PATHOGENICITY AND HISTOPATHOLOGY OF HETERODERA-CAJANI AND 2 ISOLATES OF FUSARIUM-UDUM ON PIGEONPEA

Two insolates of Fusarium udum, ICRISAT and Local, were tested for pat hogenicity either singly or in combination with the nematode, Hiterode ra cajani, on pigeonpea plant biomass, wilt incidence and H. cajani mu ltiplication. ICRISAT isolate of F. udum was found more pathogenic and caused higher wilt incidence than the local isolate. Wilt incidence a nd reduction in plant growth was also increased in combined inoculatio n of F. udum and H. cajani. Further, the nematode multiplication was a dversely affected in combined inoculation of H. cajani with both the i solates of F. udum. The histopathological studies revealed that the ma in site of entry of F. udum, in nematode and fungus interaction, is th rough the injury created by protruding females of H. cajani.