Rose_Fig07.jpg just found this on the 'net, there is a heap of threads on it.
an extract from rosecare.com "Damage from the popular non-selective herbicide glyphosate (Roundup) is commonly mistaken for disease or insect damage on roses. Be aware that damage from Roundup can occur the following season if fall applications are made near your roses and accidentally drifted on the susceptible green stems."
http://www.apsnet.org/publications/a...ges/Roses.aspx