258 Report OF THE HORTICULTURAL DEPARTMENT OF THE 
4 
3. Effects of bordeaux mixture containing an excess of lime: 
(a) As to injury, 
(b) As to control of the scab fungus. 
4. Effects of bordeaux mixtures made with varying quantities 
and varying proportions of copper sulphate and lime: 
(a) As to injury, 
(b) As to control of the scab fungus. 
An apple orchard on the Station grounds was available for the 
experiments and 27 Rhode Island Greening and 18 Baldwin trees 
were selected for the work. The trees are 55 years old, normal 
and healthy in growth, and were selected from a considerably 
greater number of the same varieties in the orchard to give unt- 
form plants for the experiment. The varieties named were selected 
‘because both are susceptible to injury from spraying and because 
they are the sorts most commonly grown in New York. 
The usual treatment for apple scab in this State consists of three 
applications of bordeaux mixture; the first before leaf buds open; 
the second, just after blossoms fall; third, ten days to two weeks 
later. The first application is omitted when an orchard has been 
treated with lime and sulphur for San José scale. The Station 
orchard had had this lime and sulphur treatment and it was neces- 
sary to give but the two last mentioned applications to comply with 
the custom of apple growers. 
The 45 trees were divided into nine plats, each containing three 
Rhode Island Greenings and two Baldwin trees. Each plat was 
sprayed with bordeaux mixture as follows: 
Plat (1) 1 lb. copper sulphate—1 Ib. lime—so gals. water. 
Plate(2) 2. ibs. a a oa Ao), fees. Saaae ‘ 
SENAY RSM ie I nS ie a ee 
Plat (4) Ae sane ze) A ee ‘ “ 
Plat (5) Check. 
Plat (6) Tb. ys Wee ae thee ath a 
Plat (7) 2 Jbs. F A —4 “ tt Sa Be «“ 
Plat (8) 3 Cp 3 &§ ere o Poe eS teil geen “ 
Plat (9) 4“ , fe koe ee a 
Arsenate of lead was used at the rate of three pounds to fifty 
gallons of water on all the plats. The time and the conditions 
under which the plats were sprayed will be given in the discussion 
of the several experiments. ; 
