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- Title
Capsicum oleoresin: development of an in-soil repellent for pocket gophers.
- Authors
Sterner, Ray T.; Shumake, Stephen A.; Gaddis, Stanley E.; Bourassa, Jean B.
- Abstract
A pre- and post-monitoring study was conducted of the potential use of capsicum oleoresin as an in-soil repellent for northern pocket gophers (Thomomys talpoides). Pocket gophers were captured in irrigated alfalfa (Medicago sativa L), affixed with radio transmitters, and monitored daily for location. Six plots (4.87 x 4.87 m) each were randomly assigned to capsicum oleoresin and soybean oil treatments; these were set up based upon the centers of initial core areas of gophers. Mean (± SD) volumes of capsicum oleoresin and water and soybean oil and water mixtures (10+90 by volume) dispensed onto plots equaled 178.5 (±4.7) and 175.7 (± 14.0) liters, respectively. Movements (m) of the radio-transmitted gophers from plot centers were computed for four daily readings (i.e., 0801-1000, 1101-1300, 1501-1700 and 1801-2000 h). Spectrophotometric analysis of soil samples from capsicum oleoresin plots validated the presence of capsicum on plots and the absence of capsicum on placebo- and off-plot locations. Analysis of variance for movement distances of gophers yielded a Date main effect IF(11, 103) = 2.08, P ≤0.03J and a Date x Reading (time) interaction IF(32, 299) = 3.21, P ≤ 0.01]. Results showed that gophers were located farther from plot centers for the 0801-1000 and 1501-1700 h telemetry readings for 53 days post- chemical application-a probable `disturbance' effect rather than a chemical-induced avoidance. In a prior laboratory study, capsicum oleoresin and soil treatments of 1.5% w/w capsicum caused nearly a 50% decrease in soil contact time by gophers relative to placebo-exposed control animals. This implies that procedural variables warrant revision before abandoning this approach. The potential for soil insertion of repellents as a technique for expelling pocket gophers from territories and some methodological changes for future research of the technique are discussed.
- Subjects
OLEORESINS; PEPPERS; SOIL repellents; POCKET gophers; RODENTS; FORAGE plants
- Publication
Pest Management Science, 2005, Vol 61, Issue 12, p1202
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.1118