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A Possible Baculovirus in the Insect-parasitic Fungus, Strongwellsea magna

Department of Entomology University of California Riverside, California, 92521 U.S.A.

R. A. Humber

N.E. Plant, Soil and Water Laboratory U.S.D.A. Agricultural Research Service University of Maine Orono, Maine, 04473 U.S.A.

Particles similar in appearance to the virions of the invertebrate baculoviruses have been found in large numbers in hyphae of the insect-parasitic fungus, Strongwellsea magna, growing in the fly, Fannia canicularis. The particles (100 x 390 nm) consisted of a densely staining core (50 x 340 nm) within a poorly staining envelope. The envelope of some of the particles was contiguous with vesicles derived from unit membranes originating at the hyphal plasma membrane. The structure and aspects of the apparent morphogenesis of these particles suggest they may belong to a virus of the genus Baculovirus.

Received 28 September 1976; accepted 31 December 1976.