Use of Heating Degree Day and Physiological Day Equations for Predicting Development of the Parasitoid Trissolcus basalis12

Abstract
The suitability of physiological day (PD) and heating degree day (HDD) models for predicting development of Trissolcus basalis (Wollaston), an egg parasitoid of the southern green stink bug, Nezara viridula (L.) (Hemiptera: Pentatomidae), was determined under laboratory and field conditions. Predictions of peak numbers of parasitoid emergency by both HDD and PD models were similar and closely correlated with observed peak development for constant temperatures between 21 and 32°C. The use of HDD equation more closely predicted the development of T. basalis in the field. Percent emergence of parasitoids was significantly increased by precipitation.

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