Abstract
Abstract Certified, Class B ‘Katahdin’ seed potatoes were planted on 29 Apr at Landisville, Lancaster County, PA. Plant spacing was 9 inch with 34 inch between rows. Plot size was 4 rows x 25 ft with 2 border rows and arranged in a randomized complete block design with 4 replicates. Temik 15G (1.0 lb (AI)/acre) was applied in-furrow to all treatments including the control. Starting in Jun, Dithane M-45 was applied (1.5 lb (AI)/acre) on a 5- to 7-day schedule for potato late blight control. The foliar insecticides were applied 17 Jun, 10 and 29 Jul, and 12 Aug with a tractor-mounted boom sprayer set to deliver 30 gal per acre at 22 psi. Ten stems per plot were sampled weekly as well as before and after spraying for all stages of Colorado potato beetle (CPB). A subjective damage index was implemented: 1) indicating 0-5% leaf loss, to 5) indicating > 75% leaf loss. Two rows per plot were harvested on 16 Sep and graded by size. Average maximum and minimum daily temperatures (°F) were 79.3 and 51.4 for May, 85.3 and 56.8 for Jun, 87.0 and 62.3 for Jul, and 85.8 and 49.8 for Aug, respectively. Rainfall totalled 1.45 inches for May, 3.85 inches for Jun, 9.23 inches for Jul, and 3.76 inches for Aug.
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