Reference Report for IND83072185
| Title: | Bacterial tan spot a new foliar disease of soybeans glycine-max |
| Authors: | Dunleavy, J.M. |
| Source: | Crop Sci. 1983, 23(3):473-476 |
| Abstract: | A new soybean [G. max (L.) Merr.] disease that causes large tan necrotic spots on soybean leaves was 1st observed in Iowa [USA] in 1975. Necrotic areas usually fell to the ground during high winds, giving a ragged appearance to leaves. The disease was confined to leaves and was never observed on stems or pods; wilting did not occur. The causal bacterium was gram positive, motile, formed a medium-yellow endopigment, grew well at 37.degree. C, hydrolyzed esculin, did not produce urease, and was pathogenic to soybeans and beans (Phaseolus vulgaris L.). The bacterium was identified as Corynebacterium flaccumfaciens (Hedges) Dowson, and the name bacterial tan spot was proposed for this disease (which had been observed in 16 counties in Iowa through 1981). One isolate of C. flaccumfaciens from soybeans, 2 isolates from beans, and 1 isolate each of C. flaccumfaciens ssp. aurantiacum Schuster and Christiansen and C. flaccumfaciens ssp. violaceum Schuster, Vidaver and Mandel from beans were used to inoculate leaves of soybeans and beans. All isolates caused a leaf spot and wilt of beans, but only the soybean isolate caused a leafspot on soybeans. Of 20 northern-grown soybean cultivars tested, 3 were resistant to the disease, 7 were slightly susceptible, 3 were susceptible and 7 were very susceptible. Of 20 southern-grown cultivars, 8 were resistant, and 12 were slightly susceptible. |
SoyBase
Follow us on Twitter @SoyBaseDatabase
