n African Entomology - Development of the oleander mealybug, (Brain) (Hemiptera: Pseudococcidae), on citrus at five temperatures : research article

Volume 19, Issue 3
  • ISSN : 1021-3589



The effect of constant temperatures on the development, survival and fecundity of the oleander mealybug, , on citrus was determined. Developmental time, rate of development, fecundity and survival were investigated at five constant temperatures and a 16L:8D light:dark regime. The rate of development increased linearly with an increase in temperature for the egg, first nymphal and pupal stages as well as the entire development cycle from egg to adult, but was nonlinear for the second and third nymphal stages. Survival decreased with increase in temperature. required 666.7 degree-days above a lower threshold of 8.7 °C to complete one generation. The highest mean number of 68 eggs per female was recorded at 22 °C. A sex ratio of 1:0.92 (male:female) was obtained from the life table. The net reproductive rate (R) was >1 at all five temperatures, an indication that it is capable of increasing its population numbers despite the high mortality experienced in the first and second nymphal stages.

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