New York AoRioTTT/rniiAL Experiment Station. 211 



An examination of this table shows that in the case of Italian 

 Frunes the best results came from the three treatments given in 

 Series 3, namely May 25, June 17 and July 14. The experiments 

 of 1895 showed that when no more than three sprayings are given 

 during the season it is not best to begin before the trees blossom 

 but rather make the first spraying after the blossoms fall. The 

 experiments of 1896 indicate that it is better to put off the first 

 treatment till the last week of May, or till about ten days after 

 the blossoms fall. 



The attempts to control the disease with two treatments which 

 were tried in 1895 and 1896 show that when the disease is no 

 worse than it was in those years it may be practically controlled 

 by. two treatments; but it is hardly safe to recommend this plan 

 unqualifiedly till it has stood the test of a season when the 

 attacks of the leaf spot fungus are unsually severe. 



In view of the results of the investigations of 1895-6, the follow- 

 ing line of treatment is confidently recommended, instead of that 

 which was suggested on page 14 of Bulletin 98. 



Course of treatment recommended for plum leaf spot. — When but 

 two treatments are to be made during the season, let the first 

 be given about ten days after the blossoms fall — that is, usually 

 about May 25. It should not be made later than June 1. Make 

 the second treatment about three weeks after the first. Better 

 results may be expected from three treatments and three treat- 

 ments are especially recommended in seasons when the disease 

 is very abundant. Make them as follows: 



First. About ten days after the blossoms fall. 



Second. Abont three weeks after the first. 



Third. From three to four weeks after the second. 



YIELD OF FRUIT INCREASED BY SPRAYING FOR THE 



PLUM LEAF SPOT. 



Aside from the results bearing directly on the questions under 

 investigation in 1895 and 1896 the experiments in treating plums 

 for the leaf spot brought out some very important and definite in- 

 formation as to the influence of such treatment on the yield of 



