Influence of red spider mite, Tetranychus macfarlanei Baker and Pritchard infestation on growth and yield of cotton

摘要

Quantity estimation of losses due to red spider mite, Tetranychus macfarlanei Baker & Pritchard release was studied in DCH-32 and NHH-44 hybrids of cotton at Regional Research Station, Raichur. Kamataka. At earlystaye of release, reduction in number ofleaves per plant was more pronounced in DCH-32 as compared to NHH-44. Reduction in leaves per plant was directly related with mite population at 90, 120 and 150 days crop stage. There was no effect of mite infestation on plant height in both the hybrids. Number of fruiting bodies were low at 90 days crop growth compared to 120 and 150 days of mite release. Mite release at 90 days of crop growth recorded lower yield as compared to 120 days and 150 days.