I am trying to figure out how many Myzus persicae would infest a potato without top-down control (predator or parasitoid). In some papers, I have read that Myzus persicae is non-gregarious and therefore does not occur in a large number in a host plant. However, from my experience, a tobacco plant could hold quite a number of Myzus persicae and so could a chinese cabbage. Am I wrong to assume that there will be hundreds of aphids when there is no interference? Is Myzus persicae always gregarious or does it depend on the host plant it feeds on?

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