The Regularity Of Spodoptera Frugiperda Occurrence In Taihe County And The Field Control Insecticide Test

Taihe County is located in the northwest of Anhui Province,located in the southern end of the Huang Huai plain,with a total area of 1867 square kilometers.Wheat and corn are important crops in Taihe County.In this paper,through the field investigation,pesticide contrast test,plant protection machinery contrast test,comprehensive prevention and control demonstration,the occurrence degree of S.frugiperda was analyzed,and the scientific and effective prevention and control technology of S.frugiperda was explored.1.There are three to four generations of S.frugiperda in Taihe County,and the fourth generation is incomplete generation.Adults migrate and invade the county from June to July.After the middle of August,the damage of S.frugiperda was serious at the ear stage of summer maize and the growth stage of autumn maize.In September,the generations of adults,eggs,larvae and pupae of S.frugiperda in the field overlapped.Compared with2019,the rainfall increased by 238.95%from June to July 2020,the migration and invasion time of meadow moth was 20 days late,and the damage area decreased by50.75%.2.The experiment of controlling S.frugiperda in maize field was carried out with different insecticides:The larval control effects of spinetoram,chlorantraniliprole,abamectin benzoate,indoxacarb and lufenuron were more than 80%three days after treatment.At 3 days after treatment,the control effects of abamectin benzoate were significantly higher than those of the other four insecticides,more than 90%.On the 14th day after treatment,the larval control effect of lufenuron was the highest,up to 79.93%.It is concluded that the quick effect of emamectin benzoate,Spinetoram and lufenuron is good,the efficacy of lufenuron is relatively good,and the efficacy of emamectin benzoate and spinetoram is stable.In terms of quick effect and sustained effect,abamectin benzoate has the best control effect.It is recommended to use the mixture of abamectin benzoate and chlorantraniliprole,spinosad and abamectin benzoate,spinosad and lufenuron.The control effects of the three mixtures are more than 95%three days after treatment,The control effect of 14 days after treatment was more than 80%.3.The comparison experiment of corn field protection plant showed that the plant protection UAV had better effect than the knapsack sprayer,and the knapsack sprayer was better than the self propelled sprayer.The plant protection UAV with spinetoram 45g/hm~2and water consumption 30L/hm~2had the best control effect on meadow S.frugiperda,and the control rate was 77.94%.