Abstract
Abstract Evaluation of several insecticide treatments for control of 1st generation ECB larvae, were conducted near Chester, SD. Preapplication counts indicated a uniform infestation of 3rd-instar, or younger larvae in ca. 80% of stalks sampled. Granules were applied to corn at whorl (2 Jul, ca. 1 wk prior to tasseling) stage. Untreated controls were used to assess the performance of 11 granular and 9 liquid insecticide treatments in single row plots (16.4 cm by 30.5 m) using a randomized complete block design with 4 replications. Granules were placed directly into corn plant whorls using a Gandy pneumatic device powered by a 3.5 hp gasoline engine. Noble metering units attached to a modified chain-driven apparatus regulated the amount of granules released into the pneumatic device. The entire system was mounted on a Highboy applicator. Liquids were applied with a 3 gal CO2 backpack sprayer unit and a hand-held spray boom equipped with a single Teejet 8002 nozzle delivering 20 gal/acre at 39 psi. Insecticides were applied to corn at whorl stage. Approximately 1 month following application (2 August), twenty cornstalks were randomly chosen from each plot. Each plant was bisected vertically and examined for ECB stalk tunneling damage. The number and length of ECB cavities were recorded and analyzed using SAS’s GLM procedure with means being compared by DMRT.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call