205 
Journal of Agricultural Research 
Vol. XXIV, No 3 
Tabi<iS VI. —Inoculation tests with Pythiacystis citrophthora alone, compared with those 
with P. citrophthora pltis Fusarium sp. 
INOCUI.ATIONS MAD^ LOW ON TRUNKS OR 19-Y^AR-OLD LKMON TR^ES, FEBRUARY 
20, 1913 
Date of observation. 
Apr. I . . 
May 7.. 
June 27. 
July 28. 
Oct. 23. 
Nov. 25 
I9I3' 
P. citrophthora alone. 
Size of lesions. 
Gum 
formation.! 
Cm. 
0, .. 
I 
7-S by 3-8. 
3 
10 by 6.3. 
3 
IS by 7-S.• 
3 
33 by 13 (treated). 
3 
P. citrophthora and Fusarium sp. 
Size of lesions. 
Cm. 
O. 
6.3 by 2.5 
13 by 4... 
30 by 9... 
No record 
58 by 18.. 
Gum 
formation. 
INOCtEvATIONS MADE HIGH ON TRUNKS OF 21-YEAR-OLD LEMON TREES, FEBRUARY 2$, 
1915 
Mar. 4 .. . 
Cm. 
0 ... 
0 
Cm. 
0 . 
0 
Apr. 21. 
2.5 by 2.5. 
6.5 by 2.5 . 
8 bv . 
I 
«; by 2.*: . 
3 
May 18 . ... 
2 
0 by 7.r 
3 
5^pt. 4 . 
2 
^8 bv . 
3 
0 ^ J * .. 
I o»>uone; i—slight; 3=* medium; 3=-copious. 
Table VII. —Inoculation with Fusarium sp. at Santa Paula. 
Exper¬ 
iment 
No. 
Maximum results as to— 
Date of inoculation. 
Gum.* 
Initially killed 
bark at inocu¬ 
lation point.* 
Cracking of 
outer bark.* 
I 
Nov. 2^. 1012..... 
2 
I 
X 
2 
.do. 
I 
0 
X 
Feb. 20. 1012. 
0 
I 
0 
0 
A 
.do. 
0 
I 
2 
*T 
Mar. 14,. 1012. 
I 
I 
X 
0 
6 
.do.. 
0 
I 
I 
7 
.do. 
I 
I 
X 
/ 
8 
Tore. 
0 
I 
0 
Control cuts without inoculum, to correspond with 
nf .... 
0 
0 
0 
* o—none; 1—slight; 3 »medium. 
The progress of the disease on the tree inoculated with Pythiacystis 
and Fusarium on February 20, 1913, is more completely shown by 
Plate 5. The invaded area which was 58 by 18 cm. on November 25, 
1913 (PI. 5, B), the last date given in Table VI, had increased to 90 
by 41 cm. on February 6, 1915 (PI. 5, C-F). Extension vertically 
remained at 90 cm., but the lateral extension had increased to 61 cm. 
by March 9, 1916; and subsequently the entire circumference was 
encircled and the tree killed by the disease. 
