A New Plant Insecticide for control of the European Corn Borer12

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Abstract
Ryanex, a new insecticide prepd. from Ryania speciosa, was field tested against the European corn borer in New Jersey and New York in 1943 and 1944. A 50% Ryanex dust was more effective than rotenone or nicotine dusts except in one New York test where the control was comparable. Sprays gave control equal to or better than that produced by cube. Ryanex was essentially equal in effectiveness to DDT. Pending further tests the opt. dust conc. of Ryanex is considered to be between 30% and 50% although indications of effectiveness at lower levels are present. Low borer populations and high percentages of salable ears resulted when the normal number of treatments was reduced and the interval between treatments lengthened. 50% Ryanex dust became less effective at dosages between 20 and 25 lbs. per acre per application although 20 lbs. per acre gave good ear protection in New Jersey. In New York 20 lbs. was less effective than 35 or 50 lbs. per acre. No differences were observed in 40% dusts diluted with Loomis talc, pyrophyllite, tobacco powder or a talc-sulfur mixture. 50% Ryanex gave excellent practical con- trol when applied to commercial plantings with power dusters or with smaller dusters.

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