Bean common mosaic is a viral disease caused by several different virus strains. A close cousin to bean yellow mosaic and clover yellow vein virus, bean plants can be unfortunate enough to be infected with all three simultaneously.
What’s fascinating about this disease is that two different sets of symptoms may occur.
Symptoms of bean common mosaic
Bean plants infected with these viruses may come down with bean common mosaic or bean common mosaic necrosis:
In both cases, leaves may be smaller, and blossoms and pods may be deformed. The symptoms your plants will exhibit depend on the virus involved, whether or not your plants have dominant or recessive genes, or if a particular gene is present. Symptoms of bean common mosaic are most likely to appear when temperatures are between 68 and 77°F.
Bean common mosaic transmission
The bean common mosaic virus overwinters in infected seeds and weeds. It is most often transmitted by aphids or spread on infected pollen. It can also move from plant to plant on clothing, tools, and vegetative material.
Resistant bean varieties
These bean varieties are resistant to one or more strains of this virus:
Once these viruses are in your soil, it is hard to get rid of them. It is far better to start with clean seeds and do what you can about those pesky aphids.
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