Defense against Feeding by Spring Aphid Parasitism in the Upper Leaf Parts of Host Plants

Figure 2

Proportions of newly fed upon leaves at the upper position of the shoots. When the aphids were present, no upper leaves showed additional feeding, but when the aphids (and attending ants) were removed, the leaves at the same position (upper 1/3) received new feedings. The difference in the proportions was significant (Figure 2).