Soybean venom moth, also known as bean moth, aircraft poison moth, lepidopteran poison goose, in addition to damage to soybeans, but also harm cotton, persimmon, willow, etc., bean tussock moth commonly occurs in soybeans, larvae eat the leaves, eat nicks, holes The severe leaves were eaten, seriously affecting the growth and development of soybeans, resulting in varying degrees of reduced production.
First, the law of occurrence
The soybean moth adults have phototaxis. The eggs are produced on the back of the leaves. Each egg has 5O-2OO particles. The newly hatched larvae are clustered on the back of the leaf and harmed. Soon, the old mature larvae make a phlegm on the back of the leaves. The bean poisonous geese are Three years in my county, there were three generations. The larvae passed winter, the overwintering adults appeared in early May, and the first generation larvae occurred in the middle and late May. They mainly attacked hosts such as persimmon and willow, etc., and the second generation of eggs. The peak period is in late June. The larva damage stage occurs in mid-July, mid-July and late July. The second-generation adult emerges from the end of July to early August. The third-generation egg begins to appear in early August, and the larval stage is at its height. In the second half of August, the second and third generations in July and August were the main damages in soybean fields in our county. In 2003 and 2003, the damage rate of soybean fields was l2%, and the damage rate of field plots was 17% to 23%. The damage rate of serious plots was over 90%.
Second, the morphological features and symptoms
Adult body length l7-l9 mm, yellow-brown to dark brown, male antennae feather-like, female moth antennae jagged, forewing with two brown and yellow stripes, between the two bands have a kidney-shaped spot, hind wings yellowish band Brown, front and back wings yellow-brown, female moth darker than the male, egg hemispherical, light green, larvae 4O-45 mm long, dark brown head, shiny brown body hair, 8 abdomen, The back of the 4 bundles, each on both sides of the two aircraft like wing, it is called the plane moth, chest full dark brown, each section above the white, brown knot long brown hair, dark brown belly, reddish-brown, long back Long hair, the first 4 sections of the abdomen were also gray knob-like protrusions, leaving only the reticular veins of the victim's leaves.
Third, control methods
(1) Light traps adult worms.
(2) Chemical control
Using the characteristics of young instar larvae concentration damage, spraying 9O% crystal trichlorfon 800 times or 8O% dichlorvos EC 1000 times in the l-3 age, spraying 4O kilograms of liquid per acre, the effect can be up to 90% or more.
(3) Biological control
A large part of soybean is grown as edible vegetables. To protect the ecological environment, reduce pesticide pollution, ensure the health and safety of life, and promote the use of bio-insecticides, it can spray alcohol with 100 billion spores and kill Bacillus bacteria powder 7OO-8OO times. .
The above is the method of controlling soybean moths. I hope I can help you.
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