1. A. Munir:
Crop Diseases Research Programme, Institute of Plant and Environmental Protection, NARC, PARC, Islamabad, Pakistan
2. M. S. Phillips:
Crop Diseases Research Programme, Institute of Plant and Environmental Protection, NARC, PARC, Islamabad, Pakistan
3. D. Trudgill:
Scottish Crop Research Institute, Invergowire, Dundee, UK