182 MAINE STATE COLLEGE 



APPLE SCAB. 



Pusicladium, dendriticnm, 



Plate V. 



This plate was prepared in stipple crayon after the colored plate 

 by Geo. Marx, (PL II, U. S. Agr'l Report, 1887) by Miss 

 Hannah Lord, of Orono, Me. 



Fig. 1. Apple affected by the scab. 



Fig. 2. Leaf of apple affected by the scab. 



Fig. 8. Section through a portion of a scab spot on the fruit, 

 showing the growth of the fungus ; greatly magnified. 



Fig. 4. Spores of the fungus greatly magnified ; four of them 

 germinating. 



Experiments were conducted the past season with fungicides, 

 upon the Apple Scab, in Michigan and Wisconsin by Professors 

 Taft and Goff ; under the auspices of the U. S. Dept. of Agri- 

 culture, and through the kindness of Prof. Galloway we are able 

 to record the following results : 



These gentlemen experimented with several compounds, but the 

 copper salts were so much superior to all others, that they alone 

 deserve consideration. 



They recommend spraying just as soon as the buds begin to 

 swell. In their experiments they sprayed seven times during the 

 season, making the last application about Aug. 10th. In ordi- 

 nary seasons our or five applications would be enough. They 

 recommend the following : 



Ammoniacal Carbonate of Copper Solution. 



1. Dissolve 3 ounces of carbonate of copper in 1 quart of 

 20° ammonia water and dilute to 32 gallons. 



Modified Eau Celeste. 



2. Dissolve 2 lbs. copper sulphate in hot water, and in another 

 vessel dissolve 11-2 lbs. bicarbonate of soda ; mix the two and 

 when cool, add 11-2 pints of 20° ammonia water and before using 

 dilute with wafcer to 32 gallons. 



