Fotoperiyodun Acanthoscelides obtectus Say (Coleoptera: Bruchidae)’un gelişim süresi, eşey oranı ve verimine etkisi

Abstract

In the trials, the influence of photoperiod on the development time, sex ratio, and fecundity of Acanthoscelides obtectus were examined. The trials were carried out in five different photoperiod regimes including 0L:24D [continuous darkness (CD)], 6L:18D (6 hours of light, 18 hours of dark), 12L:12D (12 hours of light, 12 hours of dark), 18L:6D (18 hours of light, 6 hours of dark), 24L:0D [continuous light (CL)] with a temperature of 25±2 ºC and 60±5% relative humidity. The shortest pre-adult development time was determined under CD conditions. While the development period lasted 26.33±0.88 days under CD conditions, it lasted for 35.33±0.66 days under CL conditions. Although the sex ratio did not differ much, CL conditions were in favor of males. The lowest female fecundity was determined under CL and 18L:6D conditions. Fecundity did not differ significantly under CD and 6L:18D, while it decreased significantly under 12L:12D, 18L:6D, and CL conditions. Especially, when CL and CD were compared with each other, statistically significant difference was observed.