BIOLOGICAL ASPECTS AND THERMAL REQUIREMENTS OF THE BIRD CHERRY-OAT APHID, Rhopalosiphum padi (LINNAEUS), REARED ON WHEAT SEEDLINGS | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 4, Volume 6, Issue 12, December 2015, Page 1663-1670 PDF (189.38 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2015.75784 | ||||
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| Authors | ||||
| Monira M. El-Fatih; Abeer Mohammad; A. A. Shehawy | ||||
| Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| The bird cherry-oat aphid, Rhopalosiphum padi (Linnaeus) was studied at 15, 20 and 25oC constant temperatures. Wheat seedlings were offered for feeding and maintaining the aphid, R. padi using the Punctured Ependorf Tube Technique. R. padi showed the longest life cycle duration at 15oC as 12.77±1.71days. This duration decreased to 8.36±0.79 and 6.74±0.56 at 20 and 25oC, respectively. The fecundity rate was the lowest (35.41 progenies/female) at 25oC. It was higher at both 15 and 20oC as 50.2 and 53.429 progenies/female, respectively. The longest life span was recorded at 15oC as 49.47±16.43days. This duration decreased to 34.05±6.22 and 19.47±4.16 days at 20oC and 25oC, respectively. The lower developmental threshold (t0) for the R. padi nymphal instars; first, second, third and fourth were 2.216, 6.958, 3.432 and 0.164oC, respectively. The estimated t0 values for the life-cycle and generation time were 3.537 and 3.976oC, respectively. The thermal requirements (K) for each nymphal instar; first, second, third and fourth were, life-cycle and generation time were 45.97, 23.43, 30.97, 47.14, 142.56 and 154.15 dgree-days units, respectively. | ||||
| Keywords | ||||
| Rhopalosiphum padi; biological aspects; heat requirements | ||||
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