New Zealand Journal of Crop and Horticultural Science abstracts
Control of bacterial soft rot of calla (Zantedeschia spp.) by
pathogen exclusion, elimination and removal
P. J. Wright
New Zealand Institute for Crop and Food
Research Limited
Cronin Road, RD1
Pukekohe, New Zealand
email: wrightp@crop.cri.nz
C. M. Triggs
Department of Statistics
University of Auckland
Private Bag 92 019
Auckland, New Zealand
G. K. Burge
New Zealand Institute for Crop and Food
Research Limited
Private Bag 11 600
Palmerston North, New Zealand
Abstract The incidence and severity of bacterial soft
rot of calla (Zantedeschia spp.) tubers at harvest were substantially
reduced by planting method, chemical control measures, and removal of infected
plant material. Callas grown using a sawdust-shadecloth method had fewer
soft-rotted plants and tubers than callas grown in soil. Dipping tubers before
planting in an aqueous solution of 0.08% copper hydroxide, 0.12% thiram,
plus 0.03% benomyl reduced plant and tuber losses from bacterial soft rot.
Drenching plants during the growing season with an aqueous solution of 0.12%
thiram, 0.08% copper hydroxide, plus 0.15% quintozene gave further control
against rots. Weekly removal of rotting foliage and tubers during the growing
season also reduced levels of plant and tuber soft rots. This study has demonstrated
that effective control of calla soft rot can be achieved using disease management
that combines appropriate pathogen exclusion, elimination, and removal methods.
Keywords Zantedeschia spp.; calla; soft rot;
Erwinia carotovora; agronomic methods; chemical control; sawdust growing
media
H04064; Online publication date 13 May 2005 Received 23 July 2004; accepted
10 February 2005
New Zealand Journal of Crop and Horticultural Science, 2005, Vol. 33:
117-123
0014-0671/05/3302-0117 © The Royal Society of New Zealand 2005
PDF file of entire paper: Print-quality (93K) |
screen-quality (83K)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
