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Insecticides Do Not Affect Cotton (Gossypium hirsutum) Response to Imazaquin and Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Alan C. York  and
John W. Wilcut
Alan C. York
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695-7620
John W. Wilcut
Affiliation:
Dep. Agron., Univ. Georgia, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
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Abstract

Field and greenhouse experiments evaluated interactions of soil-applied insecticides and imazaquin and imazethapyr on growth and development of cotton. Imazaquin and imazethapyr were applied PPI at 0 to 6 and 0 to 16 g ae ha−1, respectively, in the greenhouse (plus a no-insecticide control), and 0 to 72 g ha−1 in the field in combination with aldicarb, disulfoton, and phorate (without a no-insecticide control) applied in the seed furrow. Cotton shoot fresh weight in the greenhouse experiment decreased linearly as herbicide rates increased. Greater reductions in shoot fresh weight were noted with imazaquin than with imazethapyr. Compared with no insecticide, the methylcarbamate insecticide aldicarb and the organophosphate insecticides disulfoton and phorate did not affect cotton response to either herbicide. In the field, cotton injury increased while stand, yield, and maturity decreased as herbicide rates increased. Delayed maturity was due to a lower percentage of bolls produced on sympodia from main stem nodes four to nine. Imazaquin caused greater injury, greater reductions in stand, greater delays in maturity, and lower yields than did imazethapyr. Earlier maturity was noted with aldicarb-treated cotton. Compared with aldicarb, disulfoton and phorate did not alter cotton response to imazaquin or imazethapyr.

Keywords

Aldicarb, 2-methyl-2-(methylthio)propionaldehyde O-(methylcarbamoyl)oximedisulfoton, O,O-diethyl S-[2-(ethylthio)ethyl] phosphorodithioateimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidphorate, O,O-diethyl S-[2-(ethylthio)-methyl phosphorodithioatecotton, Gossypium hirsutum (L.) ‘Deltapine 90’, ‘Stoneville Coker 304’, ‘Stoneville KC 380’, and ‘Stoneville McNair 235’Pesticide interactionsmaturityplant mappingfiber qualityaldicarbdisulfotonphorate
Type
Soil, Air, and Water
Information
Weed Science , Volume 41 , Issue 2 , June 1993 , pp. 269 - 280
Copyright
Copyright © 1993 by the Weed Science Society of America 

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