Decrease of nematode population by introduction of nematophagous fungi into the soil as affected by inoculum concentration and temperature in vitro
1988
Kim, H.K. | Jeong, M.J. | Choo, H.Y. | Park, C.S. (Kyongsang National Univ., Jinju (Korea R.). Dept. of Agricultural)
Five nematophagous fungi were evaluated for their nematicidal effect in vitro on Rhabditis sp. and Meloidogyne hapla in soil. Inocula of Arthrobotrys arthrobotryoides, A. conoides, A. oligospora, Dactylella lobata, and Fusarium oxysporum were grown in moistened cornsandy soil and chopped potato-sandy soil media, and icubated at 26deg C for one week. The prepared inocula were incorporated in autoclaved sandy soil, mixing throughly at rates equivalent to 1:50, 1:100, 1:200, and 1:400, respectively, before 80g of the mixture carrying 100 Rhabditis sp. was put into petri plates. Nematophagous fungi effectively reduced the population of Rhabditis sp. in soil in a week or two, following treatment of the inocula at concentration of 1:50 and 1:100. The Rhabditis sp, population in soil decreased significantly at temperature ranging from 15 to 30deg C. The optimum was 25deg C for nematicidial effect as high as 80-100%. All fungi infected the M. hapla effectively in soil, causing more than 90% mortality within one week. This result indicated the potential value of these fungi as promising biocontrol agents
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