This study on the sorghum spotted stem borer Chilo partellus (Swinhoe) was conducted at the Post Graduate Experimental Field of Department of Agricultural Entomology, College of Agriculture, Campus Latur during 2020-21. The results revealed that C. partellus passed through three generations on rabi sorghum. The mortality in early instar larval stage was observed due to unknown reasons (17.24, 19.05 and 14.51%, respectively), Callibracon sp. (4.16, 11.76 and 8.33%, respectively) and Cotesia flavipes (8.69, 6.67 and 9.65%, respectively) in its first, second and third generations. The mortality in late instar larvae was also found owing to unknown reasons (19.4, 14.28, and 11.36%, respectively), Callibracon sp. (11.76, 12.49 and 11.43%, respectively) and C. flavipes (13.33, 14.28 and 10.26%, respectively) in the first, second and third generations. In first generation, the pupal mortality was not observed, and when noticed it was due to unknown reasons (11.11 and 16.12%, respectively) during second and third generations. The trend index and generation survival were 1.44 and 0.44; 1.48 and 0.38 and; 0 and 0.42 during first, second and third generations, respectively.
The present investigation was conducted on aphid complex at the Post Graduate experimental field of Department of Agricultural Entomology, College of Agriculture, Campus Latur, during 2020-21. The results revealed that the aphid Melanaphis sacchari reached its maximum in 4th SMW (166.66 aphids /plant). Correlation coefficients revealed that none of the weather parameters had significant effect on M. sacchari . Rhopalosiphum maidis reached its peak incidence in 5th SMW (40 aphids/ plant). Correlation studies revealed that the before noon relative humidity correlated positively, while wind speed correlated negatively with incidence of R. maidis.
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