New Zealand Journal of Crop and Horticultural Science abstracts
Chitosan coating for inhibition of sclerotinia rot of carrots
L. H. CHEAH
B. B. C. PAGE
New Zealand Institute for Crop & Food
Research Limited
Private Bag 4005
Levin, New Zealand
R. SHEPHERD
Industrial Research Ltd
Box 31 310
Wellington, New Zealand
Abstract In in vitro tests, chitosan at 1, 2, and 4% (w/v)
significantly reduced the growth of
Sclerotinia sclerotiorum on potato
dextrose agar plates. The effect of chitosan coating on sclerotinia rot of
carrots (
Daucus carota L.) held at 22deg.C was also investigated. Carrot
roots were coated with chitosan solutions (2 or 4%) and inoculated with
mycelial plugs of
S. sclerotiorum culture. After 5 days of storage,
chitosan at both rates reduced significantly the incidence of rot (from 88 to
c. 28%) and also the lesion size (from 26 to c. 12 mm) of the rot on roots.
Microscope studies revealed that fungal mycelium exposed to chitosan appeared
to be deformed and dead, whereas untreated mycelium was normal in appearance.
Keywords carrots; chitosan; disease control; Sclerotinia
sclerotiorum; storage rot
New Zealand Journal of Crop and Horticultural Science, 1997, Vol. 25:
89-92
0114-0671/97/2501-0089 $2.50/0 (c) The Royal Society of New Zealand
1997
Short communication
PDF file of entire paper: medium quality (703K); (scanned from paper original: notes about this process)
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