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Environmental Effects on MSMA Phytotoxicity to Wild-Type and Arsenical Herbicide-Resistant Common Cocklebur (Xanthium strumarium)

Published online by Cambridge University Press:  12 June 2017

Chandrashekhar I. Nimbal ,
David R. Shaw ,
Gene D. Wills  and
Stephen O. Duke
Chandrashekhar I. Nimbal
Affiliation:
Dep. Plant Soil Sci., Mississippi State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant Soil Sci., Mississippi State Univ., Mississippi State, MS 39762
Gene D. Wills
Affiliation:
Delta Res. Ext. Cent., Mississippi Agric. and For. Exp. Stn., Stoneville, MS 38776
Stephen O. Duke
Affiliation:
USDA, ARS, Southern Weed Sci. Lab., P.O. Box 350, Stoneville, MS 38776
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Abstract

Effects of temperature, relative humidity, and light on MSMA phytotoxicity to wild-type and arsenical herbicide-resistant biotypes of common cocklebur grown from seed collected in Mississippi were evaluated. In growth chamber studies, 20-d-old plants were sprayed with 0.5 kg ai/ha of MSMA, and after 7 d, fresh weight and chlorophyll content were measured to estimate phytotoxicity. All three environmental factors influenced the level of weed resistance. In studies with day/night temperatures of 30/25 C and 500 μmol/m2/s PPFD light with a 14-h photoperiod, phytotoxicity of MSMA at 40% relative humidity was minimal, but was significantly greater at 60 and 90% relative humidities. The resistant (R) biotype was affected less than the susceptible (S) biotype at the higher relative humidities. The level of resistance estimated by fresh weight reduction was greatest at 30/25 C, but was most pronounced at 35/30 C using chlorophyll measurements. Resistance was lowest at 25/20 C by either measurement. MSMA phytotoxicity occurred at light intensities of 75, 500, and 750 μmol/m2/s PPFD; however, biotypic response was greatest at 500, followed by 750 μmol/m2/s PPFD. Resistance of the (R) biotype to MSMA was not significant at 75 μmol/m2/s, suggesting that differentiation between the biotypes for MSMA sensitivity would be difficult under low light.

Keywords

MSMA, monosodium methylarsonic acid, common cocklebur, Xanthium strumarium L., # XANSTHerbicide resistanceXANST
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 809 - 814
Copyright
Copyright © 1996 by the Weed Science Society of America 

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