Evaluation of fluopyram against Meloidogyne graminicola in rice

Abstract

Fluopyram, a broad spectrum succinate dehydrogenase inhibitor fungicide as well as nematicide, has a proven record in the control of Meloidogyne incognita and Rotylenchus reniformis. In the present study, effectiveness of Fluopyram was evaluated against M. graminicola, through in vitro and artificial inoculation experiments. In vitro, 0.25 ppm of the chemical recorded maximum juvenile mortality of 94.75 % at 96 h exposure period, while the concentration of 0.01 ppm recorded the lowest juvenile mortality of 14.5 % at the same exposure period. Under artificial inoculation in rice, TN 1, different doses of the chemical were tested along with an untreated control against rice root knot nematode, M. graminicola and it was evident that recommended dose (RD) of the chemical (0.31 μl / kg soil) was effective over other treatments in enhancing plant growth parameters and reducing soil (90.29 %) and root population of nematode (89.80 %). Significant reduction in the microbial biomass carbon (MBC) and Fluorescein Diacetate (FDA) activity were observed during the study period of 15 days due to the application of different doses of chemical. Recommended dose of the chemical recorded higher MBC (346.22 to 269.93 μg/g soil) and FDA activity (4.82 to 3.26 μg FDA/g/h) which was documented to be superior over other treatments throughout the study period