1907.] PUBLIC DOCUMENT — No. 33. 1(;7 



and sulfur treatment has been api^lied to peach trees for the 

 San Jose scale not the slightest trace of this sj)otting can be 

 found, showing that this mixture has a very repressive in- 

 fluence upon the fungus. 



The Lime and Sulfur Mixture as a Fungicide. 



The increased activity of the San Jose scale during the past 

 two years has resulted in more attention being paid to the 

 spraying of orchards. This has been the means of reducing 

 very j)erceptibly many of the troubles to which orchards are 

 subject. Our examinations of a number of orchards during 

 the past summer which had been sprayed with the lime and 

 sulfur mixture have convinced us that this mixture is one 

 of the most reliable fungicides known for the suppression of 

 certain fungous diseases. It is especially applicable for the 

 control of such diseases as the peach leaf curl, as has been 

 previously pointed out by many observers. It is equally 

 valuable in the treatment of Monilia and Cladosporium, which 

 occasionally attack the stem. 



The large and exceedingly well-cared-for orchard of Mr. 

 Elbert Bliss of Wilbraham offers one of the best examples 

 of the efficiency of the San Jose mixture as a fungicide. His 

 orchard, which covers many acres, was absolutely free from 

 any blemish due to fungi, both as regards foliage and wood. 

 The college orchard, which was sprayed for the San Jose 

 scale with the lime and sulfur mixture, has been remarkably 

 free from fungous troubles during the past season. Our 

 observations of other orchards have seemed to indicate that 

 spraying with the lime and sulfur mixture succeeds in con- 

 trolling to some extent canker, pear blight, black knot and 

 other diseases. We have frequently advocated early spring 

 spraying of trees before the leaves appear, with a solution 

 of copper sulfate at the rate of 1 pound to 50 gallons of water, 

 as we maintain that many of the common blights are more 

 successfully prevented by this spraying than by later ones. 

 It has been shown that early spraying with copper sulfate 

 has been successful in holding in check the black knot of the 

 plum. 



The San Jose scale may prove in more than one way a 

 " blessing in disguise." 



