Potato Pest Control, 1997

‘Kennebec’ potatoes were planted 23 May at the Fry Farm, OARDC, Wooster, OH. Plant spacing was 38 inches between rows and 9 to 10 inches between plants. Fertilizer was applied at planting (1750 lb/acre 10-20-20). The Admire 2F (in-furrow) treatment was applied at planting using a CO2 compression sprayer at 20 psi with a 8004 flat-fan nozzle delivering the insecticide into the seed furrow. The field was treated for weed control on 10 Jun with 0.67 lb/acre of Sencor DF plus Dual 8 E at 2 pt/acre. Fungicide, 1.5 lb/acre Pencozeb DF, was applied 2, 10, 17, 24 Jul, and 26 Aug. Bravo Ultra at 1.33 lb/acre was applied 4 Sep. Paraquat, 1 qt/acre, was applied 18 Sep as a vine killer. Plots were two rows wide and 40 ft in length, with 9-ft alleys separating plots and 3-ft alleys separating blocks. Treatments were arranged in a RCB design. Foliar treatments were initiated when the first generation larvae were increasing in the plots. Foliar applications of Provado were made 27 Jun and 12 Aug only. All other foliar treatments were applied 27 Jun, 11 Jul, 12 and 28 Aug. A spreader-sticker was added to all M-Trak applications. Cygon 4 E, 1 pt/acre, was added to the M-Trak treatment 11 Jul to suppress PLH populations. Foliar treatments were applied with a tractor-mounted drop-nozzle boom sprayer delivering 50 gpa at 50 psi with three D-4 hollow-cone nozzles/row. Number of egg masses, small (stadium 1-2), large (stadium 3-4) larvae, and adults were counted and percent defoliation was visually estimated in five 1 -m lengths of row per plot. Leafhopper nymphs and aphids were sampled by visually inspecting 25 compound leaves per plot on each sampling date. Hopperburn was rated 16 Jul by inspecting ten leaves per plot and assigning a damage rating for each leaf as follows; 0 = no symptoms, 1 = curling only, 2 = curling with chlorosis or brown edges. We report the cummulative rating for the ten leaves in each plot. For example, if all ten leaves in a plot had curling and brown edges then the cummulative rating would be 20; if all ten leaves had only curling then the cummulative rating would be 10. Potatoes were harvested 2 Oct and graded 23 Oct, separating tubers into “A” and “B” sizes and culls (rotted or damaged).

Colorado Potato Beetle Control, 1994

‘Gemchip’ potatoes were planted 12 May at the Fry Farm, OARDC, Wooster, OH. Plani spacing was 36 inches between rows and 9 inches between plants. Fertilizer was applied at planting (1750 lb/acre 10-20-20). The field was treated on 7 Jun with 0.75 lb/acre of Sencor DF. Fungicide, Dithane at 2.0 lb/acre, was applied at 12, 19, 26 Jul, 3, 18, 26 Aug, 2 Sep, and Penncozeb at 2.0 Vol acre was applied 10 Aug. Paraquat, 1 pt/acre, was applied 8 and 21 Sep as a vine killer. Plots were two rows wide and 50 ft in length, with 12 ft alleys separating plots and 6 ft alleys separating blocks. Treatments were arranged in a randomized complete block design. Foliar treatments were initiated when the first generation larvae were increasing in the plots and defoliation averaged between 21 and 25.25%. Foliar applications were applied 22 Jun, 1, 12, 19 Jul, and 10 Aug with a tractor mounted drop nozzle boom sprayer delivering 50 gal/acre at 50 psi with three D-4 hollow cone nozzles/row. Number of eggs, small (instar 1-2), large (instar 3-4) larvae, and adults were counted and percent defoliation was visually estimated in five 1-m lengths of row per plot weekly. Leafhopper nymphs and aphids were sampled by visually inspecting 5 compound leaves per plot on and after 6 Jul.

Colorado Potato Beetle Control, 1993

‘Gemchip’ potatoes were planted 26 May at the Fry Farm, OARDC, Wooster, OH. Plant spacing was 36 inches between rows and 9 inches between plants. Three Admire 2F seed piece treatments were applied at planting using a CO2 compression sprayer at 40 psi with an 8004 flat fan nozzle delivering the insecticide into the seed furrow. The field was treated on 16 Jun with 0.75 lb/ acre of Sencor DF. Fungicide, Dithane at 2.0 lb/acre, was applied 9 Aug. Paraquat, 1 pt/acre, was applied 7 Sep as a vine killer. Plots were two rows wide and 40 ft in length, with 10 ft alleys separating plots and 6 ft alleys separating blocks. Treatments were arranged in a randomized complete block design. Foliar treatments were initiated when the first generation larvae were increasing in the plots in early Jul. Foliar applications were made 3 and 12 Jul and 3 and 12 Aug. The Trigard single application treatment was applied only on 3 Jul and 3 Aug. Foliar treatments were applied with a tractor mounted drop nozzle boom sprayer delivering 50 gal/acre at 50 psi with three D-4 hollow cone nozzles/row. Bond spreader sticker was added at 4 oz/ 100 gal solution to all rates of the following insecticides: Prokill Cryolite 96, AC303,630, M-Trak, and Novodor. Number of eggs, small larvae (instar 1-2), large larvae (instar 3-4), and adults were counted, and percent defoliation was visually estimated, in five 1-m lengths of row per plot approximately five days after each application.