Studies on the reactions of the large kola weevil, Sophrorhinus quadricristatus Faust to moisture and temperature

DARAMOLA, A.M

ABSTRACT: The reactions of the large kola weevil, Sophrorhinus quadricristatus to moisture in a humidity choice chamber and temperature in a linear temperature gradient were studied. Both the male and female insect showed a hygronegative response in all the pairs of humidities offered. The insects perceived and reacter to humidity differences of 20% R.H. at the lower (10-30% R.H) and upper (60-80% R.H.) portions of
the humidity scale. Dehydrated and.starved insects showed a hygropositive response and the intensity of
reaction increased with the period of treatment. S. quadricristatus showed a preferred temperature range
of 27°C – 31.5°C. This range falls within the temperature ranges the insects are usually exposed to in the field and storage.

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