Open AccessEvaluation of Bacillus Thurengiensis and Some Organophosphorus Compounds for Heliothis SPP. Control in Mississippi, 1986
Author(s) -
Jack T. Reed,
Robert R. Grant
Publication year - 1987
Publication title -
insecticide and acaricide tests
Language(s) - English
Resource type - Journals
ISSN - 0276-3656
DOI - 10.1093/iat/12.1.243a
Subject(s) - acre , randomized block design , heliothis , horticulture , aerial application , biology , toxicology , agronomy , pesticide , pest analysis , noctuidae
Eight 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 and arranged in a randomized complete block design with 4 replications, were located at the Plant Science Research Farm, Mississippi State University, Starkville, MS. 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 24 and 31 Jul, and 14-15 Aug. All plots received additional applications of insecticide for control of early season thrips, boll weevil and aphids. Heliothis spp. larvae were counted by whole plant search of 10 plants in each plot.
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