Screening of Streptomyces avermitilis Culture Filtrate in in vitro Against Root Knot and Reniform Nematodes

All the culture filtrates of Streptomyces avermitilis tested isolates significantly inhibited egg hatching of Meloidogyne incognita compared to distilled water. The isolate Comp I recorded the lowest larval hatching of 15.3 per cent compared to 67.9 percent in distilled water. The highest concentrations of Comp 1 isolate (1:5) recorded significantly maximum reduction (9.9) in the number of hatched out larvae and also recorded minimum hatching. The isolate Comp 1 recorded the maximum mortality of 83.0 per cent followed by Manp 1 and Comp 6 with larval mortality of 74.1 and 73.2 per cent, respectively. Comp 1 induced 50.5 per cent larval mortality even at six hours of exposure period and induced cent per cent mortality at 72 h of exposure. The isolate Comp I induced maximum mortality of Rolylenchulus reniformis of 71.8 per cent, followed by Manp 1 and Comp 6 which recorded mortality of 70.1 and 66.6 per cent, respectively. The isolate Comp I recorded 54.4 per cent mortality within six hours of exposure and increased to 92.2 per cent larval mortality after 72 h of exposure period.