Co-Authors:
Steinberg, S., Department of Entomology, Hebrew University of Jerusalem, Faculty of Agriculture, P.O. Box 12, Rehovot, Israel
Podoler, H., Department of Entomology, Hebrew University of Jerusalem, Faculty of Agriculture, P.O. Box 12, Rehovot, Israel
Applebaum, S.W., Department of Entomology, Hebrew University of Jerusalem, Faculty of Agriculture, P.O. Box 12, Rehovot, Israel
Abstract:
The effect of four prediapause temperatures (18, 22, 26 and 30 °C) on the photoperiodic response of the codling moth, Cydia pomonella (L.), was studied under controlled conditions. The highest rates of diapause were recorded, for all day‐lengths, at temperatures of 22 and 26 °C while relatively lower rates of diapause were elicited at 18 and 30 °C. The same trend was demonstrated by projecting the values of the critical photoperiod which induces 50% diapause (= CPhP50) over the prediapause temperature. The change in diapause incidence as a function of photoperiod, at all prediapause temperatures, exhibited a response characteristic of long‐day insects, i.e. high rates of diapause at short days (12–13.5 h) and a decrease in diapause incidence at long days (14–15 h). The results for temperatures 22, 26 and 30 °C support the view that lower prediapause temperatures enhance diapause induction, at a given photoperiod, while higher temperatures tend to avert or diminish the process. On the other hand, the low rates of diapause obtained at 18 °C contradict this view. Nevertheless, high correlation was found between the laboratory evidence and field data, indicating the adaptability of the Israeli codling moth to subtropical climate. 1992 The Netherlands Entomological Society
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