Scientific name Helicoverpa armigera (Hubner) Synonyms Heliothis armigera Hubner Lepidoptera, Noctuidae. Alias ​​corn earworms, cotton pick insects, borers, green worms, cotton bollworm and so on.
Host corn, cotton, peanuts, sesame, tobacco, apples, pears, oranges, peaches, grapes, figs, straw and so on.
In recent years, in some regions where cultivation has been reformed and where the area of ​​multiple cropping has been expanded, the cotton bollworm has been aggravated by damage, especially in southern Liaoning, the Yangtze River basin, and parts of Xinjiang. Maize ear is often damaged by cotton bollworm larvae. In August 1996, Qinghai Province discovered for the first time that the pest was responsible for corn. The area of ​​its occurrence was large, the amount of insects was large, and the loss was heavy. It was rare. The result was that the ear damage was not strong and the yield was severely reduced.
Morphological characteristics Adult body length 14-18mm, wings 30-38mm, gray-brown. The forewings have brown kidney-shaped pattern and ring pattern. The kidney-shaped pattern has 2 brown lines on the anterior border vein, and the outer side of the kidney pattern has brown wide transverse bands. There are black spots between the veins in the end area. The hind wings are light brown to yellow-white, and the end areas are black or dark brown. Egg hemispherical, 0.44-0.48mm, colostrum white-yellow, dark purple before hatching. The body length of larvae is 30-42mm, and the body color varies greatly from food to food or from environment to environment, ranging from light green, reddish to reddish brown or dark purple. Green type and red brown type are common. Green type, green body, dark green topline and subline, valve line light yellow, body surface covered with brown or gray spines. Reddish-brown type, reddish-brown or reddish-brown, pale brown on topline and sub-stratum line, white valve line, and black tufts. The ventral toe hook is a double-order middle belt, and the two anterior thoracic hair lines are tangent or intersect with the lower end of the thoracic valve. The 17-17mm long, yellow-brown, abdomen on the back of the 5-7th section and the abdominal mask 7-8 rows of semi-circular engraved points, Hippophae spiny hook 2nd, tip microbend.
Living habits Inner Mongolia and Xinjiang are born 3 generations, 4 generations in North China, 5-7 generations in the south of the Yangtze River Valley, wintering in the earth with earthworms, and feathering when Hunchun temperature exceeds 15°C. In mid-April, North China began feathering, and in mid-May, it entered the peak of emergence. The first generation of eggs is seen from late April to the end of May. The first generation of adults is seen from early June to early July. The middle of June is the peak period. In July, the second generation of larvae is at the heyday. In late July, it enters the second generation of adult emergence and spawning. During the period, the 4th generation eggs were seen from late August to early September. The hatchling larvae passed the winter and matured in mid-October. The first generation was mainly affected by early spring crops such as wheat, peas, and sorghum. The second and third generations were affected by cotton, and the third and fourth generations were harmful to tomatoes and other vegetables. Since the first generation, the fruit trees were damaged and they were heavy at the later stage. Adults grow nocturnal, and tend to be strong towards the black light. Willow branches have a trapping effect on adults. Eggs are spawned on young leaves or fruits. Each female produces 100-200 capsules. grain. The spawning period lasts 7-13 days, and the egg period is 3-4 days. After hatching, the egg shells are eaten first. After peeling, the skin is eaten first. The youngest insects eat fresh leaves. The fruit after the 2nd instar has large pods, and the insects are excreted. , There are metastasis habits, larvae 15-22 days, a total of 6 instar. After getting into the soil after aging, phlegm at 3-9cm. 8-10 days in the flood season. The worms are lovable and warm and wet. Adults lay their eggs at an optimum temperature of 23°C and rarely lay eggs below 20°C. Larval development is most suitable at 25-28°C and relative humidity of 75%-90%. The influence of humidity in the north is even more pronounced. Monthly rainfall above 100mm and relative humidity above 70% are seriously harmful.
Prevention Methods (1) Do a good job of forecasting. (2) Agricultural control. Using straw ring method, soak straw or wheat straw to form a grass ring with a diameter of 1.5-2cm. Before the oviposition of the adult H. armigera and before the third age of the larva, use the monocrotophos, A. Ammonium phosphate, Wan Ling and other insecticides were immersed with dichlorvos at a ratio of 1:1 and soaked in a 500-fold solution. Can also use monocrotophos, methamidophos dubbed 500-800 times liquid coating, control 3rd instar larvae.
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