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The significance of a facultative bacterium to natural populations of the pea aphid Acyrthosiphon pisum

Abstract. 1.  Laboratory studies have implicated various accessory bacteria of aphids as important determinants of aphid performance, especially on certain plant species and under certain thermal regimes. One of these accessory bacteria is PABS (also known as T‐type), which is distributed widely but is not universal in natural populations of the pea aphid Acyrthosiphon pisum in the U.K.