Abstract:
The efficacy of HtCRMH isolate of Hirsuteha thompsonii Fisher a fungal Pathogen of eriophyid mites was evaluated in tests with its culture filtrate against citrus rust mite, Phyllocoptruta oleivora Ashmead and two spotted spider mite, Tetranychus urtieac koch. The results revealed that the crude filtrate obtained from 14 days old broth culture of HtCRMB isolate was toxic to citrus rust mite. Mite mortality inceased from 41.99 to 55.90%, 1, 3 and 9 days after treatment, but mortality decreased with serial dilutions of the crude filtrate. Similarly, culture filtrate of HtCRMB isolate was found to be toxic to the two spotted spider mite, maximum mortality, 27.97%, was observed eight days after treatment. The mycelia suspension induced highest mortality (57.70%) compared to undiluted filtrate (27.97%). The filtrate of culture, which was 20 days old and had high mycelia production, (0.721 g dry wt/50 mL) induced higher mortality (44.68%). Hence there is a positive correlation between age of the culture, mycelia production and toxicity.
Page(s):
276-279
DOI:
DOI not available
Published:
Journal: International Journal of Agriculture and Biology, Volume: 8, Issue: 2, Year: 2006