New Zealand Journal of Crop and Horticultural Science abstracts
Evaluation of fungicides for control of Alternaria leaf spot
of Pseudopanax
K. R. EVERETT*
New Zealand Nursery Research Centre
Massey University
Private Bag 11 222
Palmerston North, New Zealand
H. F. NEILSON
Department of Plant Science
Private Bag 11 222
Massey University
Palmerston North, New Zealand
*Present address: The Horticulture and Food Research Institute of
New Zealand, No. 1 Road, R D 2, Te Puke, New Zealand.
Abstract Alternaria tenuissima causes a leaf spot
disorder of Pseudopanax `Gold Splash', a New Zealand native shrub with
export potential. A range of fungicides viz., bitertanol, captafol,
chlorothalonil, dichlofluanid, iprodione, mancozeb, prochloraz, procymidone,
propineb, and vinclozolin were tested for efficacy against the pathogen. Three
techniques were used based on growth on: (1) fungicide amended media; (2) leaf
disc; and (3) intact plants. The efficacy of fungicides in agar was not
directly related to their effectiveness on leaf discs or on intact plants. In
contrast, all fungicides effective on leaf discs were also effective on intact
plants. The leaf disc technique showed that bitertanol, chlorothalonil,
iprodione, prochloraz, and vinclozolin became less effective 4 weeks following
application. In contrast, captafol, dichlofluanid, and propineb were effective
inhibitors throughout the 4 weeks tested by the leaf disc technique. On pot
plants in a greenhouse, mancozeb was the most effective protectant followed by
propineb, prochloraz, dichlofluanid, and captafol.
Keywords Alternaria tenuissima; Pseudopanax
leaf spot; fungicides; in vitro trials; disease control; leaf disc
technique
New Zealand Journal of Crop and Horticultural Science, 1996, Vol. 24:
267-272
0114-0671/96/2403-0267 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (421K); (scanned from paper original: notes about this process)
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