46 
THE COST OF THE TREATMENTS. 
In an experiment of this kind the question of cost is only to be looked 
upon as valuable from a relative point of view. Itis safe to say that 
in places where spraying is conducted on a large scale the cost of the 
work would be nearly 50 per cent less than what our figures indicate. 
The figures given in the table below are based upon the same estimates 
for chemicals and labor used in the grape experiment. 
TABLE 18.—Cost of the various treatments made at Still Pond, Md., for pear leaf-blight, 
scab, and cracking. 





No. of : Cost of ‘ 
Tree. | treat- Kind of treatment. Fungi- fungi- Cost of | Total 
arse cide used.| “aida. labor. cost. 
Gallons. | Cents. Cents Cents 
1 2 AMMONIACALSOMNULON = sees asec eee 2.58 2.0 207 4.7 
2 See [emciaer OT RE REBAR RSENS SAE ae Bato gaken te 3. 58 2.8 4.1 6.9 
3 fetal eee OO Sos sce eee ae ee eee 6. 58 aya 9.6 14.8 
4 2 Modified\eanm) celeste sc. =~ 7-22-25 eee oe 2.25 6 2.7 3.3 
5 Si lawton COs. cows ces ee ee made oo aeer oe 3. 25 .8 4: 5.0 
6 (he te) eee GO) 3.35 ek SOs nas ee oa ee ee 5. 25 1.4 9.6 11.0 
7 2 Precipitated carbonate of copper solution| 2.58 sf ZT 3.4 
8 Baer cesta LO erie nate ee ce nese er ner oyn eeroeetetere 3. 83 1.0 4.1 5.2 
9 ae Cera OG: 2. Soca ea bone So cee seme ee eee 6. 83 1.9 9.6 IHS 
10 2 Copper saccharate-22- <2 e205 5. -s eee ee 2.33 .9 2.7 BHT 
11 Bj 050 |S Sees CO 28 2 ioe Bs Soa Reese aeeewasee oe 3. 20 1.3 4.1 5.4 
12 (il (BERS es eee se eS a 6. 20 2nd 9.6 12.2 
13 2 Glneimixbures eee nee aaa ieee 2. 66 “9 2.7 Sel 
14 SPaibkensec DOS: sos ae taeee eS eee ee eae eee 4. 28 1s 4.1 Sai 
15 The “lessee COR Seen see ke Be es ee ee 7. 28 2.6 9.6 12.3 
16 2 Bordeaux MIXtUnes= eee ae eee eee 2. 33 6 2.7 3.4 
17 3 ae eee G KN Se SSG aC re Cmercricicis GOMAS AC Seer 3. 58 1.0 4.1 5.1 
18 ren eee GOW a2 see cece eee ermae eteeeeteeccion 6. 58 1.8 9.6 ate 13) 
19 2 Copperacebatela=--s-ecse see = eer essence 2. 66 ail 2.7 2.9 
20 Se iiseeee 0) Sa Ree oo ee ee een nee 3. 66 ave 4.1 4.3 
21 (aes ee Sao CO iijas2 tase Cabs see ences roe 7. 66 4 9.6 10.1 
22 2 Copper chloride mixture..-...--..----.-.- 2. 66 6 2.7 3.4 
23 Siete eee CO ke soe een eee eee Seer memes 3. 91 9 4.1 5.1 
24 i ell sees QO nh eseased ee Seems eek eee eno Sede 6.91 we 9.6 IES: 
25 | 2 | Potassium sulphide solution.......-..-.- 2. 58 .2 2.7 2.9 
26 ae eee DO 2S cae eee ae ee Sees rea 3. 83 aC: 4.1 4.4 
27 aed ee ee CORR See see ee eee haat .o 9.6 10.1 
28 2 Sodium hyposulphite solution ..-...----- GG: nt eee 2.7 2.8 
29 Be eaecee GO! esse ea Oe eee ae 3. 66 1 4.1 4.2 
30 To Wesscee GO. seco mat ox cemarose Soeeniee wes cere 7. 66 1 9.6 9.8 
| 



SUMMARY. 
The results of the work, as set forth in the foregoing tables and re- 
marks, may be summarized as follows: 
(1) As preventives of both Entomosporium and scab on the fruit, 
the copper compounds gave decidedly better results than those in which 
no copper was used. 
(2) Of the eight fungicides containing copper compounds, the ammo- 
niacal carbonate of copper solution and modified eau celeste gave the 
best results in the prevention of leaf-blight, cracking, and scab, when 
all the treatments are considered. 
(3) In all cases the seven treatments were more beneficial than the 
smaller number of two or three, although the difference in most cases 
was not sufficient to warrant the four additional sprayings. It is notice- 
able, however, that on the trees treated three times both scab and 
