Pathogenicity of Heterodera cajani on cow pea as influenced by the presence of vam fungi, Glomus fasciculatum or G. eplgaeus*

Effect of Heterodera cajani and Glomus fasciculatum or G. epigaeus on growth of cowpea var. Pusa Dofasli in concomitant occurrence was largely independent of each other and the organisms did not modify the effect of others to any considerable extent. However, an increase in nematode inoculum invariably resulted in reduced root infection and spore production by the mycorrhizal fungi. The presence of G. fasciculatum showed a profound adverse effect on cyst production and nematode multiplication, while G. epigaells tended to exhibit a reverse trend.