Aphid feeding can cause severe damage to plants including yellow spots on leaves and blighting.
Early stage symptom of aphid feeding include small spots with silver color on the upper side of the leaves.
Aphid adults and cast skin can be seen on the underside of leaves and in severe infestation can also been on stem.
Severe infestation of aphids can cause yellowing and blighting of leaves. Infestation tends to be on the edge of the plots.