Group Title: Research report - West Florida Research and Education Center ; 1999-8
Title: Galling response of herbaceous and woody landscape species grown in Meloidogyne incognita- and M. arenia- infested soils
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 Material Information
Title: Galling response of herbaceous and woody landscape species grown in Meloidogyne incognita- and M. arenia- infested soils
Series Title: Research report
Physical Description: 2 leaves : ; 28 cm
Language: English
Creator: Thetford, Mack
Kinloch, Robert A
West Florida Research and Education Center
Publisher: University of Florida, West Florida Research and Education Center
Place of Publication: Jay Fla
Publication Date: 1999]
 Subjects
Subject: Galls (Botany) -- Florida   ( lcsh )
Meloidogyne -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Mack Thetford and Robert A. Kinloch.
General Note: Caption title.
General Note: "March, 1999."
 Record Information
Bibliographic ID: UF00053542
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 62312309

Full Text





Q^ g Galling Response of Herbaceous and Woody Landscape Species
Grown in Meloidogyne incognita- and M. arenaria-infested soils. SCIEtCE LIBM
MAR 2 9 QI
Mack Thetford and Robert A. Kinloch
University of Florida
West Florida Research and Education Center

Research Report 1999-8


The root-knot nematode species, Meloidogyne incognita and M. arenaria are widespread in
the soils of northwest Florida. Studies have been initiated at the West Florida Research and
Education Center to determine the susceptibility of horticultural crops to indigenous populations
of these plant-parasitic nematodes.
During 1998, three Rudbeckia hirta cultivars and three woody landscape species were grown
in two field soils separately infested with the southern root-knot nematode, Meloidogyne
incognita race 1, and the peanut root-knot nematode, Meloidogyne arenaria race 2 at the
West Florida Research and Education Center, Santa Rosa County, FL. Rudbeckia transplants
were produced from seed germinated in a 36-cell plug flat using Metro Mix 220. Transplants of
Buddleia davidii 'Cornwall Blue,' Ilex crenata 'Helleri' and 'Green Lustre' woody landscape
species were produced from stem cuttings grown in a similar flat using Fafard Mix #52. Twelve
transplants of each species were potted into 15-cm diameter pots with 6 plants potted in M
arenaria- and 6 plants in M. incognita-infested soil. Seeds of 'Rutgers' tomato (Lycopersicon
esculentum) were sown in 15-cm diameter pots containing separate infestations ofM. arenaria-
or M. incognita to serve as nematode-susceptible controls. Plants were maintained in a
greenhouse and grown for a period of three months. Evaluations of R. hirta were conducted on
13 July 1998 and of the woody ornamentals on 4 December 1998. Root systems were washed
free of soil and galling was rated using the following indices: 0 = no galling; 1 = 1 2 galls; 2 = 3 -
10 galls; 3 = 11 30 galls; 4 = 31 100 galls and 5 >100 galls per root system (Taylor & Sasser,
1978).
All R. hirta entries had galling ratings of 0 (Table 1) while the tomato had ratings of 1.6 for M
incognita and 4.8 forM. arenaria, respectively. Based on these data we conclude that R. hirta is
an unlikely host for these two root-knot nematode species. However, due to the low galling
response to M. incognita, this aspect of the study should be repeated.
Galling data for B. davidii 'Cornwall Blue' indicate this cultivar is a highly susceptible host for
both M. incognita and M. arenaria. Galling ratings were similar to those recorded for the highly
susceptible Rutgers tomato (Table 2). The degree of galling on 'Cornwall Blue' was so severe
that very few small roots were evident and the support and transport roots were distorted more
severely than those of the tomato.
Data for the two cultivars of/. crenata indicate this species is a host of low to moderate
susceptibility for these two root knot nematodes. If it is considered that a galling score of 1 or less
indicates a good level of resistance, both cultivars would qualify as resistant to M. arenaria, but
only 'Helleri' would qualify as resistant to M. incognita. A higher incidence of galling on 'Green
Lustre' grown in M. incognita-infested soil suggests this cultivar is not resistant to this root-knot


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species. Further studies are needed to determine the reproduction of both root-knot nematode
species on I. crenata to determine the potential of this woody landscape species for increasing soil
infestations of these nematodes. These results suggest a need for evaluating root-knot nematode
susceptibility as a criterion for selecting potential Ilex crenata cultivars for production in
northwest Florida.

Literature Cited

Taylor, A,. and J. N. Sasser. 1978. Biology, identification and control of root-knot
nematodes(Meloidogyne species). Raleigh, NC: North Carolina State University Graphics.


Table 1. Galling of Rudbeckia hirta cultivars grown in Meloidogyne incognita- and M. arenaria-infested soils
at the West Florida Research and Education Center, 1998.
Meloidogvne incognita Meloidoevne arenaria

Species Galling (0-5) Galling (0-5)

Rudbeckia hirta (Central Florida) 0 0

Rudbeckia hirta (Wildseed Farms) 0 0

Rudbeckia hirta (native zone 8B) 0 0

Lycopersicon esculentum 'Rutgers' 1.6 4.8




Table 2. Galling of Buddleia davidii 'Cornwall Blue' and two Ilex crenata cultivars grown in Meloidogyne
incognita- and M. arenaria-infested soils at the West Florida Research and Education Center, 1998.
Meloidogyne incognita Meloidogvne arenaria

Species Galling (0-5) Galling (0-5)

Buddleia davidii 'Cornwall Blue' 5 4

Ilex crenata 'Helleri' 1 1

Ilex crenata 'Green Lustre' 2.2 1
Lycopersicon esculentum 'Rutgers' 5 5


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