Abstract
ABSTRACTInteraction of binary mixture of the two sulfonylurea herbicides: foramsulfuron or nicosulfuron with 2,4-D + MCPA, was evaluated in greenhouse experiments during 2010 and 2011 applying the additive dose model. Plants of redroot pigweed, common lambsquarters, common purslane and black nightshade were sprayed with seven doses of herbicides alone and in binary fixed-ratio mixtures. In total, 35 binary mixtures were studied in 7 separate experiments at ED90 response level. Results indicated that mixture of foramsulfuron + 2,4-D + MCPA was synergistic on redroot pigweed compared to additive interaction between nicosulfuron and 2,4-D + MCPA. Mixture of foramsulfuron + 2,4-D + MCPA was slightly antagonistic on common lambsquarters and an additive interaction was observed with both foramsulfuron and nicosulfuron + 2,4-D + MCPA on common purslane. Finally, the mixture of foramsulfuron or nicosulfuron + 2,4-D + MCPA on black nightshade was antagonistic especially in mixtures where the ratio of sulfonylurea herbicides was more than 2,4-D + MCPA. Totally, 2,4-D + MCPA in mixture with sulfonylurea herbicides especially foramsulfuron provided better control of redroot pigweed in comparison with herbicides applied alone and other herbicide mixtures on weeds.Abbreviations: 2,4-D + MCPA: ((2,4-Dichlorophenoxy) acetic acid plus (4-chloro-2-methylphenoxy) acetic acid); ADM: additive dose model; a.i.: active ingredient; ALS: acetolactate synthase; DAT: days after treatment; ED: effective dose; Foramsulfuron: (2-(N-((4,6-dimethoxypyrimidin-2-yl)carbamoyl)sulfamoyl)-4-formamido-N,N-dimethylbenzamide); Nicosulfuron: (2-[(4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoyl]-N,N-dimethylpyridine-3-carboxamide).
Highlights
A few herbicides have been registered for broadleaf weeds control in corn (Zea mays L.) in Iran
35 different binary mixtures of foramsulfuron or nicosulfuron with 2,4-D + MCPA in 7 separate experiments were studied on redroot pigweed (2 experiments), common lambsquarters (1 experiment), common purslane (2 experiments) and black nightshade (2 experiments)
Sulfonylurea herbicides mixture with 2,4-D + MCPA leads to chlorosis and epinasty of the leaves and petioles, bending and twisting, tissue swelling and bursting of weed stems, especially in mixtures where the 2,4D + MCPA mixture ratio was a much more higher than sulfonylurea herbicides
Summary
A few herbicides have been registered for broadleaf weeds control in corn (Zea mays L.) in Iran. Foramsulfuron and nicosulfuron are sulfonylurea herbicides inhibiting acetolactate synthase (ALS); the first enzyme in the pathway in the biosynthesis of branched-chain amino acids; valine, leucine and isoleucine in chloroplasts (Rao, 2000). These herbicides control many grass and some broadleaf weeds in corn, but they control grasses and sedges better than broadleaf weeds. The synthetic auxin herbicides like 2,4D + MCPA have been widely used in monocotyledonous crops for many years and effectively control a broad spectrum of broadleaf weeds in corn fields of Iran. Common ragweed (Ambrosia artemisiifolia L.) control was improved when dicamba was
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
