Pecan Diseases, and Spraying Outfits 185 



Copper sulfate (blue stone) 4 pounds 



Lime (unslaked) ...... .- 6 pounds 



Water 50 gallons ^ 



From three to four sprayings should be given during the 

 growing period. The time of the first application will depend 

 largely on the season, latitude, and time of appearance of 

 scab. Under average conditions scab may be expected to ap- 

 pear in small spots on the leaves of pecan trees in the south- 

 eastern states, the latter part of May or early June, necessi^ 

 tating the first application of spray. The second spraying is 

 given in the latter half of June or about three weeks following 

 the first. The third is put on about the middle of July, and 

 the fourth from the 15th to the 20th of August. 



In some cases bordeaux mixture causes severe foliage injury 

 to pecans. This may be overcome partially by the substitution 

 of a lime-sulfur or a modified lime-sulfur spray (one gallon of 

 concentrated lime-sulfur solution added to a 1-2-50 bordeaux 

 mixture) for the third and fourth bordeaux sprays. The 

 lime-sulfur spray may be made by adding one gallon of con- 

 centrated lime-sulfur solution to fifty gallons of water. 



PECAN ROSETTE 



There is a divergence of opinion as to the cause of pecan 



^ Dissolve the copper sulfate in a small quantity of hot water in a 

 tub or barrel. Slake the lime in another vessel and make it up to 25 

 gallons with water. Pour the two solutions into a third vessel at 

 the same time and stir well. Bordeaux mixture should be strained as 

 it is put into the spray tank. As copper sulfate solutions attack iron 

 or tin, they should be prepared in stone or wooden vessels. When it 

 is desired to spray for insects, as the case-bearer, bud-worm. faU 

 webworm, and fungous diseases at the same time, one pound of 

 powdered arsenate of lead is added to each 50 gaUons of bordeaux 

 mixture. 



