Indiana Plant Diseases. 201 



exi>erimeutal field at Lafayelte lUantcd with Indiana .^^lowii IJiiral New 

 Yorker seed. Gregory reports a o7 per coiit loss in yield in a liold of Early 

 Ohio potatoes in Dekalb connty dne to mosaic and a 100 por cent infesta- 

 tion of mosaic in a field of the Bliss Triiunpli variety in Floyd county. 



The potato situation in the vicinity of Hammond presents a serious 

 problem. In past years hii,'h yields wei-e olitaiiied hut now 40 to GO bushels 

 per acre is representative. The plants are distinctly stunted, the leaves 

 curled and wrinkled and the yield reduced to one or two small tubers. 

 Imported seed, especially from the Wanatah region, is considered far more 

 desirable than home .grown seed. Typical mosaic symptoms are not 

 present but it is suspected that the trouble is due to this disease. 



Considerable difficulty was experienced this year as a result of rotting 

 of the seed pieces in the soil before the si)routs were up. This cau.sed the 

 occurrence of many blank spaces in the fields. 



Fire blight caused by Bacillus omylovonis was reported from several 

 ocalities. 



Black-root was noted in cold frames near Indianapolis June 4. Duwnj 

 mildew {Peronospora parasitica) and white rust (Cystop'm camUMs) 

 were found on plants going to seed July 17. Marked hypertrophy of the 

 floral parts was caused and lesions caused by both fungi wore present on 

 the seed pods. 



KASPBERBY. 



Anthracnose caused by PlectoiUsceUa veneta is undoubtedly the limiting 

 factor in raspberry culture in many sections of the state and was especially 

 severe this year. Burkholder reports the disease present in the following 

 counties : Lake, Laporte. Lagrange, Steuben. Cass. Miami, Wabash, Foun- 

 tain, Bartholomew. Greene. Knox. Vanderburg, Warrick. Lawrence. Orange, 

 Washington. Floyd and Jefferson. Specimens were received from Whitley 

 and Madison counties and it was also found in Morgan and Marshall coun- 

 ties. The coalescence of old lesions of the previous year a1)out the bases of 

 the bearing canes produces a girdling effect which causes the leaves to be 

 stunted and yellowish and the fruit to ripen prematurely. Affected canes 

 often die before any fruit is matured. Anthracnose lesions were noted 

 on newly planted scions and the disease is undoubtedly introduced into 

 new plantings with diseased cuttings. 



Leaf-spot due to ficptoria rubi was found in Lake county. 



KIIUBAKB. 



Leaf-spot due to Ascochyta rhci was prc^sent in practically all plantings 

 examined. 



