Studies of Fluctuations in Insect Populations

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Abstract
Emer-gence of Contarinia tritici adults can occur in the autumn of the same year as the larvae attack the wheat, during the next spring and after a lapse of 2 winters. Its parasites generally emerge after the 1st winter but have been known not to emerge until after the 2d. Emergence of Sitodiplosis mosellana takes place up to'' 4 yrs. after the larvae have attacked the wheat, but not later in the same yr. Its para-sites can survive 2 winters in the soil. This variability in the duration of the larval stage is useful in preserving the race and is a cause of sudden increases in numbers.

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