| Popis: |
A toxic, fright-producing chemical, 4-aminopyridine, was tested for alleviating damage by redwinged blackbirds (Agelaius phoeniceus) to ripening corn in Brown County, South Dakota. The treatment reduced losses by about 7() percent in 8 contiguous sections colntaining 1,013 acres of corn. Numbers of blackbirds using the treated area fell sharply during a 5-day period after treatment began and remained at a low level for the remainder of the damage season. The technique was highly specific for blackbirds. Although pheasants (Phasianus colchicus) were abundant, there was no evidence that any were affected, and mortality among other species of birds was negligible. Blackbirds, principally red-winged blac3 |
