Effect of Constant Temperature on The Development and Survival of Immature Stages of the Predator Hippodamia variegata (Goeze) (Coleoptera:Coccinellidae)


Abstract in English

The effect of temperature on the development of the predator Hippodamia variegata (Coleoptera:Coccinellidae) reared on the green peach aphid Myzus persicae Sulzer (Homoptera:Aphididae) was determined at five constant temperatures (15, 20, 25, 30 and 35)°C under laboratory conditions. The present study was conducted at Latakia Agricultural Research Center during 2015 and 2016. This study aimed to determine the impact of temperature on the development of the predator H. variegata to identify the suitable temperature for rearing this predator. The duration (days) and survival (%) were measured for this predator. Results showed that temperature had a significant effect on the development of H. variegata immature stages, whereas the development time from larvae to adult decreased with increasing temperature at thermal range (15-35)°C. The longest larval developmental duration was 24.84 days at 15°C, and the shortest duration was 4 days at 35°C. Also, the shortest pupal duration was one day at 35°C and the longest period was 9.84 days at 15°C. The lowest developmental time from eggs hatching to emergence of adults was 6 days at 35°C, while the longest developmental time was 36.84 days at 15°C. Also the ratio of larval survival was affected by temperature, this ratio was (26%, 52%, 77%, 34%, 4%) at (15, 20, 25, 30 and 35)°C respectively. The results of statistical analysis showed that there were significant differences between the five constant temperatures in all studied biological characteristics, and the temperature 25°C was suitable for a successful rearing of the predator H. variegata.

References used

Ali, A.; and P. Qamar Rizvi (2008). Effect of varying temperature on the development and predation of Coccinella transversalis F. (Coleoptera: Coccinellidae) on Lipaphis erysimi (Kaltenbach). Trend in Biosciences. 1 (1; 2): 18-21
Cameron, J.P.; and D.J. Fletcher (2004). Green peach aphid resistance management strategy. Pesticide resistance: Prevention and Management Strategies. 2005. Pp 109-114
Capinera, J.L. (2005). Myzus persicae (Sulzer) (Insecta: Hemiptera: Aphididae) Distribution - Life Cycle and Description - Host Plants - Damage - Natural Enemies. Publication Number: EENY- 222.University of Florida. Pp 9

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