52 



BULLETIN 746, U. S. DEPARTMENT OP AGRICULTURE. 



two dips 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 D74 

 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, lj pounds to 100 gallons of water, 



1 hour 



Hydrocyanic-acid gas, 1 hour fumigation (1 ounce, 20 



cubic feet, 1-2-4 formula) 



US-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 



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. 



Check (not treated) 



Bordeaux mixture, dip 



Bordeaux mixture, 1 hour immersion 



Fish-oil soap, dip 



Fish-oil soap, 1 hour immersion 



Check f not treated) 



Tobacco extract (40 per cent nicotine as sulphate), dip 

 Tobaccoextract (40 per cent nicotine as sulphate), 1 hour 



immersion 



Potassim 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, 



dip, 1 hour immersion 



Hydrocyanic-acid gas, 1 hour fumigation 



D74. 



Louisiana purple. 



Tops. 



Bottoms. 



Tops. 



Bottoms. 



i 160 



192 



230 



160 



154 



20S 



208 



194 



188 



164 



214 



184 



224 



204 



226 



176 



238 



220 



212 



214 



158 



238 



214 



188 



142 



138 



168 



158 



168 



158 



178 



138 



158 



158 



228 



148 



178 



164 



188 



134 



166 



164 



1.54 



1,84 



204 



( 2 ) 



212 



156 



1 Weight of cane in pounds at the grinding season is indicated by tho numbers, the seed cane having 

 been subjected to various treatments before planting. 



2 Seed cane taken by unknown person. 



