Compatibility of Pasteuria Penetrans with carbofuran in controlling Heterodera Cajani on cowpea

Compatibility of a near strain of Pasteuria penetrans with a nematicide, carbofuran against Heterodera cajani on cawpea cv. Pusa Komal was studied taking three doses of carboforan viz., 26, 39 and 52 mg (equivalent to 1.0, 1.5 and 2.0 kg a.i./ha, respectively), used singly or in aombination with P. penetrans at 1.0 X 10⁷ spores per pot containing 400 g mixture of soil and river sand in the ratio of 2:l. A significant increase in plant growth was observed when carbofuran at all the three doses was combined with P. penetrans over the corresponding treatments of carbofuran alone. The per cent reduction in cyst production was 97.2, 83.1 and 72.1 in treatments having 52, 39 and 26 mg of carbofuran resepctively, together with P. penetrans compared to 71.4, 66.4 and 44.9 in treatments having 52, 39 and 26 mg of carbofuran alone. Similar trend was observed in the reduction of juvenile population (J2) in the soil. The study indicated the compatibility of P. penetrans with no adverse effect on the growth of bacterium.