Contamination of healthy seed tubers byPolyscytalum pustulans andPhoma exigua var.foveata in potato stores

  title={Contamination of healthy seed tubers byPolyscytalum pustulans andPhoma exigua var.foveata in potato stores},
  author={S. F. Carnegie and Ann M. Cameron},
  journal={Potato Research},
SummaryBetween 1976 and 1981, healthy seed tubers were kept in five stores used for holding virustested stem cutting stocks. The incidence ofPolyscytalum pustulans (skin spot) andPhoma exigua var.foveata (gangrene) was assessed after four months storage. The tubers were planted, often after various treatments, and the incidence of the pathogens on their progeny tubers assessed after harvesting and further storage.Seed tuber contamination byP. pustulans varied with the store and the differences… 
Influence of seed tuber infestation, chemical seed treatment, and pre-harvest climate on incidence of gangrene and dry rot of potato (Solanum tuberosum L.)
The site of cultivation markedly influenced mean levels of P. foveata infestation, which were found to be related to temperature and rainfall during a 40 day pre-harvest period at the trail sites; however,mean levels ofF.
Resistance to thiabendazole in isolates of Polyscytalum pustulans (skin spot) and Fusarium solani var. coeruleum (dry rot) in Scotland
Between 1988 and 1991, isolates of Polyscytalum pustulans were obtained from potato tubers grown in Scotland and tested for sensitivity to thiabendazole (TBZ) on agar, finding resistant isolates were present on all classes of seed potatoes.


Contamination byPolyscytalum pustulans andPhoma exigua var.foveata of seed stocks derived from stem cuttings in Scotland
While there was variation between farms in the amount of tuber contamination of VTSC stocks, contamination was reduced considerably by an annual post harvest fungicide treatment and the incidence of P. pustulans was largely unaffected by the geographical location of the farms.
Effects of treating seed potatoes from commercial and stem cutting stocks with benomyl, thiabendazole and 2-aminobutane on yield and disease.
2-aminobutane prevented skin spot and gangrene developing on treated tubers after lifting or treated with benomyl or thiabendazole in January and decreased silver scurf on the produce of commercial seed at Rothamsted but gangrene was not consistently affected by seed treatments.
Persistence of Phoma exigua xar. foveata and Polyscytalum pustulans in dry soils from potato stores in relation to reinfection of stocks derived from stem cuttings
The gangrene potential of the progeny tubers was much greater than that from untreated tubers or from tubers treated with an uncontaminated soil, and the role of inoculum surviving in dry soil is discussed in relation to reinfection of VTSC stocks.
The influence of potato harvesting and grading machinery on contact spread of Phoma exigua var. foveata on tubers
SUMMARY The incidence of wounds infected by Phoma exigua var. foveata was increased if freshly damaged tubers (recipients) were shaken in a bag with diseased tubers (donors) to simulate the
Aerial dispersal of the potato gangrene pathogen, Phoma exigua var. foveata
A semi-selective medium for isolating the potato gangrene pathogen, Phoma exigua var.
Seasonal occurrence of the potato gangrene pathogen, Phoma exigua var. foveata, in the open air
Sampling simultaneously up wind and down wind of potato fields in September and October demonstrated that the potato crop was the main source of airborne propagules caught down wind but small numbers of P. exigua var.
Summary of results of experiments on the control of the potato tuber fungal diseases gangrene, dry rot and skin spot with various chemical substances, 1966–80
There are several active fungicides whose use can be adapted to the particular needs and storage facilities of farmers and merchants, and where fungicides did not control pathogens, failure was traced to too low a residue or poor distribution of the chemical over the tuber surface, suggesting faulty treatment or unsatisfactory methods of application.