Problems of Agrobacterium tumefaciens in planting material and its control

Autor: C. M. E. Garrett
Rok vydání: 1987
Předmět:
Zdroj: EPPO Bulletin. 17:263-268
ISSN: 1365-2338
0250-8052
DOI: 10.1111/j.1365-2338.1987.tb00037.x
Popis: Crown gall caused by Agrobacterium tumefaciens is a problem in many European nurseries especially on stone fruits, apples and some herbaceous hosts (biovars 1 and 2) and on grapevines (biovar 3). Nursery infection can arise from land infested with the pathogen. Disease incidence can be reduced to some extent by cultural methods such as crop rotation, minimizing wounding and selection of less susceptible cultivars. The best control of infection is the use of a pre-planting dip in the antagonist A. radiobacter strain 84, which gives excellent control of strains of the pathogen harbouring the nopaline-type Ti plasmid. The antagonist is not yet cleared for use in all European countries. This biological control is sometimes ineffective because of the presence of mixed populations of sensitive and resistant strains of the pathogen, use of too low inoculum doses of the antagonist or because the host plant affects the antagonist action. All controls are preventive and not curative, so latent infections in layer or stool beds cannot be prevented from developing. Control of the strains of the pathogen insensitive to strain 84 may be possible in future by the use of other antagonistic organisms or by genetic manipulation of strain 84. Until such a new development becomes available, growers must make careful selection of propagating material to minimize the risk of spreading infection.
Databáze: OpenAIRE
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