Evaluation of different diets on biological parameters of ladybird beetle, Coccinella undecimpunctata L. (Coleoptera : Coccinellidae)

Document Type : Original Article

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Plant Prot. Dept., Fac. of Agric. , Zagazig Univ., Zagazig, Egypt

Abstract

In this study, the effect of different diets on the biological characteristics of Coccinella undecimpunctata L. were studied under laboratory conditions of 26 ± 1°C and 65 ± 5% R.H. Three  diets namely; AD1 (as basic artificial diet) , AD2 (as improvement artificial diet), aphid, Aphis craccivora  Koch  frozen as well as live aphid, (A. craccivora) as control were evaluated on the biological aspects of C. undecimpunctata . Results showed that the mean larval duration recorded 10.64 days, when larvae fed on control. It extended to 14.26, 14.56 and 21.27 days for frozen aphid, AD2 and AD1, respectively. Larval survival percentages were 93.33, 83.33, 73.33, and 60.00% when larvae reared on control, AD2, AD1 and frozen aphid, respectively. The maximum pupation percentage (92.86%) recorded in control, while minimum (66.67%) on frozen aphid. Adult emergence percentages on control was 92.31%, with sex ratio of 54.17%. Whereas, it 80.00 % with sex ratio  of 62.50 % when larvae fed on AD2.Ovipositional  period of mated female extended to 56.63 days and reproduced about 992.26 eggs throughout its lifespan, on control, whereas the lowest one (189.50 eggs) was noticed with AD1. Treatment control and AD2 gave the best result for egg fertility (95.62 and 75.90 %), egg hatching (95.01and 79.20 %) , respectively.Highest growth index was recorded with control (4.75) almost similar to artificial diet (AD2) (3.39). In general, AD2 played an important role in whole life cycle of C. undecimpunctata for mass production and proved better on most above parameters. 

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