white; the chest is brown with milky spots; the abdomen is light yellow-brown; the pectoral feet are well developed, dark brown, and the gastropods are degenerated into discs with 15-24 hooks.蛹 蛹 蛹 18 18 18 18 18-24mm long, dark brown, shiny; female 蛹 25-30mm long, red-brown.

Life habits occur in the North China, East China, and Central China regions for one generation, and mature larvae live in the crop. In late spring, in late spring, phlegm begins, and the end of April and early May are adult eclosion stages. Female moths are more common than male moths. Male moths leave the hernia sac to find female moths; females do not leave their crops after emergence, at dusk. Extend the head and chest out of the capsule and attract male moths. The mating time is usually between 13:00 and 20:00. Female adults produce eggs in the crop, and each woman can produce 3000-6000 grains. The larvae immediately spit and sac after hatching. The instar larvae have social habits and can droop and spread with the wind. The larvae begin to metastasize at 3-4 years of age and are dispersed. From late September to early October, the larvae overwinter in the bursa.

Prevention and control methods (1) Combine cotton field management, remove the crops and destroy them in time. (2) spraying 50% of malathion-containing EC or 90% of trichlorfon crystal in 1000% of young larvae, 20% of methomyl EC, 25% of KRW or 40% of Xinxin EC 1500 times, 5 % Laurerin EC 2500 times.