Optimum Thermal Regimes for Adult Storage of Scylnnus coccivora Ayyar (Coleoptera: Coccinellidae)

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Authors

  • Department of Agricultural Entomology Agricultural College and Research Institute (TNAU) Madurai 625 104, Tamil Nadu ,IN
  • Department of Agricultural Entomology Agricultural College and Research Institute (TNAU) Madurai 625 104, Tamil Nadu ,IN

DOI:

https://doi.org/10.18311/jbc/2006/3914

Keywords:

Fecundity, Longevity, Scymnus coccivora, Survival, Thermal Requirement.

Abstract

Adults of Scymnus coccivora Ayyar (Coleoptera: Coccinellidae) were stored in five different temperature regimes of 5, 10, 15, 20 and 29°C along with 50 per cent honey as adult food, and the percent survival and fecundity at weekly interval were recorded during September - October 2004 in the weather condition of 31.9 ± 2.2°C and 68.8 ± 7.1 per cent relative humidity at Insectary, Department of Agricultural Entomology, Agricultural College and Research Institute, Madurai. The adult survival was 81.7 and 31.7 per cent on 35th and 56th day after storage, respectively when stored at 15°C. Adults of S. cocciwJra drawn from 20°C continued to lay eggs for up to 49 days which were 28.4, 23.4, 18.O, 15.4, 12.7, 7.4 and 4.0 eggs/female on 7, 14, 21, 28,35, 42 and 49th day after storage, respectively. Temperature at 20 and 15°C were favourable for the storage of adults with survival for prolonged period while 5 and 10°C were detrimental to survival and fecundity.