Chemical Control of Cotton Bollworm and Tobacco Budworm in Alabama, 1982

• Published in: Insecticide and acaricide tests 1983-01, Vol.8 (1), p.191-191
• Main Authors: Graham, L.C., Gaylor, M.J., Edelson, J.V., Walker, L.
• Format: Article
• Language: English
• ISSN: 0276-3656
• DOI: 10.1093/iat/8.1.191a

A field evaluation of insecticides for Heliothis spp. control was conducted on sandy loam soil at the Plant Breeding Unit of Auburn University, Tallassee, AL. Cotton was planted on 6 May in 40-in rows. Four replicates of 11 treatments were applied in a randomized complete block design. Plots were 10 rows x 75 ft with 25-ft alleys between blocks. Insecticides were applied with ground equipment at a rate of 9 gal total spray/acre (2.5 mph, 60 psi, 2 TeeJet TX4 80 nozzles per row). Due to wet weather which limited access with ground equipment, all plots were sprayed aerially on 20 Jun with a Pounce, Guthion, and Lorsban tank mix to suppress weevils and worms. Plots were treated with test chemicals for Heliothis spp. on Aug 6, 17, 20, 26 and Sep 2 and 14. Pay-Off was applied at a low rate (0.025 lb ai/acre) or a high rate depending on Heliothis spp. abundance. The high rate was applied to plots on Aug 20 and 26. All other applications were made at the low rate" Due to an extended period of inclement weather which began immediately after insecticides were applied on 17 Aug, no data were collected between 10 and 23 Aug. Insecticides were reapplied as soon as weather conditions permitted reentry into the plots (20 Aug). Plots were oversprayed on Aug 13, 20, 24, 31 and Sep 3 and 15 with Guthion to suppress boll weevils. Damage was estimated by examining 25 randomly selected plant terminals from the middle 2 rows of each plot. Heliothis spp. populations were moderate during the testing period.