1922.] rrBLIC DOCUMENT — Xo. 31. 2'Aa 



just past fi;reenli()use cucumbers were heavily attacked, with 

 losses rangin^ij from 25 to 60 per ceut. The use of 4-6-50 

 Bordeaux mixture ai)pears to be profitable, even thoufjh any- 

 thing approaching j)erfect control seems at present unattainable. 



Project 6. "Investigation of onion diseases." 



Professor OsMUX and Professor Anderson. 



Work under this project has to date been focussed on onion 

 smut, the most destructive disease of onions in this State. A 

 technical paper, entitled ''Development and Pathogenesis of 

 the Onion Smut Fungus," is now in press, to be published as a 

 station bulletin. Very striking results have been obtained 

 through formaldehyde treatment of infected soils. The chief 

 difficulty in the application of this method appears to be 

 mechanical limitations in machinery used for distribution of the 

 formaldehyde. 



Project 9. "Investigation of carrot blight." 



Assistant Professor Krout. 



The causal organism of this disease has been isolated and 

 studied under culture, work has been done on seed disinfection, 

 and field plots have been sprayed. The work, however, has 

 not progressed far enough to warrant definite conclusions. 



Project 10. "Apple disease control investigations." 



Assistant Professor Krout. 



This project was presented in February of 1921, in response 

 to an urgent appeal of apple growers in the eastern part of the 

 State for help in controlling apple scab and black rot. Through 

 the co-operation of the Xashoba Fruit Producers' Association 

 and several of the county farm bureaus, transportation facili- 

 ties, spraying equipment, labor and orchard space were allowed 

 the station for carrying on this work. The value of the 

 season's results was somewhat reduced by late spring frosts 

 which killed a large part of the fruit buds. Indications to date 

 are that proper spraying can control scab in eastern Massa- 

 chusetts. The best results were obtained on plots where 

 Bordeaux mixture was used for the "pink bud" spray, and 

 liquid lime-sulfur for later applications. Results from dusting 

 were inconclusive. This work should continue at least three 

 years and probably longer. 



