The adult western spotted cucumber beetle (WSCB), Diabrotica undecimpunctata
undecimpunctata Mannerheim is considered a major pest of snap beans grown for
processing in Western Oregon. Control consists of 1 or 2 insecticide sprays prior to
harvest. A commercial semiochemical-based insecticide bait, Adios TIC��, 1.3% carbaryl
+ 5% buffalo gourd root powder + 0.7% TIC mixture (1,2,4-trimethoxybenzene, indole,
and trans-cinnamaldehyde, 1:1:1), was evaluated for the control of WSCB in commercial
snap beans. Adios TIC�� did not result in improved WSCB control as reflected by
number of beetles and pod damage.
Twenty one plant volatile compounds were evaluated for their attractivity to
WSCB in snap bean and squash fields by comparing the number of beetles caught on
sticky traps in 1 to 3 day periods. The chemicals beta-ionone, benzyl alcohol, and indole
consistently attracted significantly more beetles than unbaited traps. An equal part of
these chemicals caught more WSCB than those baited with any of the two component mixture blends or even individual components. Captures of WSCB increased
significantly as doses of the 1Bb mixture in trap increased. Baited traps placed inside and
at the edge of alfalfa fields caught similar numbers of WSCB. More WSCB were caught
on traps inside than outside fields. Traps baited with the 1Bb mixture placed at canopy
level or at 10-15 cm above canopy caught equal numbers of WSCB. Traps below plant
canopy caught fewer WSCB. Most WSCB were caught from 10:00 to 13:00 hrs and
from 16:00 to 18:00 hrs. Fresh preparations of IBb were the most attractive to the beetle.
The majority of WSCB attracted by the IBb mixture were males (���80%). Its individual
components, indole and benzyl alcohol attracted mostly females (���73% and 70%
respectively), beta-ionone attracted mostly males (���80%). / Graduation date: 1998
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/34002 |
| Date | 02 December 1997 |
| Creators | Hongtrakul, Tawatchai |
| Contributors | Fisher, Glenn C. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
Page generated in 0.0017 seconds