Peninsula reporter Han Xiaowei
On June 17, peninsula reporters learned from the Municipal Bureau of Agriculture and Rural Affairs that the island city is closely monitoring the invasion and occurrence of grassland moths, so it has carried out "precision" training for farmers and issued technical guidance for prevention and control.
Recently, Jiaozhou Agricultural and Guangdong School held a new type of farmer vocational training in Shahe Community, Puji Town. According to the "precision" training requirements, for the large-scale planting of corn in Puji Town, the focus is on the prevention and control technology of the grassland moth that seriously harms corn.
Grassland nightcrawler is a pest from Africa, in 2017 was included in the world's top ten plant pests "blacklist", highly migratory, this year it drifted across the ocean, through India, through Myanmar, Thailand, smooth landing in China. It can eat, grow, fly, and is extremely harmful. Most of the spring maize in Jiaozhou City is in the seedling stage, which is suitable for grassland night moths to feed as a pest.
Face-to-face instructors in the training sessions recognized and controlled the grassland moth technique, and also distributed sunhats, training materials and school supplies to the trainees. Jiaozhou City is closely monitoring the invasion and occurrence of grassland moths, and strives to achieve "early detection, early warning, early medication, and early extinguishing" to ensure a bumper corn harvest this year.
Peninsula reporters learned that Jimo District issued technical guidance on the control of grassland night moths. If it is found that the grassland moth should be controlled?
In terms of ecological control measures, strengthen field management, implement fitness cultivation technology, and improve the pest tolerance of corn. Excessive use of nitrogen fertilizer is conducive to the grassland nightcrawler feeding and increasing the amount of eggs, and it is necessary to scientifically formulate fertilization to prevent excessive partial application of nitrogen fertilizer. Reasonable combination of corn planting varieties, corn field can be intercropping or flower arrangement planting beans, pumpkin, coriander, bitter vegetables, rue and other plants that have a tendency to avoid pests and natural enemies to attract plants, reduce the amount of grassland night moths.
In terms of physical and chemical enticing and control measures, adult insects are concentrated in the migration period, and the characteristics of the grassland night moth such as phototropism and chemotaxis are used to trap adult insects. Use sexual attractants, insecticidal lamps, food attractants and other methods to trap adult insects, reduce the number of adult populations, reduce the number of eggs laid by adults, lower the base number, and reduce the harm of the next generation.
In terms of biological control measures, measures such as the protection and utilization of natural enemies, the artificial release of natural enemies and the application of biological pesticides are adopted. Some studies have found that the parasitic natural enemies of the grassland night moth include the night moth black egg bee, the island beetle belly cocoon bee, the marginal velvet cocoon bee, etc., and the predatory natural enemies are salamanders, hunting bugs, flower bugs, spiders, ants, grasshoppers, etc., and attention should be paid to protection and utilization in the process of prevention and control. At the young larval stage, various localities can choose biological agents such as cabbage nocturnal moth nucleus polyhedral virus, Thuringiensis, Scarab green zombie, Coccidioides albicans, and Breechella to spray or sprinkle according to local conditions, and continuously control the population of grassland nocturnal moth.
In terms of chemical control measures, the 5-6 years old of the grassland night moth is the binge eating period, and the control should seize the critical period before the 3 instars. The pesticides used in emergency prevention and control can be selected from chlorantraniliprostamide, cypermethrin, bromocyanate, etc. It is necessary to apply the pesticide according to the pesticide use instructions, pay attention to alternate rotation of medication, choose the early morning or evening grassland night moth active feeding stage of the application time, and pay attention to spraying key parts such as corn heart leaves, male ears and female ears.