Abstract
Abstract Certified Class B ‘Katahdin’ seed potatoes were planted 29 Apr in a Hagerstown silt loam soil at Landisville, Lancaster County, PA. Plant spacing was 9 inches with 34 inches between rows. Plots were 6 rows x 20 ft and were arranged in a randomized complete block design with 4 replicates. Treatments consisted of in-furrow applications of Temik 15G, Furadan 15G, Thimet 20G, or Oxamyl 15G, each applied at 3.0 lb (AI)/acre. Additional treatments consisted of: Temik at 1.0 lb (AI)/acre applied in-furrow (IF) plus 1.0 lb (AI)/acre applied as a side-dress at plant emergence (EM); and Temik at 2.0 lb (AI)/acre applied as a side-dress only (EM). Colorado potato beetle (CPB) was sampled weekly on 10 randomly selected plants in each plot. Damage index was assigned on a scale of: (1) 0-5% leaf loss to (5) > 75% leaf loss. On 29 Jul the entire field was sprayed with Pydrin 2.4EC (0.2 lb (AI)/acre) to reduce CPB pressure. Two rows per plot were harvested on 16 Sep and graded by size.
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