Integrated management of rice root-knot nematode, Meloidogyne graminicola with Pseudomonas putida and fluopyram
2022
Haque, Ziaul | Khan, Mujeebur Rahman
Integrated management modules were assessed against rice root-knot pathogen of rice, Meloidogyne graminicola in pot conditions using two proven biocontrol agents (BCAs, Pseudomonas putida AMUPP-1 and Trichoderma harzianum AMUTH-1) and two new nematicides (fluopyram and fluensulfone) on a susceptible rice cultivar Pusa Sugandha-5. Two treatment methods, root-dip (RD) and soil application (SA) were selected, based on the optimization of BCAs and nematicides in a previous experiment. Standard nematicide, carbofuran was also used to compare the efficiency of new nematicides. The plant grown in soil infected with 1000 J2s of M. graminicola suffered a 32–36% suppression in plant growth and grain yield. However, RD treatment with P. putida and T. harzianum combined with SA at 20 days after planting of fluopyram and fluensulfone reduced the adverse effect of the nematode but significantly varied with the treatments. Among the treatments, RD with P. putida followed by SA with fluopyram proved most efficacious and reduced the root-knot severity by 68–75% and reproduction factor by 81% resulted in a 34–40% plant growth promotion and yield enhancement by 57–72%. RD with P. putida and SA with carbofuran was next in effectiveness trailed by RD with T. harzianum + SA with fluopyram and RD of P. putida + SA of fluensulfone. The comparative effectiveness of RD with T. harzianum and SA of fluensulfone was found lowest in decreasing rice root-knot severity and plant growth promotion. The study demonstrated that the application of fluopyram will provide an alternative chemical for the control of M. graminicola in the scenario of carbofuran being banned.
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