19, 2 Lee: Citrus-canker Control 143 
TABLE 7.—Degree of canker affection of trees in Plat IV of the College 
of Agriculture citrus planting at Los Batos—Continued. 
Leaves affected, 
Species. 
‘ August, 1917. August, 1918, 
Per cent. |Number. | Per cent. | Number. 
SUMS ANOS oc oe oer ee ee eee ees eecteter 10 
OG a ee ea ee a! gs SOE M 7 ES Pee ANTS 
OO SR 5 2 ak ha ee eae ty ee eo L fivedbhogcs 
CRPUG INOUE ooo eS oe eee DO cae gcc fe RRO Hes 
WG nei ceccsc i ee ee ee oe ge eM, FEL Slee, 16 
BO ES Se ese Mage adelaeisigs te 5 
DIG inte Sse S incekhiekteicas cokes ect eke tL 4 BSNS nee Pree eee 21 
BG Son ghs CoOS tak ce a ee ee a rf Rode ee olin alge 18 
It is apparent that some reduction in the amounts of canker 
infection was accomplished in the foregoing plats. 
PLAT V, AT LOS BANOS 
The trees in this plat were of the same species and varieties 
as those represented in Plats I, II, III, and IV. This plat was 
left entirely untreated, as a check upon the sprayed plats. 
TABLE 8.—Degree of canker affection of untreated trees in Plat V, of the 
College of Agriculture citrus planting at Los Bajfios. 
Leaves affected. 
Species, 
August, 1917. August, 1918. 
Per cent. | Number. | Per cent. | Number. | 
OOPS Wehner ege Ti ade ea oan Ne Sac 40 
Dee si toes ci ee Bet th te os rt eee Re eer aie a 
Le See ee IRENE IONE WOM OT STE Ds Pe Ee TEE ed eee) te Cela 1 
MBnncgemicoeibuss is hE bee ae Se 87 
eerie Weide 2 OO a ee eS 0 0 0 0 
WO ies nh. ee 0 0 0 0 
Sellen Cenwtiths gi 5. Syed on ce pone ete dete aan cs A VEE Sere = 
2, Mein eed eee abe Bas alice ase Sat | & RE ee ame, 
ie EE RN RIES eA E G H PIS eee PO Dire aa, ELE ,  pefiacteeipmen 10 
ee RP REN Soe SOL G EAA LER Si a 37 
ae aaa peepee eee ee eee pve os ed ea 
| 1 Bae siege ents Say violin Se gee tee OO ee ; a eee |e erence 
WO cr eae Pe ie en eS OE! Aire | ee bh 12 0 0 
seth oreih EME Fs GN ETRE Cite DEE A MC BEE Eee ee 10 0 0 
Citrus aurantifolia... cae Sie ee 5 
Si ee. oes Bi ee 20 
RO ions a oe i 9} Sees ee Rea dae 
cb ee aE go ee eeecarg ota Ae em Me ing od 1 0 0 
Citrus mazr Pag ie BO Sea 21 
pO ieee sn er ie a sacar a oe She ZT [ocecccsoas 
