Foliar Sprays to Control the Colorado Potato Beetle on Tomatoes, 1981

‘UC-134’ tomatoes were direct seeded in single row plots 25 ft in length, on May 27. Each plot was buffered on either side by an untreated guard row. Distance between rows was 6 ft. When plants were 2-3 inches tall they were thinned so as to provide clumps of 3 tomato plants spaced 12 inches apart. The plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk “A” loamy sand. All spray treatments were mixed in 10 gal of water and applied with a custom built row crop sprayer. Each row was covered by 6 drop nozzles delivering 50 gal/A at 90 psi. Treatments were applied Jun 23, Jul 2, Jul 7, and Aug 4. In evaluating the treatments, direct counts of the number of Colorado potato beetle larvae/10 ft of row and the % defoliation were recorded. Yields were taken on Sep 9.