SOURCES 
OF APPLE BITTER-ROT INFECTIONS. 
13 
that the resulting cankers usually showed no differences in their 
development. 
Types of the cankers produced on the Winesap and Jonathan 
varieties are shown in Plate V, figures 4 and 5. 
TABLE I.—Results of inoculations of apple branches with bitter-rot fungus 
cultures at Arlington Farm, 
Apple variety and date of | Age of 
inoculation. 
~ 
8 
3 
a 
Ben Davis: 
MN CES aes eee eee | 
afishaYey 743) Soe eee ees 
S 
| 
il) 
ww 
J 
’ 
wh Wee 
jbranch. 
POPE FP whe pipe 
° 
' 
f 
; 
: 
6 
i 
' 
; 
PPP WE WPRPRNHE WwW Bore PR FPWR 
Via.,. in 1976. 
bo bo bo OV or 
Nw NRE 
Width os pee Condition! 
On On ee 
Aug. 2, | Aug. 29. On Aug, 29, On Nov. 20. 
Mm. Mm. 
3 | Margins intact..-.| Margins intact. 
2 to 5 | Su|eeaei- dO eae ane | Do. 
DAUOnl on ae ombO) Sales -ee GOs oes atee | Margins cracked. 
| 3 jaeeee COS Smee eer ; Margins intact. 
1 to 5 LStORS alee do. Do. 
4 | Bn eee dO Do. 
1 to 5 1 to 5 | Margins cracked .| Margins cracked; 
| callus formed. 
UO Bl) Uy Seas se dO sees: Oo. 
0 | Of |p Healling= sen se—- Healed. 
0 Og ease dose snes Do. 
OStop le ea afer Moesss2 s2bea.cl Do. 
4+o0 10, 4 to 10} Margins intact..-| Margins nearly in- 
tact. 
0 0} | PHealing= 42 54ee- Healed. 
Ost Opel a ee eases |e OnE ee ses Healing. 
4 4} Margins intact. -.-| Margins nearly in- 
tact... 
aia CORD | em Smt Owl Ol enema eset terete Margins intact. 
15 le bea e eons Accccacs | Do. 
0 OF @Elicalin gee Healed. 
0 OnE RSs dot Ae Do. 
2to 15] 2to 15) Marginsintact..-.| Margins intact. 
30 _ a) Needas GOMES ea oe ae Margins nearly in- 
tact. 
40 to 45 | 40 to 45 |...-- GOEste Seana Do 
1 55tOEZ0) el 54top20) |e == do. Do. 
1 Margins cracked..| Healed. 
0 tol ORtoORIE Aaere doze: Do. 
15 ibys soe se (C0 panes Sree Margins cracked. 
2mbOvly | Ee 2etOml he |emeee GOS eee Do. 
10 TOS) Sees do. Do. 
2etOml Ope 2nbOnl 5a | see do. : Do. 
arse GOs setae Healed. 
5 tonlOs| = Satonl Ose see GOP See Margins cracked. 
4 to 5 ARLOPOE Eee dota ee Do. 
30 SOR laos GOs ae Margins somewhat 
cracked. 
2 2a eilcalin gases eee Healed. 
1 Pls a5 COs aaa ees Do. 
2 2 | Margins cracked .| Margins cracked; 
healing. 
2 iil eeeer COM care Do. 
3 Baleedac GOs esac Do. 
The following general notes on all the inoculations were made on 
November 20, 1916, and on January 9, 1917: 
Ben Davis.—Except in the ease of the 1-year-old branches, the margins of 
eankers are intact. 
_ 
York Imperial.—Margins of cankered areas are separated from the bark of 
living portion of branch, and callus is forming. 
