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In an attempt to delay hatching without affecting their viability, the eggs ofLatheticus oryzae W. were subjected to cold treatment at 5 ~ for varying periods and at different stages of their development. A small dose of 0.5 krad of gamma radiation was also given at each of those temperature treatments. Most of the eggs hatched at 30 ~ following low-temperature exposures of 1 and 2 days. There was a significant decrease in hatch as the exposure period increased further (P<0.05). An egg exposure to 5 ~ also led to an increase in egg period and the increase was nearly equal to the period of cold exposure. Radiation did not alter the situation.Receivedforpublication: December 28, 1975