52 
BULLETIN" 746, U. S. DEPARTMENT OE AGRICULTURE. 
two clips when in the cane stalks than when they are first taken out 
and then immersed. The reason for this is that a certain amount of 
fluid remains in the tunnels after the stalks are removed from the 
solution, and continues to affect the insects. 
To test the effect of immersion and fumigation on the germination 
of cane cuttings, a number of tops and bottoms of the varieties DT4 
and Louisiana purple were treated in the fall and planted in the 
experimental fields. Table X shows the number of healthy plants 
on May 13 and at the grinding season. The " dip " was a very 
thorough immersion of the cuttings. Fish-oil soap solution appar- 
ently increased the percentage of germination, while no treatment 
can be regarded as injurious. Table XI shows the weight of cane 
in pounds of cane from the treated seed at grinding. The fish-oil 
soap solution appears to have increased the tonnage, though this 
result is doubtful. 
Table X. — Germination of treated seed cane. 
Treatment. 
D74. 
Tops. Bottoms. 
Louisiana purple. 
Tops. Bottoms. 
Check (not treated) 
Bordeaux mixture, dip (6-4-50 formula) 
Bordeaux mixture, 1 hour immersion (6-4-50 formula). 
Fish-oil soap, dip (one-half pound per gallon of water). 
Fish-oil soap, 1 hour immersion 
Check (not treated) 
Tobacco extract (40 per cent nicotine as sulphate), dip 
(1 part to 500) 
Tobacco extract (40 per cent nicotine as sulphate), 1 
hour immersion (1 part to 500) 
Potassium sulphid, 3 pounds to 100 gallons of water, dip. 
Potassium sulphid, 3 pounds to 100 gallons of water, 1 
hour immersion 
Potassium sulphid, 1J pounds to 100 gallons of water, 
lhour 
Hydrocyanic-acid gas, 1 hour fumigation (1 ounce, 20 
cubic feet, 1-2-4 formula) 
U8-73 
21-81 
26-94 
34-94 
44-119 
14-85 
26-73 
39-100 
d2=100 
43-108 
35-118 
39-103 
20-79 
22-82 
28-88 
26-91 
31-89 
21-90 
21-74 
31-86 
29-91 
34-87 
26-91 
( 2 ) 
44-89 
45-88 
46-86 
37-95 
49-94 
45-93 
36-95 
55-88 
46-123 
53-108 
45-112 
53-96 
36-71 
42-87 
29-81 
39-72 
38-91 
51-79 
53-86 
48-85 
51-90 
37-70 
42-94 
41-77 
1 Number of healthy plants on May 13 (first figure) and number of stalks at the grinding season (second 
figure), the seed cane having been subjected to various treatments before planting. 
2 Seed cane taken by unknown person. 
Table XL — Weight of cane grown from treated seed cane. 
Treatment. 
D74. 
Louisiana purple. 
Tops. 
Bottoms. 
Tops. 
Bottoms. 
1160 
154 
188 
224 
238 
158 
142 
168 
158 
178 
166 
204 
192 
208 
164 
204 
220 
238 
138 
158 
158 
164 
164 
( 2 ) 
230 
208 
214 
226 
212 
214 
168 
178 
228 
18S 
154 
212 
160 
194 
184 
176 
214 
Check (not treated) 
188 
Tobacco extract (40 per cent nicotine as sulphate), dip 
Tobacco extract (40 per cent nicotine as sulphate) , 1 hour 
158 
138 
Potassim sulphid, 3 pounds to 100 gallons of water, dip. 
Potassium sulphid, 3 pounds to 100 gallons of water, 1 
hour immersion 
148 
134 
Potassium sulphid, H pounds to 100 gallons of water, 
dip, 1 hour immersion 
184 
156 
i Weight of cane in pounds at the grinding season is indicated by the numbers, the seed cane having 
been subjected to various treatments before planting. 
2 Seed cane taken by unknown person. 
