«'^0 RErOKT OF THE HoKTICULTURTST. 



In nearly every test this table shows very small percentages of 

 niildew. With the winter treatment the ammoniacal solution of 

 copper carbonate gave the best results, 1.4 per ct. of mildewed 

 fniit Avhere the check row had 16.5 per ct. The other Avinter 

 treatments ranged from 2 per ct. to 4 per ct. The row which 

 received the winter treatment only, 1 oz. copper sulphate to 



I gal. water, had 9.3 per ct. of mildewed fruit. This was 7.2 

 per ct. less mildewed fruit than its untreated row yielded, but 

 was considerably higher than the percentages of the other check 

 rows. 



The percentages of the tests in the first three series are particu- 

 larly low, varying from .9 per ct. to 3.5 per ct. and the checks 

 from 3.4 per ct. to 7.8 per ct. The very best was soda-Bordeaux 

 in Series II, .9 per ct., the next lowest was ammoniacal solution 

 of copper carbonate in Series II with 1.2 per ct. The tests with 

 potassium sulphide gave the highest percentages in Series I and 



II and second highest in Series III. The results with strong am- 

 moniacal solution of copper carbonate were very favorable, being 

 from 1.3 per ct. to 1.8 per ct. 



In the results for this one year there was no gain derived from 

 the winter treatment. The soda-Bordeaux and copper carbonate 

 solutions gave slightly better results than potassium sulphide did, 

 but these differences are not great enough to be of any significance. 



KECOMMEI^DATIOK 



In Bulletin 133 potassium sulphide, 1 oz, to 2 or 3 gals, water, 

 was recommended as the best remedy. The results of three years 

 show that it is still the best fungicide the Station has thoroughly 

 tested. Spraying should be begun very early just as the buds 

 are breaking and continued at intervals of about ten days. 



Further testing will be necessary to determine the relative 

 merits of soda-Bordeaux mixture and the copper carbonate solu- 

 tions in comparison with potassium sulphide solutions for check- 

 ing gooseberry mildew. 



