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An intensive survey and study were made each year from 1952 through 1962 to determine seasonal abundance of living and dead diseased aphids by species on potatoes and to collect many of the infected specimens for exact diagnosis. Results of the study disclosed that the action of entomogenous fungi was outstanding in reducing the size of aphid populations on potatoes. This technical bulletin reports on the results of the continuance of the study from 1963 through 1969. However, the collection of dead, diseased aphids throughout the summer was done only from 1963 through 1966 ; thereafter, diagnosis was limited to dead, diseased specimens intensively collected from potatoes during a 1-week period when fungal activity was greatest. This was usually in mid-August, near the seasonal peak of aphid abundance on potatoes not treated with insecticides.
Life Sciences and Agriculture Experiment Station
Shands, W.A., G.W. Simpson, I.M. Hall, and C.C. Gordon. 1972. Further evaluation of entomogenous fungi as a biological agent of aphid control in northeastern Maine. Life Sciences and Agriculture Experiment Station Technical Bulletin 58.