How to prevent white edge tiger
The scientific name Euxoa oberthuri Leech belongs to the order Lepidoptera, Noctuidae. Alias ​​white edge cutworm, white edge cutworm. Distribution in Qinghai, Heilongjiang, Inner Mongolia, Guizhou, Yunnan, Xinjiang, Jilin, Hebei, Sichuan, Henan and other provinces.
Host
Spinach, broad beans, peas, beans, soybeans, tomatoes, eggplant, endives, corn, beets, bitter vegetables, psyllium, alfalfa, and flax.
Damage characteristics
The seedlings were cut off from the ground, and the main stems sclerced to climb up to the upper part of the growing point, and the lighter ones caused the lack of seedlings and ridges, while the others were destructive.
Morphological characteristics
The adult body is about 10mm in length, the wingspan is 40mm, and the head, chest is brown, and there is a black line in the middle of the neck plate. The belly is dark brown. The front wing is brown, the front area is light brown and white, and the baseline is black and black. The inside line is black and wavy. The black side of the sword pattern is elongated, the ring pattern and the kidney pattern are gray with black edges. Each center has brown lines, and the outer lines are thin. Zigzag outer bend, black, darker outer line and kidney pattern, ring pattern, interrenal groove and ring pattern medial mid-chamber black, subjacent line irregularly jagged, light brown, medial front, middle medial Black lines, margin hair black; hind wings light brown, margin hair white. The eggs are milky at the time of first production, and after 2-3 days, brown markings appear on the egg shells and become gray-brown after 7-8 days. The mature larvae were 35-40 mm in length, 2.5-3 m2n in head width, brown in the head, and marked with "eight" lines. The cranial region had many brown patches and one dark spot consisting of small black spots. The lip base is approximately equilateral triangle. The frontal area reaches the cranial cranial, slightly bimodal, and the cranial mesothelium is short. The body is yellow-brown to gray-brown. The surface is smooth without particles, the subline is darker, and the valve is oval. Valve black. There are 15-22 toe hooks in the abdominal foot, 18-25 hip-toe hooks, and the proximal base of the hip plate and the toe-toe are darker. The small black spots are mostly concentrated in the base and are double curved. The larvae were 7 instar. The cockroach is 18-22mm long, yellowish-brown, and there are many small engraved points and tail-stabs on the leading edge of the 3-7 abdominal section.
Habits
In Heilongjiang, Inner Mongolia, Hebei and other places, they are born 1 year old. Late larvae with late embryo development or no shelling are overwintered in eggs or diapause eggs under fields, lands, forests or grasses. Egg period 240-270 days, larvae hatch in mid-April of next year, the newly hatched larvae are resistant to low temperature and hunger, and have strong resistance to bad environment; after 3rd age, they are buried in the soil, and after mid-May, the larvae of flax are transferred to flax to damage. Until mid-June, the larvae lurked under the soil surface during the day, feeding after dusk, and the larval period was about 57-62 days. The mature larvae were buried in the soil from 10cm to 10cm in the late June to mid-July. Aphidius esculenta, about 20-22 days in the flood season, become adults at the end of June and early July. Adults live for 12 days. During the period of July-August, they enter the peak of the moth. Adults grow nocturnal, have a strong tendency towards black light, and have a lot of eggs. Around the earth seams or weeds, 200-330 eggs are laid by each female, and the oviposition period is about 20 days. After the eggs have matured by 7-18 days, the overwintering season occurs. The severity of this worm was related to the pre-cockroach and the environment. The former locust was a plot with lots of weeds such as vegetables, wheat, and wheat, and the leeward sunny or forest-bearing plot near the ridge was vulnerable.
Control methods
(1) Autumn fall, spring turn to kill eggs.
(2) Timely early sowing, eliminate field weeds.
(3) Using adult chemotaxis to trap adults with sweet and sour liquid: 6 parts of sugar, 3 parts of vinegar, 1 part of white wine, 10 parts of water, 1 part of 90% trichlorfon and mix thoroughly, or add appropriate amount of pesticide with spore water, Adult setting period, 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 second is bait trapping larvae. The third is the trapping of larvae by grass: before the seedlings are settled, the tigers only feed on the weeds in the field. Therefore, they can choose to eat gray ash dishes, spiny vegetables, bitter leeks, small flowers, alfalfa, ivy, green Grasshoppers such as cockroaches, imperata, geese and other weeds are stacked to trap larvae of earthworms, or they can be captured by hand or contaminated 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. Can be used 5% Suppository EC 2000-2500 times, 2.5% deltamethrin or 20% fenvalerate 2000 times, 20% chloramphenicol, 90% trichlorfon 800 times, 50% symplectic Phosphorus EC 900 times.
(5) With 5% phoxim microgranules each 667m20.75kg or 3% methyl thiophosphate granules 1.5kg, can receive better control effect.
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