author(s)
Ananya Dutta, Aparajita Borah, Bornali Mahanta and Pranab Dutta

abstract
Combine effect of root knot nematode, Meloidogyne incognita and soil borne plant pathogen like Sclerotinia sclerotirum with synergistic effect can cause severe crop of many diseases. Indiscriminate uses of chemical have different ill effect. Present study was conducted to study the effect of biocontrol agents and sublethal doe of chemicals for the management of disease complex caused by root knot nematode, Meloidogyne incognita and soil borne plant pathogen like S. sclerotiorum. Seed treatments with T. harzianum @ 5ml/ kg + seed treatment with carbendazim 0.05% w/w + soil application with carbofuran @ 0.5 kg a.i/ha was found to be most effective in increasing plant growth parameters of French bean. The treatment with carbofuran @ 1 kg a.i/ha was found to be best in suppressing the number of galls, eggmasses and final nematode population in soil. Minimum was recorded in the seed treatment with T. harzianum@ 5ml/kg + seed treatment with carbendazim @ 0.05% w/w + soil application with carbofuran @ 0.5 kg a.i/ha.