Entomopathogenic Nematode Wettable Powder (NEMA DOA50 WP) to Control Striped Flea Beetle in White Radish

Abstract

       The study focused on the application of the entomopathogenic nematode Steinernema carpocapsae water-soluble powder formula, NEMA DOA 50 WP, to control the striped flea beetle (Phyllotreta sinuata Stephen) in white radish. The objective of this study was to determine the optimal rate and timing for the application of NEMA DOA 50 WP to control the striped flea beetle under field conditions. The research spanned two years and was conducted in the U Thong district area of Suphan Buri Province. In the first year (February to April 2022), a study was conducted on the rating application for the pouring technique of NEMA DOA 50 WP every 7 days. The experimental design employed a randomized complete block (RCB) with six treatments and four replications ranging from 130 to 280 mg./m², alongside water and an untreated control. After applying NEMA DOA 50 WP seven times, the results indicated that the 230 mg./m² rate showed the best tendency to control the striped flea beetle in field conditions. The second-year study (January to March 2023), specifically focused on the timing application for the pouring technique of NEMA DOA 50 WP, utilizing the 230 mg./m² rate from the previous study. The experimental design employed RCB with five treatments and four replications (including pouring every 5, 7, and 10 days, as well as water and a non-treated treatment). The results showed that applying NEMA DOA 50 WP at 230 mg/m² every 5 days, the number of striped flea beetles and damage white radish were less than the other treatment with statistically significant at 0.05.