Effect of Culture Filtrates of Soil Fungi on the Mortality and Hatching of Reniform Nematode (Rotylenchulus Reniformis)

Culture filtrates of ten common soil fungi showed toxic effect against Rotylenchulus reniformis. Percentage mortality of reniform nematode was directly proportional to the concentration of culture filtrates and exposure period to each filtrate. Rate of mortality was low in the first 24 hours but it appreciably increased with the increase in exposure period. Similarly, different dilutions of fungal filtrates of all the test fungi were hatch inhibitory to a varying degree. There was relative decrease in the larval emergence with the corresponding increase in the concentration of fungal filtrates but interestingly the S/100 concentration of Rhizopus nigricans filtrate significantly increased hatching. Besides fungal filtrates, Richard's liquid medium also exhibited nematoxicity to a certain extent.