Effect of Postsymptom Application of Fungicides on Urediniospore Production by Puccinia triticina on Wheat and P. hemerocallidis on Daylily

被引:15
作者
Buck, J. W. [1 ]
Wise, K. [1 ]
Dong, W. [1 ]
机构
[1] Univ Georgia, Dept Plant Pathol, Griffin, GA 30223 USA
关键词
PHYSICAL-MODES; DOWNY MILDEW; RUST FUNGI; RESISTANCE; AZOXYSTROBIN; GERMINATION; SEED;
D O I
10.1094/PDIS-09-10-0646
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Greenhouse experiments were conducted to evaluate the effect of post-symptomatic fungicide applications on urediniospore production of leaf rust of wheat, Puccinia triticina, and daylily rust, P hemerocallidis. Fungicides from five chemical classes were evaluated for their effect on urediniospore production at 24-h intervals post application for 96 h. The quinone outside inhibitor (QoI) fungicide (azoxystrobin) significantly reduced cumulative urediniospore production by P. triticina (40.1 and 11.3% of control) and P hemerocallidis (37.9 and 35.6% of control) in both trials. The demethylation inhibitor, myclobutanil, significantly reduced urediniospore production by P. hemerocallidis 24 h post treatment in both trials and cumulative production in one trial. Myclobutanil did not affect urediniospore production by P. triticina. Four QoI fungicides significantly reduced urediniospore production by P. triticina at all collection times (24, 48, and 72 h) and cumulative production in both trials. No differences were observed between the QoI fungicides with P triticina. The four QoI fungicides significantly reduced urediniospore production by P hemerocallidis compared with the nonfungicide control, with significantly fewer urediniospores produced in the pyraclostrobin-treated lesions compared with azoxystrobin, fluoxastrobin, and trifloxystrobin. Differences in leaf morphology between daylily and wheat such as leaf thickness and waxiness may contribute to the differences observed between the two pathosystems. The significant reductions in urediniospore production by postsymptom applications of QoI fungicides, combined with their known fungistatic properties, suggest that these chemistries would be useful for reducing the spread of viable inoculum to noninfested plants.
引用
收藏
页码:325 / 330
页数:6
相关论文
共 35 条
[1]   Protective, curative and eradicant activity of the strobilurin fungicide azoxystrobin against Cercospora beticola and Erysiphe betae [J].
Anesiadis, T ;
Karaoglanidis, GS ;
Tzavella-Klonari, K .
JOURNAL OF PHYTOPATHOLOGY, 2003, 151 (11-12) :647-651
[2]   Review of strobilurin fungicide chemicals [J].
Balba, Hamdy .
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 2007, 42 (04) :441-451
[3]   The strobilurin fungicides [J].
Bartlett, DW ;
Clough, JM ;
Godwin, JR ;
Hall, AA ;
Hamer, M ;
Parr-Dobrzanski, B .
PEST MANAGEMENT SCIENCE, 2002, 58 (07) :649-662
[4]   MYCLOBUTANIL AS A CURATIVE AGENT FOR CHRYSANTHEMUM WHITE RUST [J].
BONDE, MR ;
PETERSON, L ;
RIZVI, SA ;
SMILANICK, JL .
PLANT DISEASE, 1995, 79 (05) :500-505
[5]   Effect of light exposure on in vitro germination and germ tube growth of eight species of rust fungi [J].
Buck, James W. ;
Dong, Weibo ;
Mueller, Daren S. .
MYCOLOGIA, 2010, 102 (05) :1134-1140
[6]   The effect of fungicides on urediniospore germination and disease development of daylily rust [J].
Buck, JW ;
Williams-Woodward, JL .
CROP PROTECTION, 2003, 22 (01) :135-140
[7]  
BUCK JW, 2009, PLANT DIS MAN REP, V3, pOT17, DOI DOI 10.1094/PDMR03
[8]  
BUCK JW, 2007, PLANT HLTH PROGR, DOI DOI 10.1094/PHP-2007-1031-02-RS
[9]   An Unusual Occurrence of Southern Rust, Caused by Rpp9-virulent Puccinia polysora, on Corn in Southwestern Georgia [J].
Dolezal, W. ;
Tiwari, K. ;
Kemerait, R. ;
Kichler, J. ;
Sapp, P. ;
Pataky, J. .
PLANT DISEASE, 2009, 93 (06) :676-676
[10]   Mechanisms of resistance to Qol fungicides in phytopathogenic fungi [J].
Fernandez-Ortuno, Dolores ;
Tores, Juan A. ;
De Vicente, Antonio ;
Perez-Garcia, Alejandro .
INTERNATIONAL MICROBIOLOGY, 2008, 11 (01) :1-9