Abstract
Abstract A description is provided for Entomophthora planchoniana . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Aphids (Hemiptera: Aphididae) including species of Cinarinae, Chaitophorinae and Drepanosiphanae which are not usually attacked by the other common species of the Entomophthorales . GEOGRAPHICAL DISTRIBUTION: Widespread, including Europe, N. & S. America, Australasia, Asia. DISEASE: Aphids become infected by a germ tube from an adhering conidium penetrating the cuticle. Naturally green aphids killed by this species are straw coloured and those filled with resting spores are grey. Black aphids turn reddish-brown. The rhizoids issuing from infected large aphids viewed from the side suggest stout supports. In N. Europe this species persists in aphid populations in warmer and drier conditions than all the other species attacking aphids except Neozygites fresenii . It frequently infects cereal aphids infesting the ears of cereals whereas Erynia neoaphidis is usually restricted to aphids on the leaves of the plant where conditions are less extreme.
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