Abstract
Through a period of three years, 1928, 1929 and 1930, the thermal constant has been used for practical determination of the time when cover spraying should start for the first and for the second broods of codling moth and has seemed to be eminently successful for that purpose. It seems likely that the thermal constant can be used as a satisfactory practical determinator of the length of periods during which spray coatings must be maintained on fruit and foliage against entry by larvae of the first and of the second broods. When the average weekly minimum temperatures reach about 60º F pupation of summer larvae seems to cease and it is thought that these minimum temperatures are probably the agency limiting the number of codling moth broods.
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