6 



BULLETIN 785, TJ. S. DEPARTMENT OF AGRICULTURE. 



emulsion, and the Burgundy mixture was also made up with 3 

 pounds of bluestone. The tests show consistent decreases in copper 

 content of the coatings. 



CITRUS NURSERY STOCK AT BRADENTOWN, FLA. 



At Bradentown, Fla., comparative tests were made with three 

 strengths of Bordeaux mixture, made up according to 3-4-50, 

 2-2§-50, and l-lJ-50 formulas. The applications were made in 





/Vy^/PC// 



^3 



^a 



Fig. 3. — Field tests for copper on sour-orange leaves. A and D were sprayed with 3-i-50 Bordeaux mix- 

 ture; B and E, with 2-2|-50 Bordeaux itnixture; and C and J*', with l-lJ-50 Bordeaux mixture. A, B, 

 and C were in Nursery I; D, E, and F in Nursery II. 



February and March, 1918, on two nursery plantings of overgrown 

 sour-orange stock. In Nursery I the trees were about 6 feet high; 

 in Nursery II about 3 feet. A bucket spray pump was used, and in 

 each nursery measured amounts of spray were applied to equal 

 lengths of the nursery rows to secure a distribution of the spray as 

 equal as possible. The fresh weight of each leaf sample approxi- 

 mated 100 grams. Figure 3 shows the relative agreement of the 

 field test results with the strengths of spray applied. Plat F was 

 sprayed with the others on February 21, but the first sample was lost. 



