Snap Bean Insecticide Trial 2000

Eric Burkness, Suzanne Wold, and W. D. Hutchison, Dept. of Entomology, University of Minnesota, St. Paul, Minn.

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Protocol: The snap bean processing variety ‘Hystyle’ was planted on June 5, 2000 at the University of Minnesota Agricultural Experiment Station at Rosemount, MN. Plots were 4 rows wide with an untreated skip row between plots and 25 ft (7.6 m) long. Rows were planted on 30 in (0.8 m) centers with 10 ft (3.04 m) alleys separating replicates. Treatments were arranged in a randomized complete block design with 4 replicates.

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ECB larvae on wax bean
(Photo courtesy of Tom Rabaey, Pillsbury - Green Giant)

Applications were made with a CO2 pressurized backpack sprayer using a 10 ft boom with 6 nozzles each fitted with an XR-Teejet 8002 flat fan nozzle with no screen. The sprayer was calibrated to deliver 20 gpa (187.04 l/ha) at 35 psi (242 kPa). On July 17 and 24, at blossom and pin-bean (beans < 1 inch) growth stages respectively, 12 consecutive plants from one of the 2 middle rows of each plot were infested with approximately 50 neonate European corn borer (ECB) larvae per plant (July 17) and 20 neonate ECB larvae per plant (July 24) using a bazooka applicator. A total of 3 sprays were applied on July 13, 20, and 27. All treatments were harvested and evaluated August 7 by selecting 5 consecutive plants from center of the 12 infested plants. For each plant, data were recorded for total ECB larvae (in the pods or stem), damaged pods, total pods, and yield. The percentage of stems with feeding damage for each set of 5 plants was also recorded.

Results: All treatments provided a significant reduction in total ECB and ECB in the pods compared with the untreated check (Table 1). The number of damaged pods and percentage of stem damage was also significantly less compared with the untreated check for all treatments except for damaged pods for both rates of RH-2485. No significant differences were found for total pods or yield for any treatment compared with the untreated check (Table 1). No phytotoxicity was observed among treatments.

For more information on snap beans see the "Snap Bean Variety Trial" article from the February 23 issue of the MN Vegetable IPM Newsletter.

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Co-Editors: Bill Hutchison, Department of Entomology, University of Minnesota, hutch002@tc.umn.edu
Jeanne Ciborowski, IPM Program, Minnesota Department of Agriculture, jeanne.ciborowski@state.mn.us
Cindy Tong, Department of Horticulture, University of Minnesota, c-tong@tc.umn.edu
Production Editor: Suzanne Wold, Department of Entomology, University of Minnesota, woldx018@tc.umn.edu

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Last Revised March 29, 2001.
The University, including the Minnesota Extension Service, is an equal opportunity educator and employer.©2001 Minnesota Extension Service, University of Minnesota. All rights reserved. Contact copyright@extension.umn.edu for information on reproduction or use of this material.