Comparison of life tables of Coccinella septempunctata L. and Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) reared on Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) Biotype B prey
Imtiaz Ali Khan, Fang-Hao Wan
ABemisia tabaci is a major pest of many agricultural crops worldwide. Coccinella septempunctata and Harmonia axyridis are two important polyphagous predators of B. tabaci on different agricultural crops. In the present study, life tables of the two predators were compared with feeding on B. tabaci biotype B prey on tomato host plant leaves as arena of observations under laboratory conditions. The results showed that both C. septempunctata and H. axyridis were able to complete embryonic and immature development and reached to adult stage when fed on B. tabaci prey. Mean total duration from egg to adult stage was 26.5 and 24.8 days for C. septempunctata and 20.6 and 19.9 days for H. axyridis females and males, respectively. Mean adult longevity of C. septempunctata was 74.8 and 61.8 days and of H. axyridis 62.6 and 47.3 days for females and males, respectively. C. septempunctata laid a mean total number of 710.5 eggs/female, while H. axyridis 542.0 eggs/female. Total mortality during different immature stages of C. septempunctata was 35.8% and of H. axyridis it was 37.2%. Female to male sex ratio was 51:49 for C. septempunctata and 52:48 for H. axyridis..
Imtiaz Ali Khan, Fang-Hao Wan. Comparison of life tables of Coccinella septempunctata L. and Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) reared on Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) Biotype B prey. 2015; 3(3): 243-248.