Group Title: CFREC-Apopka research report - Central Florida Research and Education Center-Apopka ; RH-89-6
Title: Susceptibility of 12 Dieffenbachia cultivars to Xanthomonas campestris pv. dieffenbachiae
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 Material Information
Title: Susceptibility of 12 Dieffenbachia cultivars to Xanthomonas campestris pv. dieffenbachiae
Series Title: CFREC-Apopka research report
Physical Description: 2 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Henny, R. J
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, IFAS, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1989
Subject: Dieffenbachia -- Diseases and pests -- Florida   ( lcsh )
Xanthomonas campestris -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Statement of Responsibility: A.R. Chase and R.J. Henny.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065877
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70552740

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not reflect current scientific knowledge
or recommendations. These texts
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site maintained by the Florida
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Copyright 2005, Board of Trustees, University
of Florida

1 (r

0 R Susceptibility of 12 Dieffenbachia Cultivars to Xanthomonas
oB campestris pv. dieffenbachiae
A.R. Chase and R.J. Henny

University of Florida, IFAS
Central Florida Research and Education Center Apopka
CFREC-Apopka Research Report, RH-89-6

This study was conducted to determine the sensitivity of twelve
Dieffenbachia cultivars to inoculation with the bacterium Xanthomonas
campestris pv. dieffenbachiae. Such information may be of value to growers
responsible for monitoring these crops for potential disease outbreaks.
A. Dieffenbachia Cultivars 12 different Dieffenbachia cultivars
(Table 1), consisting of commercial cultivars and unreleased
CFREC-Apopka hybrids, were inoculated with Xanthomonas in.foUr----.
separate tests initiated on:
Test No. Initiated Li'rai7

1 11-29-88
2 3-20-89
3 4-25-89
4 5-22-89

B. Growth Medium Plants were grown from tip cuttings rooted in
Vergro Container Mix A (Verlite Co., Tampa, FL).
C. Light and Temperature Light levels varied between 1650 and
2400 ft-c (75-80% shade) in shaded greenhouses while the
temperature range was 65-900F.
D. Inoculation Plants were artificially inoculated with a liquid
suspension of X. campestris pv. dieffenbachiae. This was done
under high humidity conditions provided by overhead mist to help
promote disease development.
E. Disease Severity This was rated in each test between 2 and 4
weeks after inoculation using the following scale:

Rating Disease Symptoms Cultivar Susceptibilit
1 No disease symptoms None
2 Tiny lesions scattered across Slight
the leaves at random
3 Appearance of water-soaking Moderate
around the expanding lesions,
also marginal necrosis and
4 All of the above symptoms plus High
veinal necrosis

1Professor of Plant Pathology, and Professor of Plant Genetics,
respectively. Central Florida Research and Education Center Apopka,
2807 Binion Road, Apopka, FL 32703.





Table 1. Susceptibility of 12 Dieffenbachia cultivars to Xanthomonas
campestris pv. dieffenbachiae.

Cultivar Average disease Overall
name rating susceptibility

Triumph 2.4 a
Victory 2.2 ab moderate

Hybrid 59301 1.9 bc
Starry Nights 1.9 bcd
Compacta 1.8 cd
Hybrid 65801 1.8 cd
Camille 1.8 cd slight
Memoria-Corsii 1.8 cd
Star White 1.6 cd
Bausei 1.5 d

Hybrid 649011 1.1 e very
Tropic Star 1.1 e resistant

zThe results presented are
between November 29, 1988
letters are significantly
5% level.

the means from 4 separate experiments conducted
and May 22, 1989. Means followed by different
different based on Duncan's multiple range test,

Dieffenbachia cultivars Triumph and Victory were most susceptible to
infection by Xanthomonas campestris pv. dieffenbachiae whereas Tropic Star
and Hybrid 649011 showed almost no disease symptoms. None of the cultivars
tested in this study could be classified as highly susceptible to the
pathogen. However, producers of the more susceptible cultivars should be
aware of their disease potential.


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