New Zealand Journal of Crop and Horticultural Science abstracts
Effects of cessation of irrigation and time of lifting of tubers on bacterial
soft rot of calla (Zantedeschia spp.) tubers
P. J. Wright
New Zealand Institute for Crop & Food
Research Limited
Cronin Road, RD1
Pukekohe, New Zealand
email: wrightp@crop.cri.nz
G. K. Burge
New Zealand Institute for Crop & Food
Research Limited
Private Bag 11 600
Palmerston North, New Zealand
C. M. Triggs
Department of Statistics
University of Auckland
Private Bag 92 019
Auckland, New Zealand
Abstract The incidence and severity of bacterial soft
rot of calla (Zantedeschia spp.) tubers at harvest were affected by
the time that irrigation ceased and the time when tubers were lifted from
the ground. The longer that tubers were left in the ground after the onset
of foliage senescence, the greater the levels of soft rot. When irrigation
was terminated early, foliage senescence occurred more rapidly than when
irrigation was terminated later. Early cessation of irrigation reduced the
incidence and severity of tuber rots at lifting without greatly affecting
tuber size. Early lifting of tubers reduced the incidence of rots but also
reduced tuber yield because tubers were still actively growing.
Keywords Zantedeschia spp.; calla; soft rot;
Erwinia carotovora; cultural control; irrigation; tuber harvest
H02047 Received 9 July 2002; accepted 5 September 2002; published 9 December
2002
New Zealand Journal of Crop and Horticultural Science, 2002, Vol. 30:
265-272
0014-0671/02/3004-0265 $7.00 © The Royal Society of New Zealand
2002
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