Systemic Granulars To Control Mexican Bean Beetle and Atlantic Spider Mite in Soybeans, 1976

York soybeans were planted May 21' 76 by conventional planters with 36 in row spacing. Treatment plots were replicated 4 times and arranged in a randomized block design. Each plot consisted of a single 30 ft long row with an untreated row adjacent to each treatment plot. All materials were applied with an Almaco V-Belt Nursery Seeder, banded about 1.5-2.0 in from the seed and 2.0 in deep. Mexican bean beetle larvae counts were made on July 7 by selecting 10 plants at random from each plot and counting all the larvae thereon. The effectiveness of the various systemics against the Atlantic spider mite was determined by taking a single leaf from each of 25 plants/plot on July 26 and Aug 7 and recording the number of mites on 1 square inch of leaf surface or by foliage injury ratings. These foliage injury ratings were as follows: 1) No visible signs of mite damage; 2) Some "flecking" of leaves but not enough to interfere with plant growth; 3) Mite injury obvious; possible retardation beginning; 4) Severe mite injury on 50% or more of foliage; plants appear stunted; and 5) 100% of leaves severely damaged. The beans were harvested Nov 4 by cutting the entire 30 ft row and threshing with a stationary plot thresher.