Parasitized pea aphid on an alfalfa leaf. The body is abnormally large and discolored because of the wasp parasitoid developing inside. The integument of the aphid "mummy" is paper thin and movement of the wasp can be seen inside. When the wasp has completed development, it will chew a hole in the abdomen of the aphid and crawl out. Wasps of this type are important biological control agents. Note, in the upper left part of the image, the mottled leaf surfaces, caused by twospotted spider mites feeding on the leaf. The round, light-yellow objects are mite eggs, which will hatch in a day or two.
HemipteraSternorrhynchaAphididaeAcyrthosiphon pisumpea aphidparasitizedmummyAcarimiteeggsalfalfaSmugMug collection