Abstract
Abstract Performance of granular insecticides and granular plus liquid insecticide combinations against SRA were evaluated in small plot trials near Maynard, Minn. Sugar beets were planted on 23 Apr in a field planted the previous year with sugar beets. Each treatment consisted of four 50-ft rows on 22-inch centers, with plants thinned to 8 inches. Treatments were arranged in a randomized complete block design with 4 replications; 1 untreated row bordered treatments on either side. Granular insecticides were applied on 9 and 10 Jul in a 7-inch band on both sides to the base of plants using a Noble applicator. Liquid insecticides were applied 30 Aug in a directed spray at the base of the plants using a CO2 backpack sprayer delivering 27 gal/A. Five plants from each replication (20/treatment) were dug on 6 Aug and 11 Sep and 10 plants from each replication (40/treatment) on 4 Oct at harvest. SRA colonies on the beet surface and surrounding soil within 2 inches of the beet surface were collected and total aphids counted.
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