Field Monitoring on Invasion of and Insecticide Efficacy on Spodoptera frugiperda in Fujian

  Objective  Real-time continuous monitoring on the invasion of fall armyworms (Spodoptera frugiperda) and the insecticide control efficacy in corn fields in Fujian.

  Method  Based on field surveys, a program was designed to continuously monitor the pest invasion and the efficacies of various insecticides. Selected insecticides were sprayed on the stems and leaves of corn plants in the field for the evaluation.

  Result  Fall armyworm infestation was first reported on corn plants in the province on May 6, 2019. Then it spread to many areas, and by November 4, although only corn crops were affected, the disease had affected 53 counties with a total of 646.23 hectares of corn field. The insecticides, including chlorantraniliprole, indoxair conditioningarb, spinetoram, chlorfenapyr, emamectin benzoate, and lambda-cyhalothrin, were tested in the field and found effective in controlling further spread. After application, these agents displayed an efficacy between 88.08% and 91.46% in 3 d, and between 91.41% and 94.01% in 10 d.

  Conclusion  Fall armyworms damaged the corn crops in the province and could currently be controlled by using insecticides as tested.