Control Of Green Peach Aphid On Potato, 1995

Potatoes were planted 15 May at the University of Minnesota Agricultural Experiment Station, Rosemount, MN. Plots were 1 row, 25 ft long, and separated from other plots by 6 ft of fallow. Treatments were arranged in a RCB design with 4 replications. Treatments for GPA control were applied on 9 Aug, except for Admire 2F which was applied in-furrow at planting prior to closing the seed bed. All spray applications for GPA were made using a CO2 pressurized sprayer fitted with a Teejet 8003-E flat fan nozzle, delivering 60 gal/acre at 35 psi. Late blight control was achieved by 5 spray applications of Bravo 500 (1 pt/acre) on 28 Jun; 7, 13 and 29 July; and 8 Aug, and 3 applications of Ridomil/Bravo 81WP (1 lb/acre) on 20 Jul; 2 and 18 Aug. One application of Novodor (3 qts/acre) was targeted against Colorado potato beetle (CPB) at 30% egg hatch on 17 June. Asana 0.66XL (9.6 fl oz/acre) applications were applied on 22 and 28 June; 12 and 29 Jul to enhance GPA populations for the purpose of this test. Asana treatments also controlled CPB and potato leafhopper. Samples of 10 lower leaves were taken from the center plants in each plot and GPA were counted. GPA counts were made on 10, 17, and 24 Aug; 1, 7 and 14 DAT respectively.