Abstract
Observations made in 1958 showed that adults of the alfalfa weevil, Hypera postica (Gyll.), were more active during the night than during the day. In 1959, replicated sweep samples were taken at regular intervals over 24-hour periods and periods in early morning, to study the effect of light, temperature, and relative humidity on the diel behaviour of the adult weevils. The results strongly suggested that the diel behavior of the adults was related to light intensity, whereas larvae showed no response to either light, temperature, or relative humidity over the 24-hour period.
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