Pea Aphid (Hemiptera: Aphididae) Population Responses to Selected Pea Cultivars and High Temperatures

The response of Acyrthosipon pisum (Harris) (Hemiptera: Aphididae) population parameters to selected high temperatures (27, 30, 33, 36, 39 degrees C) on 5 cultivars of pea, Pisum sativum L., was determined in laboratory testing. Of the 5 pea cultivars and 5 temperature levels included in our study, the highest values of the population parameters of net reproductive rate, intrinsic rate increase, finite rate increase, generation time, and fecundity of A. pisum was observed at 27 degrees C, regardless of pea cultivar. In decreased as temperature increased at and above 30 degrees C for each cultivar. Furthermore, differences among cultivars were often detected at 27 degrees C and 30 degrees C, but not at higher temperatures. Our results indicated that.