Studies on frequency distribution of Arthrobotrys oligospora, a potential biocontrol agent of plant parasitic nematodes in district Allahabad

摘要

Arthrobotrys oligospora is one of the most important predaceous fungi occurring widely in different types of soil. This fungus produces the hyphal bails and network compound. This hyphal nets as trapping structure which may be single dimensional to two or three dimensional and are formed through repeated hyphal anastomosis, which capture nematodes either through the adhesive material present on the surface of hyphal nets or due to physical entanglement. When moving nematodes pass through such hyphalbails, they are captured by sticky substances present on the bails. Such nematodes struggle violently to escape the capture but they are usually entangled at several places of their body. They absorb the nutrients and finally kill the nematodes. This predaceous fungus was present in the soil samples which were collected from the different locations of Allahabad district where vegetable crops are cultivated. The predominant occurrence of this fungus was recorded in the field where there was less occurrence of root knot disease.