Control of Resistant Colorado Potato Beetle, Big Lake, Mn, 1994

This is the third trial in this general potato production area, and is the first with so many new chemistries in the same trial. We initiated trials at this location in 1992 because most other compounds began to fail. Soils are sandy loams and are irrigated. Plots were 4 rows X 30 ft. long with a row width of 3 ft. in a RCB design, replicated 4 times. Soil applications of Admire 2F were made post plant (6 May) by opening the planting ridge, and applying Admire 2F at the rate of 1.3 fl. oz/1000 row foot in 20 gal total material. The ridge was then replaced. Foliars were broadcast in 20 gal total material on 14, 21, 29 June; 6, 12, 20 July. The entire plot area was treated with the rest of the field the last week of July. The two center rows of each plot were harvested and weighed for yield.