Studies on Drought Tolerance in the Water Hyacinth Weevils Neochetina eichhorniae and N. bruchi (Coleoptera: Curculionidae)


Laboratory studies on drought tolerance in water hyacinth weevils Neochetina eichhorniae Warner and N. bruchi Hustache showed that the adults could survive for up to 48 and 28 days respectively under high humidity (95%) in the absence of food and water. When water alone was provided, they were able to survive for 56 and 82 days respectively. Preliminary studies showed that muscle development did not take place in starved adults, precluding ability for migration from dried up tank beds. The weevils can therefore be recommended for releases even in tanks that dry up during summer. Reintroduction may not be required as they probably survive during periods of drought by remaining below plant debris or within crevices in the soil and water may be available to them in the form of dew.


Neoclietina eichliorniae, N. bruchi, Biological Control, Drought Tolerance.

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