Bacteria Associated with the Walnut Husk Fly, Rhagoletis completa1

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Abstract
In a study of the microflora associated with the walnut husk fly, Rhagaletis campleta Cresson, I obtained a total of 15 morphologically different isolates. Isolations were made from all life stages, as well as from rotted walnut pulp, under aerobic conditions. Out of the 15 isolates only 2, identified as Pseudomonas sp. and Xanthomonas sp., were associated with all life stages; a 3rd isolate, Serratia sp. was found to be associated with all but the pupal stage. None of the remaining isolates was associated with more than 2 life stages of the fly. The isolated Xanthomonas sp. was very similar to the walnut blight bacterium but unable to cause either necrosis, when infiltrated into young walnut leaves, or the hypersensitive reaction within tobacco leaves. Both sexes of adult R. completa bear an unpaired oesophageal diverticulum just anterior to the brain, housing bacteria.

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