4-Aminopyridine Effectiveness in Sweet Corn Related to Blackbird Population Density

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Abstract
Applying cracked corn to sweet-corn fields, with 1% of the particles treated with 4-aminopyridine (4-AP), generally did not reduce blackbird (Icteridae) damage in Ohio, Maryland and New York in 1974. These findings contradict results reported from tests of 4-AP treatments in localities where blackbird population densities were considerably higher than in our test localities. The lack of success of this treatment in protecting sweet-corn fields in the eastern US was probably due, at least in part, to low population densities and to low frequencies of reacting birds. The effectiveness of 4-AP-cracked corn treatments can be improved by increasing the proportion of treated corn particles and by changing the application rate.

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