Effects of Yellow Sticky Trap and Chemical Insecticides for the Management of Leaf Beetle and Whitefly on French bean

Abstract

A field experiment was conducted to evaluate the effectiveness of yellow sticky trap and chemical insecticides for the management of leaf beetle and whitefly on French bean during December 2017 to January 2018. Results revealed that the lowest incidence of leaf beetle (0.70) was recorded in plot treated with Nitro 505EC @ 1 ml/L of water (T2) and the highest incidence of leaf beetle (1.46 to 2.28) was found in untreated control plot (T7). The percent reduction of leaf beetle over untreated control was higher (63.73%) in the treatment T2. The lowest percent infested plants per square meter (0.67%) was recorded in plot treated with Nitro 505 EC @ 1 ml/L of water (T2) while the highest percent infested plants per square meter (100.00%) were recorded from untreated control plots (T7) on 15 January 2018. After 10 days of 1st and 2nd application of treatment, the lowest percent leaflet damage per 5 plants (20.98% and 24.80%, respectively) was recorded in plot treated with Nitro 505 EC @ 1 ml/L of water (T2) followed by T4 (Bioneem plus 1 EC @ 1 ml/L of water) treated plot (24.17% and 34.45%, respectively) while the highest percent leaflet damage (100.00%) was recorded from untreated control plot (T7). No leaflet area damage was observed in plot treated with Nitro 505 EC @ 1 ml/L of water (T2) and the lowest percent leaflet area damage (8.67%) was observed in plot treated with T4 and the highest percent leaflet area damage (11.33% to 26.67%) was recorded from untreated control plots (T7) on 26 December 2017, 5 and 15 January 2018. Considering the mean number of whitefly of all the periods, the lowest incidence of whitefly (0.79) was recorded in T4 treated plot and highest incidence (3.27) was in untreated control plots (T7).The percent reduction of whitefly over untreated control was highest (75.84%) in the treatment T4. In conclusion, Nitro 505 EC @ 1 ml/L of water was found to be the most effective for chemical control of leaf beetle and Bioneem plus 1 EC @ 1 ml/L of water was the most effective for chemical control of whitefly on French bean.