 |
Leaf blight causing fungal disease occurring in the cool region. Black sooty molds are produced in the back side of the leaf. These are like black, irregular shaped, small lesions bristly in the leaf. The infected leaf keeps green at first but gradually turns to yellow. It occurs in other clovers. |
 |
The representative fungal disease causing plant death in the warm region. The hyphae like white cotton twine bristly around the base of the stalk and crown as the temperature goes up after the end of the rainy season. The infected tissues gradually brown, collapse, and then the entire upper-ground part withers. The hyphae become like the bunch on withering leaf and stalk, and then becomes yellowish brown sclerotia. They overwinter in the soil and become the disease spreader of next year. The thatch of the infected tissue, sclerotia and the fragment of hyphae disperse and transmit by wind and rain. The causal organism is more polyxeny than Sclerotinia crown and stem rot fungi. |
 |
Spot-causing fungal disease occurring in the leaf. The lesions are at first white, oval ones and turn to drab back, and fuse with other lesions to become irregular ones. The border part gradually becomes dark brown and the lesion becomes clear. The small black grains (pycnidia) are formed on the surface of the lesion. The causal organism invades only white clover and does not infect other clovers. |
 |
Fungal disease which produces spots in the leaf. It occurs mainly in the rainy season and autumn. The lesions are at first small and drab to brown ones. Then they expand gradually and become brown to dark brown lesions of about 5-10mm in diameter with characteristic zonations. The lesions are often fainter and with unclearer zonation in white clover than in red clover. The species of the causal organisms of Stemphylium leaf spot are different in red clover and white clover. The white clover fungi does not invade red clover. |
 |
Rust disease occurring in the stalk and leaf. Only the telia are formed on white clover. Telia are mainly produced the backside of the stalk and leaf, dark brown, oval and upheave considerably. The leaf withers rolling up when occurring severely. |
 |
Spot-causing fungal disease mainly occurring in the leaf and stalk. The lesions are grayish brown devided by leaf veins, fuse mutually and cause leaf blight. They become purple brown stripes when occurring in the stalk and the damage enlarges. The causal organism can infect other kinds of clovers, but the pathogenicity is considered to be differentiated. |
 |
Return to top
