139 



;").■{% of llic 30 lioUls with an Jivonisie iiiciik'iico of ti.lWc. Ono fiold in Mad- 

 ison County sliowed 35% seal). Tliis field was in corn in 1918. 



Leaf rust caused by Puccinia simplex was found in six out of the .'iO fields 

 with an average incidence of 1.2% and a maximum of 20%. Stem rust 

 caused by Pnccinia graminis was found in 18 fields with an average inci- 

 dence of 2.1% and a maximum of 20%. Neitlier of these diseases wiis of 

 any considerable economic importance. 



Covered smut caused l)y J'stilano hordvi was found in 10 of the '.'Ai fields 

 with an average incidence of less than 1/.% and a maximum of 8%. Loose 

 smut due to r.s7;7r/r/o niida was found in 30 or 83% of tlie fields with an 

 average incidence of l.()% and a maximum of 25%. None of the '.)(> iiehls 

 examined had been planted with treated grain. 



Bean. 



The garden crop suffered severely from drouth injury, which was evi- 

 denced by a downward curling and extreme distortion of the leaves ac- 

 companied by marginal browning. Bacterial blight caused by Pseudomonas 

 phascoli was generally present in all gardens and constituted a serious loss- 

 producing factor. Late in the season, the mosaic disease became very prev- 

 alent. Its symptoms may have been masked by the universal drouth injury 

 earlier in the season. The leaf spot caused by Phj/Uosticta phaseoHna was 

 found at Lafayette. 



Bp:et. 



The sugar beet crop of Lake County seemed to be more or less free from 

 di.sease except for some leaf-spot caused by Cercospora beticola. A little 

 scab due to Actinomyces scaMes was found, and crown gall was reported 

 by growers. A crown rot of the roots was noted in DeKalb (bounty. 



Garden beets throughout the state were generally infected with the leaf- 

 .spot due to Cercospora hciicohi, but as a rule the attack was not particularly 

 severe. 



Blackberry. 



(>raiigt' rust due to (linniiDconid pcch-ia>i(i was very widespread and abini- 

 (lant throughout the state in late May and early June. 



Bluegrass. 



Tile slime mold. Phu-suruni (■incrcum, cau.sed conspicuous patches in lawns 

 early in the spring. 



CAIinAOE. 



The limiting factor in tlie cabbage cro]) of Indiaii.-i tliis season was the 

 yellows disease caused l»y Fusariutti coiif/lutiiKins. The extremely hot 

 weather was especially favorable to this di.sease and it was widespread 

 tliroughout the state both in small gardens and in truck fields. In certain 

 of the market gardens near Indianapolis, the early crops of Wakefield and 



