Towards predicting outbreaks ofPseudocoremia suavis(Lepidoptera:Geometridae)

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Abstract
In the light of a recent epidemic of Pseudocoremia suavis in mature, heavily stocked stands of Douglas fir, the need for a simple routine survey for the common defoliator of exotic forest plantations is discussed. Detailed records of 8 consecutive generations of P. suavis were obtained from an energy flow programme. Population fluctuation showed a marked correlation with rainfall in the formative month of a given generation. Consequently, a simple routine survey, based on the host's silvicultural condition and on precipitation, is proposed.