Vol. 54â2000 - NorthEastern Weed Science Society
Vol. 54â2000 - NorthEastern Weed Science Society Vol. 54â2000 - NorthEastern Weed Science Society
MESOTRIONE USE IN CORN WEED CONTROL SYSTEMS J. C. Jacobi and B. A. Lackey' ABSTRACT Mesotrione, also known as ZA 1296, is a new broadleaf weed herbicide being developed for field com. Mesotrione has activity on velvetleaf (Abutilon theophrasti Medicus), common cocklebur (Xanthium strumarium L.), pigweeds and waterhemps (Amaranthus spp.), common lambsquarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.), giant ragweed (Ambrosia trifida L.), jimsonweed (Datura stramonium L.), nightshade (Solanum spp.), common sunflower (Helianthus annuus L.), smartweeds (Polygonum spp.), and several other broadleaf weeds. Weed control systems where mesotrione could be used include (a) one-shot, preemergence applications with an acetanilide (such as acetochlor, metolachlor, or dimethenamid), (b) preplant bumdown applications with non-selective herbicides, (c) postemergence tankmixes of mesotrione with nicosulfuron, glyphosate, glufosinate and other postemergence grass herbicides, and (d) a preemergence grass herbicide followed by mesotrione applied postemergence. Postemergence applications of mesotrione should include crop oil concentrate alone or with UAN fertilizer. A premix of mesotrione and acetochlor is under development. Com exhibits excellent tolerance to mesotrione applications. 'ZENECA Ag Products, Dover, DE and Macedon, NY, respectively. 56
INFLUENCE OF CROWNVETCH WITH AND WITHOUT SECONDARY COVER CROPS ON ANNUAL WEED CONTROL AT REDUCED HERBICIDE RATES IN CORN N. L. Hartwig' ABSTRACT In previousresearch,crownvetch(CoronillaYIIii) when used as a perennialliving mulch and suppressed sufficientlyto preventcompetitionwith a companion com CZaI~ L.) crop, did oot contributeanythingto annualweed control.In this experiment,oats (a-a ~ L.) and a mixture of Canadianpea and triticale(X Iriticosecale Wittmack)were drilled as 2' cover cropsat 2.5 buiA and 1.00IblA resepectivelyinto establishedcrownvetchon April 3 to see if there wasan improvementin weed control overthat providedby crownvetchalonewhen treatedwith lowerrates ofherbicidesthatareat leastsomewhatselective(orbothcrownvetchandthe2° covercrops. To identifyweedsuppressivepotentialsof the different covers as well as the potential for reducingberbicideinputs, the followingweed controltreatmentswere randomly assignedto 12 plotswithin each cover crop block.Weeds were controlledwith 1/4 X, II2X, and IX application rates (levels)of the following earlypost emergencebroadcast appliedherbicidetreatments.The com was planted 00 April 30, ooe monthbefore herbicide applicationswere made. On May 27, comwasin thespikestageandcrownvetchwas 3-4"~ oats6_8 11 andpea+ triticale6-8". I. May 27, '97 - rimsulfuron + thifensu1fiJronmethyl (Basis®) plus atrazine+ metolachlor (Bicep II®)I @ 0.0125 + 1335 + 1,6 #aj/A* 2. May 27, '97 - rimsulfuron + thifensulfuron methyl (Basis®) plus isoxaflutole (Balance®)+ metolachlor (Dual n®)1 @ 0,0125 + 0.07 + 1,95 #ai1A* 3. May 28, '97 - rimsulfuron + thifensulfiJronmethyl (Basis®) plus atrazine + imazethapyr (Contour®) + metolachlor (Dual n®)1 @ 0,0125 + 0,5 + 0,0625 + I 95 #aj/A* 4. May 28, '97 - rimsulfuron + thifensulfuronmethyl (Basis®)plus imazethapyr (Pursuit®) plus metolachlor (Dual n®)1 @ 0.0125 + 0 0625 + I 95* (* = IX rates) 1Cbas.,.4l(NIS @0.25%vlv+ UAN @ 1.5%vlv) includedwith all the above treatments. The soil was a Hagerstown SiltLoam (Typic Hapludult)with a pH of 6.8. All treatments wereapplied with a tractor mounted smallplot sprayerwith XR80015flat fan nozzlesat 28 psi in 10,20 and 40 gallA ofwsler. 'Pioneer 3395 IR' (109 day) com was planted io 15by 25 ft. plots with a six row no-till planter in 30 in. rows on April 30, 1997with 100lb/A of 10-30-10fertilizerin therow.Imidazolinoneresistantcomwasplantedsinceimazethapyr(Pursuit)wasa componentof of treatments 3 and 4. Urea @ 160Ib NtA was applied broadcast at com plantingtime. Therewas an excellentstandof oats, Canadianpea and triticalein the crownvetchby late May. Annual grass was virtually 100'10controlledby the herbicides at all rates but broad1eafweed control;triazine resistant pigweed (AmlUllD\husbybridus) and lambsquarters(ChenoDodium B!lmm)wasgenerally significantlyless at lower herbiciderates without a cover crop fOrthe first two herbicidemixtures(Table I). Weed controlwas generallysignificantlyimproved (>93%) even at the lowestherbiciderateswith crownvetchand slightlybetteryet with 2' cover crops.Althoughaverage com height,populationand yieldwere all significantlyreduced,especiallyat lowerherbiciderates,it wasnotonlydueto increasedcrownvetchgrowthbutrathercompetitionfroma combinationof crowovtetchand the secondarycover crops (oats,triticale) and uncontrolledannualbroadleafweeds. At this point, it would appearthat annualweed control is possiblewith competitionfrom a partiallycontrolledcovercropbutattheexpenseof growthandyieldofcom, especiallyin a yearof inadequaterainfall. I Prof. of Weed Sci., Dept. of Agronomy,PennsylvaniaState University,UniversityPark, PA. 16802. 57
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MESOTRIONE USE IN CORN WEED CONTROL SYSTEMS<br />
J. C. Jacobi and B. A. Lackey'<br />
ABSTRACT<br />
Mesotrione, also known as ZA 1296, is a new broadleaf weed herbicide being<br />
developed for field com. Mesotrione has activity on velvetleaf (Abutilon theophrasti<br />
Medicus), common cocklebur (Xanthium strumarium L.), pigweeds and waterhemps<br />
(Amaranthus spp.), common lambsquarters (Chenopodium album L.), common<br />
ragweed (Ambrosia artemisiifolia L.), giant ragweed (Ambrosia trifida L.), jimsonweed<br />
(Datura stramonium L.), nightshade (Solanum spp.), common sunflower (Helianthus<br />
annuus L.), smartweeds (Polygonum spp.), and several other broadleaf weeds. <strong>Weed</strong><br />
control systems where mesotrione could be used include (a) one-shot, preemergence<br />
applications with an acetanilide (such as acetochlor, metolachlor, or dimethenamid), (b)<br />
preplant bumdown applications with non-selective herbicides, (c) postemergence<br />
tankmixes of mesotrione with nicosulfuron, glyphosate, glufosinate and other<br />
postemergence grass herbicides, and (d) a preemergence grass herbicide followed by<br />
mesotrione applied postemergence. Postemergence applications of mesotrione should<br />
include crop oil concentrate alone or with UAN fertilizer. A premix of mesotrione and<br />
acetochlor is under development. Com exhibits excellent tolerance to mesotrione<br />
applications.<br />
'ZENECA Ag Products, Dover, DE and Macedon, NY, respectively.<br />
56
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