Abstract:Biology of two aphid species, Rhopalosiphum padi (L) and Macrosiphum miscanthi Takahashi, was studied on excised wheat earheads at room temperature during late February to mid-April 1999 at Delhi. R. ...Biology of two aphid species, Rhopalosiphum padi (L) and Macrosiphum miscanthi Takahashi, was studied on excised wheat earheads at room temperature during late February to mid-April 1999 at Delhi. R. padi underwent four nymphal instars with mean total nymphal period of 4.92 days and adult longevity of 7.85 days, with mean pre-reproductive, reproductive and post-reproductive periods of 0.70, 6.0 and 0.69 days, respectively. The entire life cycle took 12.87 days. The total fecundity per female was 32.35 nymphs and mean fecundity was 4.53 nymphs per female per day. In case of M. miscanthi a fifth nymphal instar was also formed in some individuals but it did not affect the total nymphal period which was 7.16 days while the adult longevity was 8.68 days. The mean pre-reproductive, reproductive and post-reproductive periods were 1.01, 6.63 and 1.04 days, respectively, while the entire life cycle took 15.18 days. The total fecundity was 21.91 nymphs and the mean daily fecundity per female was 3.26 nymphs. R. padi had comparatively shorter nymphal and total life cycle durations and higher fecundity than M. miscanthi, but the latter species outnumbered the former under field infestation of earheads possibly due to its better adaptability to crowding.Read More
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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