Abstract
Abstract Thirteen treatments were tested for relative efficacy against Heliothis spp. larvae in nonirrigated cotton planted 19 May and thinned to ca. 20,500 plants/acre. Plots 8 rows (38 inch centers) by 50 ft long, separated by 15 ft plowed alleys were located at the Plant Science Research Farm, Mississippi State University, Starkville, MS. Treatments were arranged in a randomized complete block design with 5 replications. Insecticides were applied to 8 rows by a high clearance spray tractor equipped with a compressed air spray system and 3 TX-3 nozzles/row with 15 inch drops between rows. Total spray volume was 5 gal/acre at 4 mph and 38 psi. Plots within a replication were sprayed consecutively with the boom being rinsed twice and blown clear between plots. Treatment dates were 23 Jul, 30 Jul, and 14-15 Aug. All plots received additional applications of insecticide for control of early season thrips, boll weevils and aphids as needed throughout the season. Aphids were evaluated by counting the number of aphids on 3 leaves of 2 plants in each plot on 1 Aug. Heliothis spp. larvae were counted by whole plant search of 10 plants in the 2 center rows of each plot. Yield was obtained by picking the 2 center rows of each plot by mechanical picker on 24 Oct
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
