- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Pwynt Penodol mewn Amser (31/12/2020)
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Council Directive 93/85/EEC of 4 October 1993 on the control of potato ring rot
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Preliminary testing with this method should permit reproducible detection of 10 3 to 10 4 colony-forming units of C. m. subsp. sepedonicus per ml added to sample extracts that previously tested negative (preparation see Appendix 2).
Highest sensitivity of detection can be expected when using freshly prepared sample extract and optimal growth conditions. However, the method can be successfully applied to extracts that have been stored under glycerol at -68 to -86 °C. U.K.
Some varieties of eggplant provide an excellent selective enrichment medium for the growth of C. m. subsp. sepedonicus even in the absence of symptoms and also provide an excellent confirmatory host test.
Growth conditions should be optimal to reduce the risk of false negative test results.
For cultural details, see Appendix 8.
Slit inoculation U.K.
Inoculate the eggplant stems just above the cotyledons using a syringe fitted with a hypodermic needle (not less than 23 G). Distribute the sample between the eggplants.
Wilts may also be induced by populations of other bacteria or fungi present in the tuber tissue pellet. These include Ralstonia solanacearum, Erwinia carotovora subsp. carotovora and E. carotovora subsp. atroseptica, Erwinia chrysanthemi, Phoma exigua var. foveata , as well as large populations of saprophytic bacteria. In particular Erwinia chrysanthemi can cause leaf symptoms and wilt that is very similar to symptoms of C. m. sepedonicus . The only difference is blackening of the stems in case in Erwinia chrysanthemi infections. Other wilts can be distinguished from those caused by C. m. subsp. sepedonicus since whole leaves or whole plants wilt rapidly. Also a Gram stain can be prepared: this test will differentiate C. m. subsp. sepedonicus from Erwinia spp.
Interpretation of the bioassay test result.
Valid Bioassay test results are obtained when plants of the positive control show typical symptoms, the bacteria can be reisolated from these plants and no symptoms are found on the negative controls.
The bioassay test is negative if test plants are not infected by C. m. subsp. sepedonicus , and provided that C. m. subsp. sepedonicus is detected in positive controls.
The bioassay test is positive if the test plants are infected by C. m. subsp. sepedonicus .]
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