Tobacco mosaic virus (TMV)
www.bspp.org.uk/downloads/education/BSPP_TMV_Info.pdf
ag.umass.edu/greenhouse-floriculture/fact-sheets/diagnostic-test-kits
Rose black spot fungal infection
www.rhs.org.uk/advice/profile?PID=270
Aphid infestation
www.rhs.org.uk/advice/profile?pid=181
Nitrate deficiency
www.rhs.org.uk/Advice/Profile?PID=456
Magnesium deficiency
www.rhs.org.uk/Advice/Profile?PID=456