e-ISSN 2231-8542
ISSN 1511-3701

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Laboratory studies of the effects of selected tropical fruits on the larvae of Dacus dorsalis, Hendel

A. Ghani Ibrahim and Mohd. Dzur A. Rahman

Pertanika Journal of Tropical Agricultural Science, Volume 5, Issue 1, July 1982

Keywords: Dacus dorsalis, tropica! fruits, host-suitability, larval density.

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A laboratory study (27° C-30° C) on the suitability o f tropical fruits fo r the larval development shows that it is in the order o f : Papaya > carambola > banana > mango = water-melon > jackfruit > citrus > pineapple. In a suitable host i.e. papaya, the weight o f the pupa was 11.6 g and life-cycle was 20.4 days. In the least suitable host i.e. pineapple, the weight o f pupa was 4.9 g and life-cycle was 1 7.4 days. With papaya as food, the life-cycle o f D. dorsalis depended on the density o f the larvae within the food. A density of 10 larvae in 20 got foods had a life-cycle o f 21. 7 days, whereas a density o f 50 larvae in the same quantity’ o f food had a life-cycle o f 15.1 days. The percentage o f adult emergence decreased with increase in the larval density.

ISSN 1511-3701

e-ISSN 2231-8542

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