The parents were transferred to new bean plants to avoid overcrowding and early death of plants and aphids.
Unlike spotted alfalfa aphid, vein chlorosis was not observed after spotted clover aphid feeding in this experiment.
Daily fecundity (number of nymphs produced per adult per day) varied with time for both aphid species and in each experiment (fig. 2).
Twenty-four hours later, the plants were checked to see if the founding aphid had settled and any nymphs produced were counted.
It was demonstrated that this spider did not simply consume greater quantities of aphids because it was bigger.
Each year winged aphids migrate into the area in early summer, and populations expand on adult cereal plants.
However, aphids from tobacco were not sampled from other host-plants in regions where tobacco is not common.
What is responsible for the apparent specificity of aphid resistance genes?
