New York Agricultural Experiment Station, 387 



it do so it would probably be best to apply eau celeste mixture, 

 because it would be less apt to spot the fruit than would the 

 Bordeaux mixture. This is suggested for trial but not positively 

 recommended, as we have not yet had an opportunity to compare 

 the two mixtures for August treatment. 



Remember that thorough spraying is essential to\ success. This 

 has been advocated over and over again in former bulletins and 

 reports of this Station, and yet probably nine-tenths of the read- 

 ers who have undertaken to spray their orchards fail to secure 

 the best results because the work is not done thoroughly. It is 

 not necessary to drench the trees, but the aim should be to com- 

 pletely cover every leaf with fine mist-like particles of the spray. 

 To do this it is necessary to have a powerful pump and good 

 nozzles. For a more complete discussion of spraying apparatus 

 and methods of spraying, the reader is referred to Bulletin 74 or 

 the 1894 annual report of this Station. 



A remarkable instance of the practical benefits of protecting 

 the foliage of bearing plum trees from the attacks of fungous 

 diseases is seen in the case of the Italian Prune trees which were 

 treated in 1896, as explained on subsequent pages. In this In- 

 stance the treatment resulted in an average increase per tree of 

 twenty-four and one-half pounds of marketable fruit at an esti- 

 mated cost of less than one cent per pound. 



Bordeaux Mixture as a Preventive of Black Knot and 



Fruit Rot. 



The treatment of plum trees with Bordeaux mixture for leaf- 

 spot appeared in Dr. Thaxter's experiments to check the plum 

 black knot, as it did also in a later experiment by Lodeman.* 



In treating peaches for the fungus which causes the ripe rot of 

 the fruit and the blight of the blossoms, Chesterf has found that 

 four sprayings with Bordeaux mixture, 1 to 7^ formula, reduced 

 the rot to about one-third of what it was on unsprayed trees. He 

 found that With two sprayings there was about twice as much 



* Lodeman, E. G. Spraying for bl»ck-kiiot upon cherries and plums. Garden and Forest, 7 

 508. 

 i; St or. F. D. Bnll. Del. .Station 29; 11. 



