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Abstract
Twenty‐five chemicals active as, or related to, 2‐acetylpyridine thiosemicarbazones were investigated for their repellency and toxicity to red‐winged blackbirds (Agelaius phoeniceus) and toxicity to starlings (Sturnus vulgaris). Two chemicals (1‐azetidinecarbothioic acid (1‐(2‐pyridinyl)ethylidene)hydrazide and 1‐pyrrolidinecarbothioic acid (1‐(2‐pyridinyl)ethylidene)hydrazide) were about twice as repellent to redwings and from 1/2 to 1/3 as toxic as methiocarb, the most effective bird repellent currently registered in the United States. The repellency of a third chemical, methyl (1‐(2‐pyridinyl)ethylidene)hydrazinecarbodithioate, was similar to that of methiocarb but it was almost 100 times less toxic to redwings than methiocarb and was 20 to 50 times less toxic than related thiosemicarbazones. Twenty‐two other chemicals were not effective repellents or toxicants for redwings or toxicants for starlings.