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Abd El-Wahab, H., Ebrahim, S., El- Dabi, R. (2009). INFLUENCE OF CONSTANT TEMPERATURES ON THE BIOLOGICAL ASPECTS OF Phthorimaea opercuella (Zeller) AND THERMAL UNITS (DEGREE DAYS). Journal of Plant Protection and Pathology, 34(3), 2191-2197. doi: 10.21608/jppp.2009.122328
Horia A. Abd El-Wahab; Soad A. Ebrahim; Roda M. El- Dabi. "INFLUENCE OF CONSTANT TEMPERATURES ON THE BIOLOGICAL ASPECTS OF Phthorimaea opercuella (Zeller) AND THERMAL UNITS (DEGREE DAYS)". Journal of Plant Protection and Pathology, 34, 3, 2009, 2191-2197. doi: 10.21608/jppp.2009.122328
Abd El-Wahab, H., Ebrahim, S., El- Dabi, R. (2009). 'INFLUENCE OF CONSTANT TEMPERATURES ON THE BIOLOGICAL ASPECTS OF Phthorimaea opercuella (Zeller) AND THERMAL UNITS (DEGREE DAYS)', Journal of Plant Protection and Pathology, 34(3), pp. 2191-2197. doi: 10.21608/jppp.2009.122328
Abd El-Wahab, H., Ebrahim, S., El- Dabi, R. INFLUENCE OF CONSTANT TEMPERATURES ON THE BIOLOGICAL ASPECTS OF Phthorimaea opercuella (Zeller) AND THERMAL UNITS (DEGREE DAYS). Journal of Plant Protection and Pathology, 2009; 34(3): 2191-2197. doi: 10.21608/jppp.2009.122328

INFLUENCE OF CONSTANT TEMPERATURES ON THE BIOLOGICAL ASPECTS OF Phthorimaea opercuella (Zeller) AND THERMAL UNITS (DEGREE DAYS)

Article 6, Volume 34, Issue 3, March 2009, Page 2191-2197  XML PDF (636.83 K)
Document Type: Original Article
DOI: 10.21608/jppp.2009.122328
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Authors
Horia A. Abd El-Wahab1; Soad A. Ebrahim2; Roda M. El- Dabi1
1Plant Protection Research Institute, Dokki, Giza.
2College of Environmental Agric.Sciences at El-Arish Suez Canal Univ.
Abstract
This investigation was carried out in laboratory at Vegetable Research Pests Dep. Plant Protection Research Institute Dokki,Giza.. To evaluate the effect of three temperatures (20, 25 and 30ºC) on the biological aspects of Phthorimaea operculella(Zell.) Threshold of development (t) and accumulated heats (k) for total preimaginal development of P. operculella were calculated to be 4.9 ºC and 741.7 degree-days (DD`s). Development of egg stage required 68.66 dd`s above 8.6 ºC while larval stage demanded 451.2  dd`s  above  5.8 ºC  and this value 138.2 dd`s above 10.03   ºC for adult stage. Accumulation of 782.1 dd`s were sufficient for the completion of onegeneration.The accumulatedthermal heat units (T.U.) or effective degree-days estimated through insect activity time The aim of this part of investigation is to establish the velocity constants (i.e the relationship between temperature and speed of development).
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