DOI: 10.36347/sjavs.2018.v05i11.003

Pages: 595-600

Abstract: A survey was conducted at Nintavur and Uhana DS areas of Ampara District to evaluate the factors associated with the controlling of Brown Planthopper in paddy fields during its out breaking condition and the measures on the adopted controlling mechanisms. Among the BPH outbreak experienced farmers in 2018 Yala, 50 farmers were randomly selected and interviewed through structured pre-tested questionnaires. Generated responses were analysed using descriptive statistics. Most of the farmers (80%) identified BPH outbreak at 46 to 66 days after sowing of paddy with the visible symptoms such as yellowing (40%), lodging and hopper burn (60%). About 88% of the farmers relied solely on pesticides used to control BPH outbreak. Further, the farmers used variety of pesticides belongs to various chemical groups with various formulations such as sulfloxyflor 50% WG, Carbosulfan 20 SC, Imidaclobrid 70% WG and Ethiprole 10 SC. By altering the mode of action, famers used different combinations of said chemicals. Out of all combinations, majority of the farmers (56%) reported that Carbosulfan 20 SC+ Sulfloxyflor 50% WG (Transform TM) followed by Imidaclobrid 70% WG +Sulfloxyflor 50% WG (24%) and Ethiprole 10 SC+ Sulfloxyflor 50% WG (8%). The average yield obtained during this outbreak was 45 to 60 bushels per acre by 56% of farmers followed by 61 to 71 bushels per acre by 36% of farmers. Therefore, it could be concluded that the controlling of BPH during outbreak could be achieved by choosing pesticides those have completely different mode of action till realize the acceptable one for minimizing the effects. Further, combination of pesticides which has the active ingredient of sulfoxyflor 50% WG (4C Sulfoximines) would be the best solution for controlling BPH outbreak out of available chemicals in the market.