Corn borer is the main pest on corn. It occurs three generations a year, and it is more harmful in the second and third generations. The control of corn borer mainly relies on chemical pesticide spraying or toxic soil, and the use of chemical pesticides poses a threat to the quality of agricultural products and the safety of ecological environment.
First, the corn borer hidden damage, prevention and treatment of difficult
Corn borer is commonly known as borer, drill stemworm, heartworm, etc., and the mature larvae overwinter in the host stalk, cob and root stalk, and spring sputum in the next year, the adult fly strong, and phototaxis. In the corn leaf stage, most of the newly hatched larvae of corn borer crawl into the heart leaf, and gather the heart leaf flesh to leave a white film-like epidermis, which is in the shape of a flower leaf; the second and third instar larvae are hidden in the heart leaf, the heart After the leaves are unfolded, neat rows of holes appear; after four years of age, they continue to break into the stalks and continue to harm. A large amount of dung is often piled up in the pupil, and the stem is easily broken from the pupil when it encounters wind. Due to the destruction of stem tissue, affecting nutrient transport, corn is prone to premature aging, and in severe cases, the ear is poorly developed and the grain is not full. In recent years, the occurrence of corn borer has been increasing year by year, but because the young larvae of corn borer are hidden in the heart leaf, they continue to invade into the stem after the fourth age. This harm is not conducive to the application of the agent, increasing the difficulty of prevention.
Second, promote the "three major prevention and control technologies"
In response to the pesticide reduction technology system for prevention and control of corn mash, we should vigorously promote the use of “three major technologies†for reduction and control, and reduce the amount of prevention and control. “Three technologies†integrates “T. sinensis parasitic corn glutinous + sex attractant to trap corn glutinous rice. + Solar insecticidal lamps trap corn borer and other technologies.
1. Direct economic benefits
Applying the technology of Trichogramma release, the yield loss of 30 kg can be recovered, the chemical pesticide dosage per mu is reduced by 0.24 kg, the total investment per mu is 3 yuan, and the labor is saved by 95%. The physical and chemical trapping technology (sex trap) + solar insecticide Light) The recovery of production loss is 2 kilograms, the amount of chemical pesticides is reduced by 0.01 kilograms, the total investment of mu is 5 yuan, and the labor is 30%. Through the application of pesticide reduction technology system, the use of chemical pesticides is reduced by 0.25 kg.
2. Social and Economic Benefits
The use of pesticide reduction technology system can not only continuously control pests below economic hazard levels, but also reduce the use of chemical pesticides, reduce environmental pressure, and contribute to ecological balance and a virtuous cycle of ecosystems. Green Beijing and Beautiful Beijing provided good technical support. Through the promotion and application of this technology, the natural ecological environment of farmland has been significantly improved, and the environmental quality and the safety level of agricultural products have been significantly improved, which indirectly saves the cost of national environmental pollution.
3. Specific technical measures
(1) Trichogramma Control Technology
The parasitic natural enemies Trichogramma are used to produce eggs into the eggs of the pests, and then the eggs are killed by absorbing nutrients. During the early stage of spawning, the Trichogramma can be released from the eggs of the Trichogramma to 1 to 3 times, and 1 to 20,000 heads per acre.
(2) Sexual attractant trapping technology
The use of artificially synthesized insect (female) sex hormones (estro pheromone) to trap male adult corn borer, prevent mating and spawning, and achieve the purpose of controlling the number of corn borer. During the prevention and treatment, 2~3 sets of sexual traps are placed per acre, and the height of the plants is 20 cm or more. The lure needs to be replaced every 4~6 weeks.
(3) Solar insecticidal lamp trapping technology
It has the characteristics of labor saving and pollution-free, can kill a large number of adult corn borer insects, and effectively reduce the number of subsequent pest populations in the field. This technology has obvious effects in controlling adult corn borer. According to preliminary calculations, each solar insecticidal lamp has a growing season. It can trap more than 1000 adult worms of cotton bollworm, about 7 kg.
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