"CARBAMATE BAITS DISCOURAGE BLACKBIRDS FROM USING FEEDLOTS" by Paul P. Woronecki, Joseph L. Guarino et al.

Vertebrate Pest Conference Proceedings collection

 

Date of this Version

February 1970

Document Type

Article

Abstract

Red-winged blackbirds (Agelaius phoeniceus) have been discouraged from using cattle feedlots near Denver, Colorado, by baiting alleys with cracked corn treated with an aversion-producing immobi1izing agent, DRC-736 [4-(methylthio)-3,5-xylyl N-methylcarbamate]. In three studies, large populations of redwings were reduced 70% - 98% within a few days and protection lasted about a month. In a fourth study, simultaneous baiting of three heavily used feedlots reduced redwing use by more than 90% within hours and was apparently responsible for these birds abandoning their roost and relocating in areas where they caused little trouble. Mortality was low (less than 5% of affected redwings in the fourth study), and few birds of nontarget species were affected.

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