/ pee 
64. : 
The presence of the disease was observed the day previous to the 
first treatment, and had the weather which followed been ordinarily 
wet, the defoliation of the untreated plants would presumably have 
been much earlier. As the wet weather occurred late, the defoliation 
was not conspicuous much before the middle of August. 
Row I.—Treated with Bordeaux mixture, reduced formula (2 pounds copper sul- 
phate, 1 pound of lime, 20 gallons of water). 
Row I1.—Untreated. 
Row III.—Untreated. 
Row IV.—Treated with ammoniacal solution (2 ounces copper carbonate, 20 ounces 
ammonia (26°), 20 gallons of water). 
Row V.—Treated same as IV. 
The sprayings were made July 2, 14, and 25. To estimate the per- 
centage of foliage upon the treated and untreated seedlings the leaves 
of every twentieth tree were carefully counted on September 17 and 
18. At this time growth had quite generally ceased, and the results 
are thought to be of more value than if taken later, when the autumnal 
ripening of the leaves had begun and the potash, phosphoric acid, and 
starch had been withdrawn into the twigs.* 
The average number of leaves found upon the seedlings may be taken 
as representing inversely the relative loss to the plants. Thus the pro- 
portion of foliage lost by the seedlings of Row I to that of Row II 
stands as 16:110.7. The condition of the numerous rows standing on 
either side of the experimental portion was fairly represented by the 
condition of the untreated rows and afforded fully as striking a com- 
parison as that shown below. 
Row I.—Bordeaux mixture. 
Number of ‘trees <= 5.2. te ea eee ee ee ee ee 430 
Number‘of sample trees: 2 54-2e-) poset es 2 oa eee ee 21 
fotal numberof leaves! 223.2 ae ee oe ee 2, 325 
Average number of leaves? 222 eosc nee ee eee eee 110.7 
Row I1.— Untreated. 
Nuniber Of trees) 5a coe re ie ee eee ee ee 640 
Number of samplotrées 23224-22522 oe eens on ee ee eee 32 
‘otal num ber of leaves 24. 236 Ss ee ee ee eer 513 
Average number of, leaves #22 2. o.2t a ee ean ea ee 16.0 
Row II1.— Untreated. 
Number iof trees, 2224's: Fe poet ae mE ee ee ee ee 593 
Number.of santple trees. 2= 200 ce see ie eee ee 29 « 
Total number. of leaves.s.- 2-230 ace-c eis ose eee ee eee eee 437 
Average number of leavesss4.- {32-02 oe ae eee 15.0 
*Fliche and Graudeau, Ann. Chem. et Phys., ser. 5, vol. viii, p. 486; quoted by R. 
Warington in Watt’s Dict. Chem., ed. of 1883, Supple., vol. viii, pt. 1, pp. 813-816, 
