Heat Unit Requirements for Development of the Pink Bollworm Pectinophora gossypiella (Saund.) | ||||
Egyptian Academic Journal of Biological Sciences. A, Entomology | ||||
Article 10, Volume 4, Issue 1, June 2011, Page 115-122 PDF (452.49 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/eajbsa.2011.15176 | ||||
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Authors | ||||
Yones M. S.1; Abd ElRahman H. A.2; Abou Hadid A. F.3; Arafat S. M.1; Dahi H. F.4 | ||||
1National Authority for Remote sensing and Space Sciences (NARSS), 23, Josef proztito St. Elnozha Elgedida - P.O. Box 1564 Alf maskan Cairo, Egypt | ||||
2Faculty of Science, Ain Shams University, Egypt | ||||
3Minstry of Agriculture, Egypt | ||||
4Plant Protection Research Institute, Giza, Egypt | ||||
Abstract | ||||
The present study was carried out under four constant temperatures (20, 25, 30 and 35°C each ± 1°C) when the Pink Bollworm, Pectinophora gossypiella (Saund.) larvae,were fed on artificial diet. The time required for embryogensis, larval duration and pupal duration decreased as the temperatures increased from 20 to 35°C. The lower thresholds of development (t0) were 9.91, 14.07, 9.57 and 12.18°C for eggs, larvae, pupae and pre-oviposition period, respectively. The average accumulated heat units required for development was 72.11, 166.38, 248.70 and 26.83degree-days for egg, larvae, pupae and pre-oviposition period, respectively. The lower threshold of development (t0) to complete a generation was 12.03°C. The average accumulated heat units required for a generation was 499.71 degree-days. The kind of food had non-significant effect for heat requirements. The thermal units required to complete the development of different stages to complete one generation, as well as helping in the design of development indexes, determining the times required for these stages under fluctuating temperatures in field and forecasting system for establishment and develop the non chemical methods for the pink bollworm IPM program. | ||||
Keywords | ||||
Heat Unit; pink bollworm | ||||
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