Beware of local damage to three generations of armyworm in corn fields

This year, the second-generation of armyworms in the northeast, north, northwest and most of the southwest of China have occurred lightly. The rainwater in some areas is abundant and the crops are growing vigorously, and high-density populations will be concentrated on crops. According to surveys and monitoring of plant protection stations in the districts and counties of the city, the second-generation armyworm adult trapping amount and the third generation larvae in the field are lower than the corresponding values ​​in the same period of the year. Combined with the comprehensive analysis of the local Corn field ecological environment and weather forecast, it is estimated that the three generations of the armyworm will develop lightly in our city. Local lands may be lighter. Its basis is:

(1) Adult induction: From July 15 to August 3, the city’s average cumulative number of trapped moths was 19, which was significantly lower than the same period of the year (96), and was the second year since 1987 when the second trap was small. . The amount of adults trapped in various districts and counties is not high, and the moth peak day is not obvious. (2) Low amount of larvae in the field: According to the census on August 5, larvae were observed at individual monitoring sites, and the instars were 1-2 instars, with an average of 100 corns and 0.2 insects, and a maximum of 100 insects and 2 insects; There are 0.03 weeds and 0.4 heads per square meter. The density of larvae in all plots was lower than the control index of 30 corn worms and 5 larvae per square meter. (3) The average temperature in mid July to early August was higher than the same period in the first half of the year. The rainfall in late July was more. The severe grass shortage in individual plots will be conducive to the occurrence of armyworm in local plots.

Prevention opinion:

(1) Although three generations of Mythimna separata in our city have occurred lightly this year, Mythimna separata has obvious fulminantness and migration. Its occurrence is greatly affected by weather conditions, especially suitable for local microclimate environments, or the formation of subsidence airflows in the form of precipitation will lead to the migration of a large number of adults to form a phenomenon of concentration damage. All districts and counties should do a good job in monitoring the three generations of armyworms, and the land that meets the prevention and control targets should be immediately organized for prevention and control.

(2) According to the characteristics of the three-generation armyworm larvae firstly feeding on weeds, the land that meets the prevention and control index should be controlled before the larvae transfer to injure corn plants.

(3) Control agents should use high-efficiency, low-residue pesticides such as diflubenzuron and chrysanthemum emulsifiable concentrate. Pay attention to safety when spraying to prevent poisoning and heat stroke accidents.

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