TEMPERATURE AND PREYS AS FACTORS AFFECTING THE BIOLOGY OF COCCINELLA SEPTEMPUNCTATA GROWTH AND ITS PREDATION CAPACITY UNDER LABORATORY CONDITIONS | ||
| Egyptian Journal of Agricultural Research | ||
| Article 7, Volume 98, Issue 1, March 2020, Pages 80-94 PDF (353.15 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2020.114364 | ||
| Authors | ||
| EMAM K. AZZA* 1; Saad A. GAFFAR2; Hamdy M. E. HANAFY1; NADA Z. S. SALAMA2 | ||
| 1Faculty of Agriculture, Ain- Shams University, Cairo, Egypt. | ||
| 2Central Laboratory of Organic Agriculture, ARC, 12619, Giza, Egypt. | ||
| Abstract | ||
| The effect of three constant temperatures (20, 25 and 30 °C) and two host preys (A. gossypii and M. persicae) on Coccinella septempunctataegg incubation periods, instars larvae and adults was studied. Obtained results indicated that using M. persicae as a prey at 25 °C was The effect of three constant temperatures (20, 25 and 30 °C) and two host preys (A. gossypii and M. persicae) on Coccinella septempunctataegg incubation periods, instars larvae and adults was studied. Obtained results indicated that using M. persicae as a prey at 25 °C was the most favorable conditions for rearing C. septempunctata adults. The less generation time (Gt) and the net reproduction rate (Ro) didn’t vary when C. septempunctata was reared on the two prey species. Temperatures of 20 and 25°C produced high values of Ro, while at 30 °C it had the highest Rm and (λ), the shortest doubling time (Dt) and Gt when larvae of the predator fed on one of the two prey species.The study proved that the temperature zone 20- 25°C seemed to be the most favorable conditions for C. septempunctata reproduction depending on the net reproductive rate values (Ro). Predation capacity of this predator was higher in adults than larvae. Female consumed much number of aphids than male. | ||
| Keywords | ||
| Coccinella septempunctata; laboratory studies; temperatures; preys; development | ||
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