Pyrasulfotole & bromoxynil response in grain sorghum.

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dc.contributor.author Lally, Nathan Gerard
dc.date.accessioned 2011-08-11T15:24:39Z
dc.date.available 2011-08-11T15:24:39Z
dc.date.issued 2011-08-11
dc.identifier.uri http://hdl.handle.net/2097/12002
dc.description.abstract Postemergent herbicide options for grain sorghum are limited and increasingly challenged by the development of herbicide resistant weeds. The herbicide pyrasulfotole & bromoxynil (P&B) was evaluated for potential use in grain sorghum and for control of a suspected HPPD-resistant Palmer amaranth population. Field experiments were conducted near Manhattan and Rossville, KS, to evaluate grain sorghum response to P&B with and without 2,4-D applied to growth stages from 1-leaf through the flag leaf stage and tankmixed with 2,4-D ester, amine, or dicamba applied to 3- and 6-leaf sorghum. The addition of 2,4-D ester did not reduce sorghum injury from P&B alone. Increasing the rate of P&B increased injury. Treatments applied to 1- and 4-leaf sorghum were injured the most. All P&B treated sorghum, regardless of timing, yielded 8 to 20% less than the untreated check. Pyrasulfotole & bromoxynil applied alone or with dicamba injured sorghum less than 2,4-D applied at 3- or 6-leaf. Increasing the rate from 140 to 280 g ha[superscript]-1 2,4-D amine or ester increased injury by 6 to 11%. Yields were lowest when P&B was applied with 2,4-D amine at 140 g ha[superscript]-1 and 2,4-D amine or ester at 280 g ha[superscript]-1 compared to all other treatments. Increasing the rate of growth regulator herbicides decreased yields by 8% and did not reduce crop injury from P&B alone. Greenhouse and field experiments were conducted to evaluate the response of two suspected P&B-resistant (R1 & R2) and one susceptible (S) Palmer amaranth population to P&B, atrazine, and tembotrione. Herbicides were applied when plants were 7 to 19 cm tall. The S population was controlled with less than field use rates. A resistance index (RI) of 4.8 to 11.0 was determined for R1 and R2 in greenhouse and field experiments. Tembotrione controlled 100% of S in all experiments, while providing 63 to 86% injury to R1 and R2 populations. Atrazine did not control the resistant populations. Pyrasofotole & bromoxynil will be an valuable tool for weed control in sorghum, however, Palmer amaranth populations exist that will not be controlled. en_US
dc.description.sponsorship Bayer Crop Science; Kansas Grain Sorghum Commission en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Pyrasulfotole & bromoxynil en_US
dc.subject HPPD inhibitors en_US
dc.subject Palmer amaranth en_US
dc.subject Grain sorghum en_US
dc.title Pyrasulfotole & bromoxynil response in grain sorghum. en_US
dc.type Thesis en_US
dc.description.degree Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Agronomy en_US
dc.description.advisor Curtis R. Thompson en_US
dc.description.advisor Curtis R. Thompson en_US
dc.subject.umi Agronomy (0285) en_US
dc.date.published 2011 en_US
dc.date.graduationmonth August en_US


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