​​​The Disease Management Unit provides the following general strategies for management of tropical and subtropical crop diseases:

  • Exclude the pathogen - prevent inoculum from coming into an area where the pathogen does not occur (e.g. quarantines, inspections, certifications).

  • Eradicate the pathogen - remove or reduce inoculum (e.g. rotation, sanitation, eliminating alternate hosts, heat treatment, some pesticides).

  • Protect the healthy plant against infection  - provide a "barrier" (chemical, biological or physical) between the host plant and pathogen.

  • Genetic resistance of the plant against the pathogen  - grow a less susceptible host plant.

  • Avoidance - avoid development of a disease on a plant(s) even though it does occur in the area.

In addition the unit, provides an essential service to the national Citrus Improvement Programme (CIP) by elimi-nating viruses from citrus mother stock. In addition, this division perfected the technique of pre-immunising all citrus released to nurseries against citrus tristeza virus (CTV) by means of mild strain inoculation.

For enquiries regarding the current research activities of the
Disease Management unit, contact Dr Mbulelo Ncango.      


PUBLICATIONS LIST

CONFERENCE LIST

 

Contact: Ncangom@arc.agric.za or Maritha@arc.agric.za

Postal address:  ARC-ITSC, Private Bag X 11208, Mbombela, South Africa, 1200

Physical address:  ARC-ITSC, Disease Management Unit, 3 Rivier Street ,
Mbombela, South Africa, 1201

Current research projects


Researchers of the Disease Management unit are currently involved in the following research projects:

  • Citrus Improvement Program. Principal Investigator: Dr MD Ncango, ARC-ITSC; Co-investigator: Dr B Manicom, ARC-ITSC; Ms Z Dlamini, ARC-ITSC; NB Zulu, ARC-ITSC; Dr F Van Vuuren, Citrus Research International (CRI).
  • Avocado Sunblotch Viroid Disease Indexing. Principal Investigator: Dr MD Ncango, ARC-ITSC; Co-investigator: Dr B Manicom, ARC-ITSC; Ms Z Dlamini, ARC-ITSC; NB Zulu, ARC-ITSC.
  • Alternative antifungals against Citrus Black Spot. Principal Investigator: Dr N Malebo, Central University of Technology (CUT); Co-investigator: Ms J. Nkhebenyane, CUT; Mr T Magunga, CUT; Dr MD Ncango, ARC-ITSC; Dr N Mathaba, ARC-ITSC.
  • Seasonal dynamics, inoculum availability and timing of infection and control of mango blossom malformation. Principal Investigator: Schoeman MH, ARC-ITSC; Co-investigator: Botha FA, ARC-ITSC; Melissa Grobler, QMS; Prof. T.Regnier, Tswane University Of Technology (TUT); Zulu NB, ARC-ITSC; Moriri TM, ARC-ITSC.
  • Guava wilt disease – screening for resistance. Principal Investigator: Schoeman MH, ARC-ITSC; Co-investigator: Botha FA, ARC-ITSC; Prof. N. Labuschagne University of Pretoria (UP); Zulu NB, ARC-ITSC; Moriri TM, ARC-ITSC; Anne-Helene Meyer; Du Roi.
  • Disease Diagnostics. Principal Investigator: Schoeman MH, ARC-ITSC; Co-investigator: Zulu NB, ARC-ITSC; Moriri TM, ARC-ITSC.
  • Epidemiology and management strategies of Sunblotch Viroid. Principal Investigator: Dr MD Ncango (ARC-ITSC); Co-principal investigator: Zanele Zwane (UKZN and ARC-ITSC); Dr A Gubba (UKZN); Dr G Tlou (UJ).
  • Phytophthora cinnamomi, a comminatory disease of macadamia in South Africa. Principal Investigator: Dr MD Ncango (ARC-ITSC); Co-principal investigator: Nontokozo Kunene (UKZN and ARC-ITSC); Dr A Gubba (UKZN); Dr G Tlou (UJ); M Schoeman (ARC-ITSC); C Barry (Subtrop).