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Using Systemic Insecticides For Aphid Control. Identical experiments to evaluate systemic insecticides on long-term aphid control in potatoes were planted at the Madras site of Central Oregon Agricultural Research Center. Aphids were collected from each plot each week during the growing season and categorized as wingless, winged green peach aphid, or other winged.
Early Blight Control With Quadrus. An experiment to evaluate the efficacy of the new broad spectrum fungicide Quadris (azoxystrobin) on early blight development in 'Shepody' (Solanum Tuberosum L.) potatoes was planted at the Powell Butte site of Central Oregon Agricultural Research Center in 1997. Early blight was first observed in the experiment on August 5 and the percentage of the leaf area infected with early blight nearly doubled each week after mid-August in the untreated control plots.
Seed Potato Winter Test Comparison Study. An experiment to compare winter testing schemes for certifying seed potato lots was undertaken in the fall of 1995. Samples taken from seedlots produced during the 1995 and 1996 growing seasons were obtained from local growers and divided into two size ranges.