New Zealand Journal of Crop and Horticultural Science abstracts
Biological control of Phytophthora megasperma var. sojae,
causal agent of Phytophthora rot of asparagus, by Pseudomonas
aureofaciens PA147-2: a preliminary field trial
SCOTT A. C. GODFREY1,*
MARK W. SILBY1
PETER G. FALLOON2
H. KHRIS MAHANTY1
1Department of Plant and Microbial Sciences
University of Canterbury
Ilam Road, Christchurch 8004
New Zealand
2Aspara Pacific Ltd
P. O. Box 36, Lincoln
New Zealand
*Present address: New Zealand Institute for Crop & Food
Research Limited, Private Bag 4704, Christchurch, New Zealand.
Abstract Pseudomonas aureofaciens PA147-2
produces an antibiotic that inhibits the growth of Phytophthora
megasperma var. sojae, the causative agent of root-rot disease of
asparagus (Asparagus officinalis). To assess the potential use of
PA147-2 as a biocontrol organism, we report preliminary findings of a field
application of PA147-2 to asparagus crowns. To determine the ability of PA147-2
to suppress Phytophthora rot, asparagus crowns inoculated with PA147-2 were
planted in Eyre shallow fine sandy loam soil inoculated with P.
megasperma var. sojae. During the 6-month trials, PA147-2 was
isolated from inoculation points with a decreasing frequency. Harvesting and
analysis of asparagus plants revealed that inoculation of crowns with PA147-2
resulted in a 55.8% increase of fern dry weight in comparison to untreated
plants. Preliminary field trial results suggest the direct inoculation of
asparagus crowns with PA147-2 before planting causes a statistically
significant increase in the yield of plant material in the presence of P.
megasperma var. sojae.
Keywords Pseudomonas aureofaciens; Phytophthora
megasperma var. sojae; Asparagus officinalis; biocontrol;
bacterial survival; Ridomilreg. 250EC
H99019
Received 6 May 1999; accepted 23 March 2000
PDF file of entire paper: medium quality (556K); (scanned from paper original: notes about this process)
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