Abstract
Abstract ‘Superior’ potatoes were planted on May 15 in Sunderland, MA. The soil type was a fine sandy loam with a pH of ca 5.5. Dinoseb was applied at 2 lb ai/acre prior to plant emergence. Treatment blocks were replicated 4 times in a randomized complete block design. Each block consisted of two 30-ft rows, with a 3-ft fallow area between each plot. Treatments were applied with a 3-gal stainless steel backpack sprayer and a CO2pressurized sprayer at ca 50 psi with a delivery rate of 65 gal/acre. Spray applications were made on Jul 6, 15, and 27, and Aug 3. Since, with few exceptions, all treatments were shown to be significantly different from the control, or, in the latter counts, the control plots were 100% defoliated, the Duncan’s test was applied to the insecticide treatments alone (without the control) to give a better indication of the relative effectiveness of the various insecticides.
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