Despite the continuous effort of conventional methods to make a food secured world, there exist numerous unsolved problems that need to be dealt with. Clearly Pff is a very stable and long-lived pathogen able to retain its genetic integrity and lie dormant in soil for many years, ensuring its survival between epidemiologically favourable conditions which occur erratically.Įver-increasing population and climate change are the two major threats to food security across the globe. The fingerprints of the single variant isolate matched that of an isolation made by Hickman in the 1950s, originally used to inoculate the site. Races used to inoculate the site in the 1970s were recovered. The isolates differed little in race type, and the majority were genetically identical at 433 AFLP loci. The race designation of 18 recovered isolates were determined and AFLP fingerprint patterns of some of these and their single-spore derivatives were analysed. Site elevation and the distribution of red core infected plants showed a strong correlation, with a higher frequency of infected and dead plants in the lowest areas of the field. Rapid and widespread red core infection was observed, which provided good evidence that oospores had survived in soil for this extended period. Alpine strawberries, highly susceptible to all races of Pff, were grown from true seed and planted as a bait crop on a 0♵ m-spaced grid. fragariae (Pff) and used for strawberry red core fungicide and cultivar resistance trials until 1981 was surveyed for the presence of inoculum of the pathogen 11 and 12 years later. An experimental field infested with Phytophthora fragariae var.
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