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Effect of Spray Irrigation with Municipal Sewage Effluent on the Cereal Leaf Beetle and the Frit Fly Infesting Reed Canarygrass¹

ABSTRACT

Twelve clones of reed canarygrass (Phalaris arundinacea L.) that were spray irrigated with municipal sewage effluent had a mean of 0.03 larva per clone of cereal leaf beetle (Oulema melanopus L.) on 7 June 1974; similar unirrigated clones had a mean of 3.2 larvae per clone on that date. Also, the irrigated clones had fewer culms killed by the frit fly (Oscinella frit L.) than unirrigated clones on 7 June and 12 Aug. 1974. Therefore, reed canarygrass as a receptor of sewage effluent, already the most acceptable species because of its flood tolerance, is even more desirable because there should be fewer numbers of these two important pests.

Key Words: host plant resistance

¹ Contribution No. 351 from the U. S. Regional Pasture Research Lab., ARS, USDA, University Park, PA 16802. In cooperation with the Inst. for Research on Land and Water Resources, The Pennsylvania State University.

² Research Entomologist and Research Plant Pathologist, respectively.

Received for publication September 22, 1975.