141 



•iinlod as cnlls liccausc „( .Ircp ciacks and liccaiisc uf a rot icsiilliiiu Irm 

 •■(■al)-lik(' lesions on the side oC tlic iticlnn that was in <nnlact wilii lli 

 ^(lii in tiic ticld. 



Cakkot. 



T.oaf spof caused liy ('<rcii!<iii>r<i ti/iii var. tindliic was fdinid in I lie In<li 

 inaiK)lis market t^ai'dens. 



("a lAI.rA. 

 I.oaf-spot due (o Mticni.<(ii(niiiin idlnlinn was widesjn-ead. 



Tlie most serious disease of celery as observed near I.afayette and Indi- 

 anapolis was the root trouble known as the "stuiitiiis disease"'"-, "crown 

 rot." or ■■yellows". This Is caused by a soil fungus. B"\isarium, and is essen- 

 tially similar in its effects to the cabbage yellows disease. Affected plants 

 show a yellow color or premature bleaching of the older leaves usually on 

 one side, exhibit all degrees of stunting, and may die early in the season or 

 continue a sickly existence. The fungus persists in the soil and the dis- 

 eased areas enlarge year by year. The disease is confined chiefly to the 

 highly desirable (Jolden Self-blanching v.ariety and green or late varieties 

 are i)ractically immune. In 1J)14 this dise.ise Wiis so prevalent in the celery 

 marshes at Kalamazoo. Michigan, and (Joshen. Indiana, that the industry 

 was threatened with failure. Steam soil sterilization was found to be effect- 

 ive but rather impracticable, and the situation was relieved by the dis- 

 covery that the Easy Bleaching variety, though slightly less desirable com- 

 mercially, was highly resistant to the disease. This variety has now com- 

 ])letely supplanted the Golden Self-bleaching variety at Kalamazoo and 

 (Joshen. At present the disease is just gaining a f(>othold in the Indianaix)lis 

 market gardens. This season it caused one grower to plow under his celery, 

 and caused a itractical failure for another. A small area was found in a 

 third field, and in another case two diseased plants were found in the cold 

 frames early in the season and a few scattered plants in the field later. In 

 this disease, as in cabbage yellows, dissenunation is largely i»y means of 

 diseased transplants. 



In the Goshen crop, early liliglit caused liy ('< rcos/xird tifH \vas very d(- 

 structive as observed in early September. Late liliglit due to Sc/itoriii 

 ItrtroHcliiii occurred in a garden in Rush County in Septemi»er. The bac- 

 terial leaf-spot was found near Lafayette. August 11th.. and in some of 

 the Indianapolis market gardens. August L'Und. Some nematode injury 

 was found at Goshen where there is a large area of muck soil so badly in- 



C.ioiis. (J. H. ' Tho Michigan plant disease survey li.r l".tl4. Mieh. Acad. Sei. 

 17th. Ann. Kpt. :126-127. 191.J. 



-Conns, (;. U. .^^iehi^;an plant disease survey for 1K17. Mieh. Acad. Sci. 2Uth. 

 Anil. Kpt. :444. 1918. 



