The soybean aphid, Aphis glycines Matsumara, has recently invaded North American soybeans from Asia. A crucial piece of information needed to understand the population dynamics of the aphid in the United States is the relationship between plant age and the intrinsic growth rate of the aphid. This relationship has been studied in Indonesia where it was found that the aphid’s intrinsic growth rate decreased as plant age increased. We used a combination of planting date experiments, and studies of individual aphids in clip cages to ascertain the relationship between plant age and aphid growth rate in Indiana. We found that, contrary to the Indonesian data, there was a positive relationship between plant age and aphid intrinsic rate of increase.
Species 1: Homoptera Aphididae Aphis glycines (soybean aphid)
Keywords: population dynamics
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