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Brian A. Kahn, John P. Damicone and Raymond Joe Schatzer

Benomyl was compared with copper hydroxide, azoxystrobin, tebuconazole, acibenzolar-S-methyl, and basic copper sulfate for efficacy of cercospora leaf spot [incited by Cercospora brassicicola P. Henn] management on turnip greens [Brassica rapa L. var. (DC.) Metzg. utilis]. Treatments included various application times and were evaluated in three field experiments over 2 years. The few yield effects that occurred were not consistent between years. Copper hydroxide and basic copper sulfate were not useful alternatives to benomyl due to a combination of phytotoxicity symptoms and ineffective disease control. Inconsistent results were observed with acibenzolar-S-methyl. A single, early application of tebuconazole greatly reduced cercospora leaf spot severity relative to the control in both years. Tebuconazole may be a good alternative to benomyl if a label can be obtained. Multiple (at least two) applications of azoxystrobin may be needed to achieve the same degree of cercospora leaf spot control as would result from a single properly timed application of benomyl. Although azoxystrobin is now labeled for turnip greens, grower costs will likely increase as a result of benomyl being discontinued. Chemical names used: methyl-1-[(butylamino)carbonyl]-H-benzimidazol-2-ylcarbamate (benomyl); methyl (E)-2-{2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl}-3-methoxyacrylate (azoxystrobin); alpha-[2-(4-chlorophenyl)ethyl]-alpha-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (tebuconazole); 1,2,3-benzothiadiazole-7-thiocarboxylic acid-S-methyl-ester (acibenzolar-S-methyl).

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Nathaniel A. Mitkowski and Arielle Chaves

moderate risk for resistance development ( FRAC, 2012 ). Active ingredients that are currently registered for use in the United States include: fenarimol, myclobutanil, metconazole, propiconazole, tebuconazole, triadimefon, and triticonazole (fenarimol use

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M.L. Elliott

Eight demethylation inhibiting (DMI) fungicides were applied at two rates to `Tifgreen' bermudagrass [Cynodon dactylon (L.) Pers. ×x C. transvaalensis Burtt-Davy] to determine if DMI fungicides would produce a plant growth regulation effect on healthy bermudagrass. After three applications at 28- to 30-day intervals, compared to the control, both rates of cyproconazole, bromuconazole, propiconazole and triadimefon and the high rate of myclobutanil significantly decreased turfgrass quality on at least one evaluation date in each year of the study. The low rate of myclobutanil and both rates of tebuconazole and fenbuconazole did not adversely effect turfgrass quality in either year. For both rates of fenarimol, there was only one date during both years of the study when the turfgrass quality was significantly lower than the control. These results demonstrate the wide range of physiological activity the DMI fungicides can have on bermudagrass.

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Yonghong Guo, Matthew Kramer and Margaret Pooler

powdery mildew on sour cherry with alternate-side applications of fenarimol, myclobutanil, and tebuconazole Plant Dis. 77 703 706 Joshua, J. Mmbaga, M.T. 2015 Perpetuation of cherry leaf spot disease in ornamental cherry J. Phytopathol. 163 194 201 Joshua

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Diana R. Cochran, Richard L. Harkess, Patricia R. Knight, Maria Tomaso-Peterson, Eugene K. Blythe and Charles H. Gilliam

stimulate the production of antioxidant enzymes. Furthermore, several fungicides (carbendazim, tebuconazole, azoxystrobin, and JS399-19) have produced a decrease in 0 2 – levels in flag leaves of winter wheat ( Zhang et al., 2010 ). Therefore, Regalia

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Ruying Wang, James W. Hempfling, Bruce B. Clarke and James A. Murphy

.i./ha, tebuconazole (α-[2-(4-chlorophenyl)ethyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol) at 0.7 kg a.i./ha, or polyoxin D zinc salt (1:1) {Zinc 5-[[2-amino-5-O-(aminocarbonyl)-2-deoxy-L-xylonoyl]amino]-1-(5-carboxy-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-1

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Ying Li, Liyi Zhang, Zhen Zhang, Peihua Cong and Zong-Ming Cheng

and Malus species for resistance to alternaria blotch and established a modified six-class disease scale for the rating system. Although use of fungicides such as mancozeb, ziram, thiram, oxine-copper, iminoctadine, difenoconazole, tebuconazole

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Marcos R. Sachet, Idemir Citadin, Silvia Scariotto, Idalmir dos Santos, Pedro H. Zydek and Maria do Carmo B. Raseira

sulfur applications during winter followed by applications of azoxystrobin and tebuconazole during the growing season to control the leaf rust caused by Tranzschelia discolor (Fuckel). None of the fungicides used control BLS disease. Fifteen genotypes

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Barrett R. Gruber, Libby R.R. Davies and Patricia S. McManus

(2007) incorporated azoxystrobin and tebuconazole fungicides into a copper-based fungicide program but did not observe effects on fruit weight of peach and nectarine compared with controls. There have been mixed consequences for fruit quality

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Peter T. Hyde, Elizabeth D. Earle and Martha A. Mutschler

direct-sown trials in 2008 and 2009 were treated before sowing to control onion maggot ( Delia antiqua ) and onion smut ( Urocystis cepulae ). The seeds were coated with tebuconazole (Raxcil 2.6 F; Bayer AG, Leverkusen, Germany) 250 mg/100 g seed, thiram