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United States Department of Agriculture

Agricultural Research Service

Title: A New Isolate of Ramularia Crupinae for Biological Control of Common Crupina

item Eskandari, Farivar
item Bruckart, William

Submitted to: American Phytopathological Society Potomac Division Meeting
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 2003
Publication Date: June 1, 2004
Citation: Eskandari, F., Bruckart, W.L. 2004. A new isolate of ramularia crupinae for biological control of common crupina. American Phytopathological Society Potomac Division Meeting. 94:S142.

Technical Abstract: A French isolate of R. crupinae, which causes significant stem and foliage necrosis on common crupina (Crupina vulgaris), has been under evaluation for biological control. Recently, we found a new, pink isolate of R. crupinae that produces abundant conidia on both solid and liquid media. Spore yields are very high (2 x 10**7 spores/ml), compared with approximately 2 x 10**3 spores/ml for the original isolate. One of 11 species in the Asteraceae, Carthamus tinctorius (safflower), was infected with the new isolate of R. crupinae, developing a limited number of small, necrotic lesions on older leaves. Damage to safflower and crupina was measured after repeated inoculations with R. crupinae. Root dry weight of crupina was reduced by 53.1% and there were no significant differences (p = 0.05) in root dry weights of inoculated safflower compared with controls. Similar results were noted for data on height, number of flowers, and top dry weight.

Last Modified: 4/22/2015
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