NDLI: Monitoring for resistant populations of Xanthomonas citri subsp. citri and epiphytic bacteria on citrus trees treated with copper or streptomycin using a new semi-selective medium

Content Provider	Springer Nature Link
Author	Behlau, Franklin Jones, Jeffrey B. Myers, Monty E. Graham, James H.
Copyright Year	2011
Abstract	Streptomycin has been tested as an alternative to copper bactericides, which are routinely used for the control of citrus canker (Xanthomonas citri subsp. citri, Xcc) in citrus producing areas where the disease is endemic. A major concern is that excessive use of copper as a bactericide may lead to development of copper-resistant strains of Xcc. In this study, we developed a semi-selective medium to recover copper or streptomycin-resistant strains of Xcc from citrus leaves. The newly developed semi-selective medium was used to monitor the effect of a 21-day-interval copper or streptomycin spray program on Xcc for three consecutive seasons and on citrus epiphytic bacterial populations for two seasons in a commercial grapefruit grove. Although, no copper- or streptomycin-resistant strains of Xcc were isolated after three seasons, we observed a significant increase over time in the frequency of citrus epiphytic bacteria resistant to these chemicals. Overall, the proportion of epiphytic bacteria resistant to streptomycin on treated and untreated leaves was proportionally lower than the copper-resistant bacterial population. When application of each bactericide was suspended for the season, the proportion of bactericide-resistant bacteria in the epiphytic population decreased to that of the non-treated bacterial population. Availability of an alternative bactericide, such as streptomycin, to integrate into a copper-based program would reduce the amount of each bactericide sprayed in citrus orchards and possibly lower the selection pressure for bacterial resistance to these chemicals.
Starting Page	259
Ending Page	270
Page Count	12
File Format	PDF
ISSN	09291873
Journal	European Journal of Plant Pathology
Volume Number	132
Issue Number	2
e-ISSN	15738469
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-09-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bactericides Chemical control Citrus canker MGY-KCH agar Agriculture Plant Pathology Life Sciences Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Horticulture Agronomy and Crop Science

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