Wildlife Damage Management, Internet Center for


Date of this Version

September 1968


I would like to review a few of the characteristics of 3-chloro-p-toluidine hydrochloride (DRC-1339) prior to discussion on the daily and seasonal suscep-tibility of starlings to this avicide. DRC-1339 was screened and developed by the Denver Research Center (U.S.D.I.) and since has been tested in various portions of the country by the Denver Center and other organizations, including the State of California. In California we are much impressed with this compound for a variety of reasons, particularly the specificity of it to birds, ease in handling, ease in formulation, and many other characteristics which make this a highly desirable avicide.

This afternoon I'm going to suggest that the European starling is more sus-ceptible to the compound DRC-1339 at one time of the day than at another, and further that this phenomenon also has seasonal implications that the susceptibility of the starling to this compound varies seasonally. I'm going to talk only about this one compound, DRC-1339, and one species, the European starling. I do not know whether or not the phenomenon applies to other birds and other compounds. We hope to find out, but to date we have worked only on DRC-1339 and the starling. Time does not permit a complete description of the experimental design and the data which we obtained. One point that I will emphasize is that we in terms of the sex, age, and weight of the animal; each sample we tested was as homogeneous biologically as we could get.