Scientific name Trachea tokionis (Butler) Synonyms Agrotis tokionis Butler Lepidoptera, Noctuidae. Alias ​​black worm, silkworm, silkworm, cutworm, cutworm. Distribution from the north of Heilongjiang, Inner Mongolia, south to Fujian, Jiangxi, Hunan, Guangxi, Yunnan.
Host
Seedlings of vegetables, corn, tobacco, cotton, fruit trees.
Damage characteristics
See small tigers.
Morphological characteristics
Adult body length 20-22mm, 45-48mm wingspan, head, chest brown, black lips on the outer side of the lower lip section 2, a dark horizontal line in the middle of the neck plate. Abdomen, forewing grayish brown, inside front outside area, dark brown in the middle room, double brown base line in middle Asian pleats, inside horizontal wavy, double black, narrow dark edges of sword pattern, ring pattern with black Round-brown, kidneys with black sides, brown, lateral with 1 dark spot near horizontal, brown with horizontal lines, jagged double lines outside, horizontal line, serpentine light brown, marginal line A black point, light yellowish brown hind wings. Egg hemispherical, egg length 1.8mm, height 1.5mm, yellowish-brown after the early light yellow, grayish brown before hatching. The mature larvae are 41-61mm long, yellow-brown, with many wrinkles on the surface, and the particles are not obvious. The head is brown, with 1 pair of dark brown vertical stripes in the center, and the frontal (lip base) triangle. The base is larger than the hypotenuse, and the size of each abdominal segment 2 is similar to that of 1 hair slice. The valve is long oval black, except that the bottom of the two bristles is yellowish-brown near the end of the bristles, almost all dark brown, and full of cracked wrinkles. The dragonfly is 23-29mm long, light yellow at the beginning and yellowish-brown at the end.
Habits
In the first year of life, larvae overwintered the top soil layer in the fields and weeds and green manure fields. The Yangtze River valley was unearthed in early March. It entered the stage of damage in early May. When the temperature is higher than 20°C, it diapauses in summer and begins to phlegm in mid-September. Embryated as adults in the mid-October. Each female can lay 1,000 eggs, 11-24 days of egg period and more than 300 days of larval period.
Control methods
(1) Forecast and forecast. The adult insects can be monitored by using black light or honeysuckers, which are set in the spring in North China from April 15 to May 20. If there are more than 5-10 moths per day per day, it means entering the moth In the period, the day with the most moths is the peak period. After 20-25 days, it will be the 2-3 larvae larvae. It will be the appropriate period for prevention and control. If the moth traps are more than 30 for two consecutive days, the omen will have great occurrences. may. The larvae are measured by field survey methods. For example, there are 0.5-1 larvae per m2 before culturing, or 0.1-0.3 larvae per m2 after culturing (or one in 100 vegetable seedlings). 2) that should be controlled.
(2) Agricultural control. The removal of vegetable fields and surrounding weeds in early spring to prevent oviposition of adult tigers is a key aspect. If one has been spawned and found 1-2 instar larvae, weeding should be used after spraying to prevent individual larvae from being buried. The weeds removed should be removed from the vegetable fields and treated with manure.
(3) trapping and prevention.
One is black light trapping adult worms.
The second is the trapping of adult sweet and sour liquid: 6 parts sugar, 3 parts vinegar, 1 part liquor, 10 parts water, 9 parts of trichlorfon and mix thoroughly, or add appropriate amount of pesticide with spore water, set in the adult stage, both Trapping effect. Some fermented and sour foods, such as sweet potatoes, carrots, rotten fruits, etc., can also be trapped to kill adult worms by adding an appropriate amount of medicine.
The third is bait trapping larvae (see è¼è›„).
The fourth is to trap grass and kill larvae: Before the planting of the seedlings, the ground tigers only feed on the weeds in the field, so they can choose to eat gray ash, spiny vegetables, bitter vegetables, small flowers, alfalfa, and wormwood. Weeds, such as barley, imperata, and geese, are trapped to trap larvae of earthworms, either by artificial capture or by poisoning with chemicals.
(4) Chemical control. The 1-3 larvae of ground tigers have poor drug resistance and are exposed on the host plants or on the ground. They are suitable for chemical control. Spray 40.7% poisonous holm oak oil per 667m290-120g water 50-60kg or 2.5% deltamethrin 3000g, 20% fenvalerate 3000x, 20% chrysantha oil 3000x, 10% bromine Horse cream 2000 times, 90% trichlorfon 800 times or 50% phoxim 800 times. In addition, 3% of Merrill granules can also be used, and the soil can be treated with 2 to 5kg per 667m2. For details, see Mesh A.
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