Field and laboratory evaluations of fungicides for the control of brown spot ( Corynespora cassiicola ) and black spot ( Asperisporium caricae ) of papaya in far north Queensland, Australia

Several chemicals including strobilurins (pyraclostrobin and azoxystrobin), triazoles (difenoconazole and tebuconazole), dithiocarbamates (propineb, metiram, ziram and mancozeb) and the phthalimide chlorothalonil were evaluated in three field experiments in north Queensland, Australia, for the contr...

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Published inAustralasian plant pathology Vol. 37; no. 6; pp. 552 - 558
Main Authors Vawdrey, L.L, Grice, K.R.E, Westerhuis, D
Format Journal Article
LanguageEnglish
Published Dordrecht Collingwood, Victoria: CSIRO Publishing 01.01.2008
Springer Netherlands
Springer Nature B.V
Subjects
Agriculture
azoxystrobin
Biomedical and Life Sciences
Black spot
Brown spot
Carica papaya
Chemicals
Chlorothalonil
Corynespora cassiicola
Difenoconazole
Ecology
Entomology
Fruits
Fungicides
Laboratory testing
Life Sciences
Mancozeb
Pathology
phthalimide
Plant Pathology
Plant Sciences
Sprays
strobilurin
Tebuconazole
triazoles
Australia, Queensland
Carica papaya
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Summary:Several chemicals including strobilurins (pyraclostrobin and azoxystrobin), triazoles (difenoconazole and tebuconazole), dithiocarbamates (propineb, metiram, ziram and mancozeb) and the phthalimide chlorothalonil were evaluated in three field experiments in north Queensland, Australia, for the control of brown spot (caused by Corynespora cassiicola ) and black spot (caused by Asperisporium caricae ) of papaya. Chlorothalonil and pyraclostrobin were shown to be more effective than the industry standard, mancozeb, for the control of brown spot. In the black spot experiments, difenoconazole, pyraclostrobin and chlorothalonil used alone or in spray programs were as effective as, or better than, the industry standards, mancozeb and tebuconazole. Plants treated with pyraclostrobin and difenoconazole had more fruit unaffected by black spot (97% and 99% respectively) than plants treated with tebuconazole (51%), mancozeb (20%) and the untreated controls (1%). Laboratory tests also showed that A. caricae was more sensitive to difenoconazole (EC 50 of 2 ppm) than tebuconazole (EC 50 of 14 ppm). In 2007, off-label permits were obtained for chlorothalonil for control of brown spot and difenoconazole and chlorothalonil for the control of black spot of papaya.
Bibliography:Australasian Plant Pathology publishes new and significant research in all fields of plant pathology. Distribution and readership of the journal is worldwide, but emphasis is placed on strengthening its role as the major publishing outlet in the Australasian region. Australasia is interpreted in the broadest sense to include not only Australia, New Zealand and Papua New Guinea, but also the Indian Ocean, Pacific and Asian regions
http://dx.doi.org/10.1071/AP08055
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0815-3191
1448-6032
DOI:10.1071/AP08055