Effect of cold storage on some biological and physiological performance of Adalia decempunctata L.

Abstract

Adalia decempunctata (L.) is a common predator in agro ecosystems. Here, the effects of low-temperature storage on biological parameters, energy reserves, and antioxidant enzymes were investigated. Eggs, larvae, and pupae of this predator were maintained for 1-4weeks and adults for different days (20, 35, 50, and 65 d) at 4, 7, and 10°C in darkness and 70±5% R.H. After storage of 20days, the survival rate in male and female insects was >90% in 4, 7, and 10±1°C. In 65days, the highest survival rate for adult insects was recorded at 4°C. Effect of cold storage on the performance of adult's A. decempunctata was not statistically different for periods up to 35days, but decreased longer duration (65days). The female adults were able to tolerate the cold storage period by producing higher amounts of glucose and antioxidant enzymes, thus displaying a high survival rate. Based on our results, maintaining A. decempunctata adults at low temperatures (i.e. 4, 7, and 10°C) for 20 or 35days performed best without loss of quality.