1Department of Agricultural Entomology, University of Agricultural Sciences, GKVK, Bangalore - 560 065, Karnataka, India.
2Department of Entomology, College of Agriculture, Raichur - 584 101, Karnataka, India.
3Agriculture Research Station, Kankanady, Mangalore - 575 002.
The investigation was made during 2004 and 2005 at Zonal Agricultural Research Station, Raichur, Karnataka (160151 latitude, 770201 longitude and 398.4 AMSL). The mean incubation period on CSH 14, CSH 16, and M35-1 genotypes was 9.75±1.25, 9.25±0.75 and 8.35±1.05 days, respectively. The higher nymphal period (18.24±1.93) was observed in CSH 14, while it was 17.75±1.67 and 16.06±2.03 days in CSH 16 and M35-1, respectively. Among the 3 genotypes, variations in pre-mating, mating, pre-oviposition, oviposition, and post oviposition duration was observed. Both macropterous and brachypterous adults were found in each sex and in both the forms, females were nearly one and half times bigger than males. The brachypterous forms of P. maidis were found more fecund compared to macropterous forms in all the genotypes, however, a maximum of 106 eggs was recorded by the brachypterous female on M35-1 as against 84 and 72 eggs in CSH 14 and CSH 16, respectively, and the percentage of hatching was also more on M35-1. The mean total life cycle from egg to emergence of adult was more on CSH 14 and CSH 16 compared to M35-1. The duration of various biological parameters of this pest revealed that, the cultivars M35-1 was highly suitable compared to CSH 14 and CSH 16.
Developmental behaviour, biology, Peregrinus maidis, Sorghum
