Taha, M., Abd-El Wahab, H., Mahmoud, H., Abd el hamed, G. (2012). EFFECT OF DIFFERENT TEMPERAURES, THERMAL, THRESHLOD UNITS ON DEVELOPMENTOF SILVERY MOTH, Autographa gamma Linn.. Journal of Plant Protection and Pathology, 3(4), 355-361. doi: 10.21608/jppp.2012.83776
M. A. Taha; Horia A. Abd-El Wahab; Hanaa I. Mahmoud; Ghada El S. Abd el hamed. "EFFECT OF DIFFERENT TEMPERAURES, THERMAL, THRESHLOD UNITS ON DEVELOPMENTOF SILVERY MOTH, Autographa gamma Linn.". Journal of Plant Protection and Pathology, 3, 4, 2012, 355-361. doi: 10.21608/jppp.2012.83776
Taha, M., Abd-El Wahab, H., Mahmoud, H., Abd el hamed, G. (2012). 'EFFECT OF DIFFERENT TEMPERAURES, THERMAL, THRESHLOD UNITS ON DEVELOPMENTOF SILVERY MOTH, Autographa gamma Linn.', Journal of Plant Protection and Pathology, 3(4), pp. 355-361. doi: 10.21608/jppp.2012.83776
Taha, M., Abd-El Wahab, H., Mahmoud, H., Abd el hamed, G. EFFECT OF DIFFERENT TEMPERAURES, THERMAL, THRESHLOD UNITS ON DEVELOPMENTOF SILVERY MOTH, Autographa gamma Linn.. Journal of Plant Protection and Pathology, 2012; 3(4): 355-361. doi: 10.21608/jppp.2012.83776
EFFECT OF DIFFERENT TEMPERAURES, THERMAL, THRESHLOD UNITS ON DEVELOPMENTOF SILVERY MOTH, Autographa gamma Linn.
2Plant Protection Research Institute Dokki- Giza, Egypt
Abstract
Developments of the silver Y moth Autographa gamma Linn(Lepidpterra : Noctuidae) was studied at constant temperatures 20, 25 and 300C0 ±1ْْ 0C . Development of immature stages was accelerated as the tested temperatures increased .Total developmental time of larval duration averaged 25.26, 19.14 and 12.08 days at 20, 25 and 300Crespectively. Generation period ranged between 46.34and 23.81days depending on rearing temperature. Adult female survived slightly longer than male. Fecundity was higher at (300C) than 200C. Female of A. gamma deposited 106.67eggs at 30 0C, while this number drastically decreased to 18.55 eggs at 20 0C. However, egg hatchability was %72.41; 66.04 and 63.64 at 20,25and 30 0C respectively.
The threshold of development (t0) degree- day (DDs ) was estimated to be 7.50C, 10.830C and 3.020C for eggs, larvae and pupae, respectively. Based on estimated preferred temperature30,25 and 20 C0 heat units (U.T. ) 79.2, 362.5and 247.8 are required to complied the development of egg, larval and pupal stages. Development of one generation may acquire 726.4 Degree-days.
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