​​​The Disease Management unit provides the following general strategies for management of tropical and subtropical crops 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.       

 

                   

 ​MEET THE STAFF 

​ Scientific  

​Dr Mbulelo Ncango
Tel:  013 753-7009 | Fax: 013 752-3854
Fax2mail: 086 503 6247
Email: Ncangom@arc.agric.za

Research focus:

Graft transmissible disease of Citrus and Avocado Sunblotch Viroid disease indexing. 



Maritha Schoeman
Tel:  013 753-7115
Fax: 013 752-3854
Email: Maritha@arc.agric.za

Research focus: 

Epidemiology and control of Tropical and Subtropical diseases. Screening for resistance cultivars.

Support


Thomas Moriri
Tel: 013 753-7025
Fax: 013 752-3854



Thabile Sifundza
Tel: 013 753-7025
Fax: 013 752-3854

Technical

Zamangwane Dlamini 
Tel: 013 753-7124
Fax: 013 752-3854
Email: Zama@arc.agric.za



André Botha 
Tel:  013 753-7141
Fax: 013 752-3854
Email: AndreB@arc.agric.za



Ncobile Zulu
Tel: 013 753-7125
Fax: 013 752-3854
Email: ZuluN@arc.agric.za

 

​Professional Development

Program (PDP) students

 

Zanele Zwane
Tel: 013 753-7114
Fax: 013 752-3854
Email: ZwaneZ@arc.agric.za

Research project:

Epidemiology and management strategies of Avocado Sunblotch Viroid Disease



Nontokonzo Kunene
Tel: 013 753-7114
Fax: 013 752-3854
Email: KuneneN@arc.agric.za

Research project:
Phytophthora cinnamomi, a comminatory disease of macadamia in South Africa

 

 PUBLICATIONS LIST

CONFERENCE LIST

 

 Disease Diagnostics

​Visual diagnosis

​No charge

Visual diagnoses

​No charge

Yeast Isolation and identification to genus level

​R196.49 per sample excluding VAT

Analysis for Phytophthora 
and Pythium

​R196.49 per sample excluding VAT


Diagnostic services

            TYPE  OF  SERVICE  COST
Shoot Tip Grafting​R15 000.00 per cultivar exclusive VAT
Virus analysis with PCR: Citrus Tristeza Virus, Citrus Psorosis Virus and Apple Stem Grooving virus​R300.00 per sample excluding VAT
​Viroid analysis with PCR: Citrus Viroids I, II, III, IV, V and Citrus Exocortis viroid​R300.00 per sample excluding VAT
​Citrus greening with PCR​R300.00 per sample excluding VAT
Biological indexing​R5000.00 per cultivar excluding VAT
ASBVd indexing​R110.00 per sample excluding VAT

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).

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