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Baythroid 2, a pyrethroid insecticide (active ingredient cyfluthrin), has been registered for use against insect pests of alfalfa and sorghum since 1997. The United States Environmental Protection Agency (EPA) recently approved the use of Baythroid 2 against insect pests of corn and soybeans. Table 4 provides an abridged list of insect pests for which Baythroid 2 is labeled, with recommended rates of application. Some critical use information is included in the footnotes. Cyfluthrin, like all pyrethroids, is highly toxic to fish and aquatic invertebrates, so caution should be practiced to avoid drift or runoff into bodies of water. Mammalian toxicity is relatively low--oral LD50s for male and female rats are 1,015 mg/kg and 826 mg/kg, respectively; the dermal LD50 for male and female rats is >2,000 mg/kg. Cyfluthrin is very water insoluble (2 ppb). Performance of Baythroid 2 in insecticide efficacy trials has been equivalent to performance of the other pyrethroids--Ambush, Asana, Capture, Mustang, Pounce, and Warrior--used in a similar fashion. For more information about Baythroid 2, contact your local Bayer Crop Protection representation or Bayer Corporation, P.O. Box 4913, Kansas City, MO 64120; telephone (800) 842-8020.--Kevin Steffey
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