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Interactions of Foliar Insecticides Applied with Pyrithiobac

Published online by Cambridge University Press:  12 June 2017

Ralph L. Allen  and
Charles E. Snipes
Ralph L. Allen
Affiliation:
Mississippi Agric. For. Exp. Stn., Delta Branch, Stoneville, MS 38776
Charles E. Snipes
Affiliation:
Mississippi Agric. For. Exp. Stn., Delta Branch, Stoneville, MS 38776
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Abstract

Field and greenhouse experiments were conducted to determine the effect of selected insecticides on cotton when applied in combination with pyrithiobac. In the field, acephate, azinphos-methyl, bifenthrin, chlorpyrifos, dicrotophos, esfenvalerate, malathion, methomyl, or oxamyl was applied foliarly with the sodium salt of pyrithiobac at 70 g ae/ha. Pyrithiobac plus malathion resulted in greatest injury when compared with other treatments. There were no differences observed in fruiting characteristics of cotton. Cotton yield was lower with oxamyl, methomyl, and chlorpyrifos when applied in combination with pyrithiobac in one of three experiments. In greenhouse experiments, injury due to pyrithiobac was greater in a cool (21 C day, 13 C night) temperature than in a warm temperature (30 C day, 21 C night), but differences were less than 15%. Pyrithiobac plus malathion in the cool environment injured cotton more severely 7 DAT than either pesticide alone. Adding insecticides to pyrithiobac did not influence injury in the warm environment.

Keywords

Acephate, O,S-dimethyl acetylphos-phoramidothioateazinphos-methyl, O,O-dimethyl S-[(4-oxo-1,2,3-benzotriazin-3-(4H)-yl)methyl]-phosphorodithioatebifenthrin, (2-methyl[1,1′-biphenyl]-3-yl)methyl 3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl-cyclopropanecarboxylatechlorpyrifos, O,O-diethyl-O-(3,5,6-trichloro-2-pyridinyl)phosphorothioatedicrotophos, dimethyl phosphate of 3-hydroxy-N,N-dimethyl-cis-crotonamideesfenvalerate, (S)-cyano(3-phenoxyphenyl)methyl-(S)-4-chloro-alpha-(1-methylethyl)benzeneacetatemalathion, O,O-dimethyl phosphorodithioate of diethyl mercaptosuccinatemethomyl, S-methyl N-[(methylcarbamoyl)oxy]thioacetimidateoxamyl, methyl N′,N′-imethyl-N-[(methylcarbamoyl)oxy]-1-thiooxamimidatepyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2- pyrimidinyl)thio)benzoic acidcotton, Gossypium hirsutum L. ‘DES 119.’COTMAPcotton fruitingherbicide combinationssynergismtemperaturemalathionGossypium hirsutum L. ‘DES 119.’
Type
Research
Information
Weed Technology , Volume 9 , Issue 3 , September 1995 , pp. 512 - 517
Copyright
Copyright © 1995 by the Weed Science Society of America 

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