![]() ![]() With potato ring necrosis, tobacco mosaic and tobacco necrosis viruses, there seems to be a fixed ratio between the amount of virus and the amount of tannin needed to decrease infectivity by a fixed proportion. Raspberry tannin and tannic acid combine irreversibly with some viruses but with others the combination is readily reversed by dilution or increase in pH value. The degree to which virus infection is inhibited by tanning substances from raspberry or other sources depends on the virus and not on the species of test plant. Extracts from peach or apple leaves contain less of such substances than do those from leaves of plum, cherry, raspberry or strawberry. It is lost on dialysis, precipitated by nicotine or added protein, unaffected by boiling or freezing, and is probably a phenolic tanning agent. Increasing the temperature to 24☌ (75☏) reduces the risk of mosaic virus.SUMMARY: Raspberry leaves contain a substance which prevents the infection of plants by viruses when it is mixed with the inoculum. If growing in a greenhouse replace the top soil. If you prefer not to take the risk uproot infected plants and burn.ĭo not plant at-risk varieties in areas previously infected the following season. ![]() Do not leave any signs of infected leaves on the soil. If you choose to keep your infected plant(s) ensure you wash your hands after handling one to reduce the risk of contamination. Mosaic virus is transmitted by insects and humans alike. Plants with mosaic virus can survive, but will suffer a reduced crop. Different varieties of mosaic virus have different symptoms, but all cause similarly yellowed leaves. Leaves are mottled with yellow areas and become distorted.
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