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Abstract
Stethoruse punctillum Weise is one of the common predators which widely spread and the most active coccinellid predators. It was common biocontrol agents against spider mites where their larval and adult stages feed on the different stages of spider mites.
The present work was carried out under laboratory condition to study some biological aspects of Stethorus punctillum and its efficiency as biological control agent under different conditions.
The result revealed that in the laboratory under different temperatures 15, 25 and 35°C. The duration of the eggs were 203.0±3.93, 94.08±1.08 and 69.87±1.16 hours, respectively at 15, 25 and 35ºC, and duration of total larval stages of S. punctillum were 424.93±4.08, 144.20±6.92 and 122.00±1.80 hours, respectively at 15, 25 and 35°C, duration of the pupa was 189.93±3.87, 72.73±1.10 and 62.42±0.74 hours, respectively at 15, 25 and 35ºC, while the predator completed life cycle within 819.21±5.99, 319.95±3.04 and 254.36± 2.10 hours, respectively at 15, 25 and 35°C.
The longevity of male predator was 81.71±2.53, 62.93±1.62 and 38.38±2.96 days, respectively at 15, 25 and 35ºC. While the correspondent female longevity was 97.78±1.23, 60.10±1.10 and 32.81±2.08 days, respectively.
The total number of eggs laid per female per day was 2.68±0.14, 3.59±0.20 and 4.51±0.27 eggs, respectively, at 15, 25 and 35ºC.
When predator reared on immature stages of prey the results showed that, the 4th larval instar is most larval consumption where consumed 214.95±9.15, 92.33±1.72 and 162.50±12.05 immature prey at 15, 25 and 35ºC, respectively. Adult male of the predator consumed 36.55±0.51, 54.95±0.78 and 106.35±2.39 individuals of immature prey at 15, 25 and 35ºC, respectively, while the female predator relatively consumed more prey individuals than the male, it consumed 38.33±0.56, 54.13±0.89 and 120.95±3.44 individuals at the correspondent temperatures, respectively.