In recent years, many areas of our province such as Spodoptera exigua, Spodoptera litura and other noctuid moth pests occur seriously, and production generally reflects the poor control effect of common insecticides. What happened to this year's night moth pest? How to control nocturnal insect pests? The reporter interviewed Yang Rongming, a researcher at Jiangsu Plant Protection Station, on these issues. According to Yang Rongming, Spodoptera exigua, Spodoptera littoralis, and other noctuid moth pests are migratory pests, and are occasionally strong. Inter-regional and annual differences occur widely, with high-temperature and drought-prone outbreaks occurring in summer and autumn. Nocturnal insect pests of our province occurred mildly in 2009 and occurred severely in 2010. In recent years, nocturnal moth pests have maintained a moderately heavy occurrence level in Zhejiang and Shanghai. In general, the occurrence and harm of these two pests have been significantly heavier in recent years than in the 1990s. Due to the continuous expansion of facility cultivation area, there are many types of crops in the field and there are abundant foodstuffs, which are favorable to the growth and reproduction of the noctuid moths. It is expected that the occurrence of Spodoptera exigua and Spodoptera litura in our province this year will be similar to that of last year, and will reach the level of priority. The seriousness of the nocturnal moth pests mainly depends on the climatic conditions in summer and autumn. In summer and autumn, high temperatures and droughts occur, and heavy weight occurs. On the contrary, it occurs lightly. "Production of Spodoptera exigua, Spodoptera littoralis, and other noctuid moth pests is difficult to control. The main reason is that the use of drugs is lagging. When it is found to be harmful, it often misses the appropriate period of control, field generation overlap, adults, old larvae, young larvae and eggs. At the same time, the effect of medication is poor," Yang Rongming said. Nocturnal moth pests should be caught in the peak period of young larvae, do not use pesticides before dispersion hazards, and timely pay attention to the monitoring notices and prevention and control advice issued by the local plant protection department, so that appropriate medication. Nocturnal insect pests occur many times per year, occur in large quantities, and have strong resistance to stress, and are prone to outbreaks. In some areas, pesticides such as pyrethroids and organophosphorus pesticides have been repeatedly used for a long period of time, causing pests to produce strong resistance to these drugs and have poor control effects. According to the production practices in recent years, chlorantraniliprole, ethosyl spinosyn, tebufenozide, indoxacarb, chlorfenapyr and other drugs have a good control effect against nocturnal insect pests. Attention should be paid to alternate medications. Delay the development of pest resistance. According to the characteristics of nocturnal insect pests that have nocturnal emissions, spraying should be conducted in the evening. In addition to uniform spraying of plants, the ground near the roots of the plants must be sprayed to prevent larvae that fall to the ground from leaking. Improve control effectiveness. In addition, nocturnal insect pests prefer to spawn eggs on vegetables such as cabbage and Chinese cabbage. Manual removal of egg masses can effectively control the damage. Adult attractants and traps in the field during the period of adult emergence can trap and kill a large number of adults, significantly reducing the degree of occurrence.
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