Plant Pathology

Pre-and-Post-Harvest Pathology

The pre-and post-harvest pathology research programme addresses a number of important industry issues. The research on incidence and distribution of fungal pathogens in young trees is highly relevant as is the integrated management of apple scab. Apple replant disease and various aspects of post-harvest pathology are also receiving attention.

Phytosanitary and Biosecurity Workgroup
Integrated Pest Management Group

Projects list

  • Determining the risk of mulches in the spread of canker pathogens in apple orchards. (L Mostert, V Jacobs and R Kallideen)
  • Investigating the relationship of pathogens, particularly Alternaria, in causing fruit spot symptoms/lenticel damage on apples. (P Louw)
  • Bacterial disease survey of major pome fruit production areas in South Africa. (Y Petersen)
  • Determine the occurrence of fungicide resistance against pyrimethanil and fludioxinol in Monolinia laxa and Botrytis cinerea populations from stone fruit orchards. (P Louw)
  • Development of a hybridisation-based detection assay for PVdI. (H Maree and R Bester)
  • Evaluation of PVdI transmission through top working infected trees. (H Maree and R Bester)
  • The influence of climatically different seasons on the reproductive strategy of Venturia inequalis and the RIMpro disease forecasting model. (A McLeod and E Froneman) [Abstract]
  • The effect of organic amendments on the severity of apple replant diseases in subsequent apple orchard replantings. (A McLeod and R Janse van Rensburg) [Abstract]
  • Evaluation of apple rootstocks tolerance against specific apple replant disease (SARD).(I Labuschagne, A McLeod, X Siboza and W Truter) [Abstract]
  • Evaluation of pruning wound protectants on nursery apple trees. (L Mostert) [Abstract]
  • Alternatives for the management of apple replant disease. (A McLeod and D de Villiers) [Abstract]
  • Determine fungicide efficacy using qPCR for detection and quantification of Botrytis cinerea inoculum and viability on pear leaves as a substrate, before and after fungicide application. [Abstract]
  • Survey of stem canker pathogens on stone fruit propagation material and young stone fruit trees. (L Mostert and V Jacobs) [Abstract]
  • Evaluating an ascospore release forecasting model and orchard disease monitoring methods for improving apple scab management. (A McLeod) [Abstract]
  • Identification of inoculum sources of oomycetes, a major contributor to apple replant disease, and the management thereof. (A McLeod, M Nyoni and S Moein) [Abstract]
  • The role of stress factors in predisposing plum trees to invasion by bacterial pathogen Pseudomonas syringae pv. syringae. (T Coutinho, K Bophela and M Modiba) [Abstract]
  • Screening apple rootstocks for tolerance to Phytophthora crown rot. (A Vermeulen) [Abstract]
  • Thermal and non-thermal treatments of stone and pome fruit: Towards efficient phytosanitary measures. (O Caleb, Z Belay and N Nyamende) – see Quality management [Abstract]
  • Bioreactor and process development for the production of antimicrobial lipopeptides pro-duced by Bacillus spp. for biological control of postharvest phytopathogens in the perishable fruit industry. (R Pott, C Kriek, J von Johan-nides and G Teke) [Abstract]
  • Pursuit of sanitiser products for potential use in the apple and pear industry. (P Louw) [Abstract]
  • Lipopeptides Fengycin and Iturin A as post-harvest fungicide on pome fruit. (C Lennox, J Meitz-Hopkins and S Magwebu) [Abstract]
  • Develop a storage protocol for plums harvested from week 5 onwards for 6 weeks in bins - decay control using alternative gas regimes of CO2 and O2 manipulation, UV treatment of air supply and a GRAS product drench. (P Louw)  [Abstract]
  • Purification of antimicrobial lipopeptides produced by Bacillus spp. for biological control of postharvest phytopathogens in the perishable fruit industry. (R Pott, J von Johan-nides and G Teke) [Abstract]
  • The development of an integrated management strategy for Bulls Eye rot of apples. (C Lennox, J Meitz-Hopkins and A Russouw)  [Abstract]