Symptoms: yellow green and dark green flowers and leaves appear on the infected leaves. The leaves become smaller and the whole plant looks a little atrophic.
Pathogen: the pathogen of mosaic, which may be a cucumber mosaic virus.
Control method: remove the diseased leaves manually, burn the diseased leaves in time to prevent the re infection of the pathogen.
Symptoms: the infected leaves form annular flower leaves or necrotic bad spots.
Pathogen: broad bean wilt virus, belonging to broad bean wilt virus, also known as Eclipta ringspot virus. RNA virus, virus particle sphere, diameter 26nm.
One kind of aphid is the vector of ringspot, such as peach aphid, bean aphid, etc. However, the nature of aphid vector is not persistent.
Control method: timely control aphid. The commonly used insecticides are 1000 times of 50% malathion emulsifiable concentrate, 1000-1500 times of 40% dimethoate emulsifiable concentrate, 2000-3000 times of compound emulsifiable concentrate (dichlorvos 40%, Omethoate 10%), or 3000 times of 20% fenvalerate emulsifiable concentrate.
