Indiana Plant Diseases, 1922 205 



the fall on Kentucky Wonder pole beans in market gardens where over- 

 head irrigation was practiced. The foliage was destroyed and plants 

 were killed outright. Abundant and conspicuous pod lesions occurred. 



Lima Bean. — Blight due to Bacterium phaseoli was rather serious. 

 A Sclerotinia stem rot was noted. 



Beet. — Leaf-spot, due to Cercospora beticola, was serious in garden 

 and sugar beets. The peculiar mosaic-like disease noted in 1921 was 

 severe in sugar beets. 



Blackberry. — Rust (Kunkelia nitens) occurred on wild and culti- 

 vated plants in southern Indiana. 



Cabbage. — Yellows, caused by Fusarium conglutinans, was especially 

 destructive because of the hot dry weather. The disease was reported 

 from 31 counties. The use of resistant types is becoming general. In 

 the spring black-leg, caused by Phonia lingam, was found serious locally 

 by Gregory, who also noted black rot, due to Pseudanionas campestris, 

 in a few localities. A Sclerotinia stem-rot was noted in Lake County. 



Cantaloupe. — Bacterial wilt caused by Bacillus tracheiphilus was as 

 usual the most serious disease. Anthracnose {Colletotrichum lagenari- 

 uni) fruit lesions were found on the Tip-top variety in October. Leaf 

 blight caused by Altemaria brassicae nigrescens was very serious, caus- 

 ing premature death of the leaves and poor flavor in the fruit. Mosaic 

 was worse than usual, stunting the plants and preventing proper ma- 

 turity of the fruit. Milkweed, a mosaic carrier, was found commonly 

 in diseased fields. 



Carrot. — Leaf-spot, caused by Cercospora apii carotae, was noted 

 in market gardens. 



Cauliflower. — Stem rot, due to Sclerotinia libertiana, was noted in 

 May, killing scattered plants. 



Celery. — The high temperature of this summer favored the Fusari- 

 um yellows disease which is fatal to the Golden Self-blanching variety 

 and is widespread in market gardens. Early blight caused by Cercos- 

 pora apii remained the most prevalent celery disease. A few cases of 

 mosaic were noted. 



Cherry. — The limiting factor in cherry growing is the leaf-spot, due 

 to Coccomyces hievialis, which causes serious defoliation and devitaliza- 

 tion of the trees. Burkholder reports it worse than usual this year and 

 complaints were received from growers in eleven counties during June 

 and July. Brown rot {Sclerotinia cinerea) was worse than usual owing 

 to the warm weather. Powdery mildew was noted. 



Clover. — In common with the rest of the country, all Indiana clover 

 fields became conspicuously whitened with an unprecedented epidemic 

 of powdery mildew (Erysiphe polygoni) . The attack lasted all season 

 and occasioned innumerable inquiries, mostly concerning the possible 

 injuriousness of the mildewed clover as feed for live-stock. Mains (12) 

 found that the mildew was restricted to red clover and that American 

 varieties were more susceptible than European varieties. Mosaic oc- 

 curred very generally on red clover. Mains noted rust (Uromyces tri- 

 folii) rather sparingly. 



