1110 



THE FRUIT INDUSTRY IN NEW YORK STATE 



profitable. It is generally felt that they should not be planted for 



commercial use. 



Control. Wherever varieties are profitable but subject to 



rot, applications of self-boiled lime-sulphur wash are recom- 

 mended, as in the case of peach 

 spot, or scab, page 110$. Re- 

 peated applications of the spray 

 are advisable during the months 

 of June and July. 



Peach Leaf Curl 

 The fungus (Exoascus defor- 

 mam Fuckl.) that causes this 

 disease produces highly dis- 

 torted foliage. The infection 

 occurs 011 the leaf at the time the 

 leaves- break through the bud 

 scales, and by the time the leaf 

 is partly grown little red boil- 

 like areas have developed. 

 Later the areas increase until 

 most of the leaf may be in- 

 cluded. It then gradually grows 



misshapen, turns grayish white, dries, and drops. Heavy defolia- 

 tion often causes serious dropping of the fruit and a lack of bud 

 formation. 



Control. Leaf curl can be entirely controlled by a proper ap- 

 plication of lime-sulphur or bordeaux mixture. Lime-sulphur 

 solution is used for San Jose scale; when it is at scale strength, 

 a thorough application made before the buds burst will completely 

 control the trouble. If no scale is prevalent in the section, bor- 

 deaux mixture, 4-450, is usually cheaper and is equally effective. 

 Spraying can be done at any temperature above 32 degrees after 

 the foliage has dropped in fall and until the buds burst in spring. 

 In making spring applications, the grower should watch the de- 

 velopment of the terminal buds, and not allow them to burst be- 

 fore the spray has been applied. 



FIG. 355. SCLEROTIA STAGE OF 

 BROWN EOT ON THE GROUND 



