Abstract
English sparrows have been observed methodically searching cabbage plants for insects. Cabbage loopers, Trichoplusia ni, in the advanced stages of nuclear polyhedrosis, lose their natural defense mechanisms and become easy prey for birds. Examination of individual aqueous suspensions of bird feces collected from a cabbage field in St. Louis County, Missouri, in July 1968, revealed high numbers of polyhedra inclusion bodies in 9 of the 12 samples. Per os inoculation of third instar T. ni larvae proved that all 12 suspensions contained virulent polyhedra (i.e., virus) capable of producing the polyhedrosis.
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