Abstract
Newly hatched larvae of Latheticus oryzae Waterhouse, on wholemeal wheat flour supplemented with 10% yeast, were maintained at 30°C and either 75 or 85% r.h. under constant illumination of 9·7 ft-candles. At 75% r.h., only 9 out of 37 larvae completed their development, and these had a mean developmental period of 37·7 days. At 85% r.h. all the larvae died before pupation. Larvae maintained under similar conditions but in the absence of light suffered a mortality of less than 3% and had a mean developmental period of 30·3 days at both 75 and 85% r.h.
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