Control of Darksided Cutworm, 1987

Abstract

Abstract Experiments, including soil surface (preplanting) and tobacco seedling (postplanting) treatments, were conducted in the laboratory and fields at the Research Station, Agriculture Canada, Delhi, Ont. Plots were replicated 4 times in a randomized complete block design in each experiment. The individual plot was 76 x 14 ft, and consisted of 4 rows of tobacco transplanted on 28 May with 38 plants in each row, the outside 2 rows in each plot being guard rows. Furthermore, 2 subplots (12 by 12 inches each), containing 3 tobacco seedlings in the postplanting experiments, were established in each plot. Test insects were fifth and sixth instars. Ripcord was included in the tests as a standard insecticide. The insecticides were broadcast evenly on the soil surface on 13 May for the preplanting treatments. Treatments to tobacco seedlings on 2 Jun for the posttransplanting treatments were made with a power sprayer equipped with 80-04 Teejet nozzles applying 25 gal/acre at 25 psi and 2.5 mph. In plots receiving soil surface applications, 10 larvae were placed on the soil surface in separate subplots at 0, 3, 6, and 9 DAT. The larvae were retained in the subplots by aluminum barrier strips 8 inches high with 3 inches embedded in the ground.