The effect of different temperatures and host plants on the biology of long tailed mealybug (Pseudococcus longispinus)
1996
Gillani, W.A. | Copland, M. (Wye Coll., Kent (United Kingdom). Dept. of Biological Sciences) | Hashmi, A.A.
The effect of four different temperatures i.e. 20, 24, 28, and 32 Centigrade and three different host plants i.e. squashes (cv. Butternut), red potato (cv. Desiree) and white potato (cv. Cara) and their interaction on the biology of long-tailed mealybugs was studied. Temperature has a significant effect on the pre-adult stages of both male and female mealybugs. There is a reduction in the stadia duration as temperature rises until 28 Centigrade. In males the total pre-adult period was 44 days at 20 Centigrade, 35 days at 24 Centigrade, 32 days at 28 Centigrade and 33 days at 32 Centigrade. In females the total pre-adult period was 45 days at 20 Centigrade, 32 days at 24 Centigrade, 30 days at 28 Centigrade, and 36 days at 32 Centigrade. The total life of female was 103 days at 20 Centigrade, 77 days at 24 Centigrade, 83 days at 28 Centigrade, and 53 days at 32 Centigrade. No significant effect of temperature on the number of crawlers produced was found at 20 Centigrade, 24 Centigrade, and 28 Centigrade. However the number of crawlers was significantly reduced at 32 Centigrade. A significant effect of temperature on the sex ratio was observed. The effect of host plants was not significant at advanced stages of development.
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