Developemental threshold and thermal requirements for eggs of banana weevil, Cosmopolites sordidus Germar, were determined under laboratory conditions at constant temperatures of 15,18,25,27,30,32 and 34 °C and a photoperiod of 12:12 L/D. The duration of the egg stage decreased from 34.9 days at 15° C to 4.9 days at 30° C, then increased again to 5.3 days at 32° C. Eggs did not hatch above the latter temperature although signs of embryonic development, such as formation of the head capsule, could be observed. Simple linear regression revealed a developmental threshold of 12° C and a thermal requirement of 89 days-degrees average. Highest rates of eclosion occurred between 25° C and 30° C.

https://doi.org/10.4314/acsj.v1i2.69898

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https://doi.org/10.4314/acsj.v1i2.69898

Pests Of Plants; Plant Diseases; Plant Breeding; Disease Control; Banana; Food Security

Bananas; Weevils; Embryonic Development; Biological Control; Nematodes

Acp; Africa; North America; East Africa

Canada; Uganda