New Yorx Aaricutturat Experiment Station. 755 
Through a misunderstanding these cabbage plants were not 
transplanted, as was intended, to test whether the vitality of the 
plant was injured by the bisulphide fumes. It is recommended 
though, that all seedsmen who raise cabbage seed, open the pits 
a few days before time to set the cabbage in the field, place 
shallow dishes in the pit, using one for every 10 cubic feet of 
space, and in each dish put not more than one teaspoonful of carbon 
bisulphide for each cubic foot of space. Close the pit and leave 
closed two or three days. Care must be taken not to spill any of 
the liquid on the plants as it will injure them. Care should also 
be taken not to use this liquid around a fire or flame of any kind 
as the fumes are liable to catch fire and cause an explosion. Also 
remember that the fumes in close quarters are death to all animal 
life. 
A series of tests of the fumes of this liquid on lettuce were 
_ made in tbe laboratory in a tight glass chamber. One fi. dr. to 
every 1.5, cubic feet of air space killed the Cabbage Moth cattr- 
pillar and plant lice. Temperature of the room approximately 
65 degrees. Lettuce injured. The least quantity used was one- 
quarter fl. dr. to every 1,5, cubic feet of space, or approximately 
one fi. dr. to every four cubic feet of space. This, at a temper- 
ature of 5‘) degrees after three hours’ time, killed part of the 
Cabbage Moth caterpillars, a few revived afterward; it did not 
injure the plants. [For plants as tender as lettuce only one fluid 
drachm should be used for every three cubic feet of space. 
Second — Other Remedies. Nearly as many remedies have 
been recommended for this pest as for the European cabbage 
worm. It should be remembered that plant lice are only killed 
by insecticides which smother or kill by contact. None of the 
poisons will kill them. The best remedy for outdoor purposes is 
_ kerosene emulsion diluted with 10 parts water. It should be 
applied to the lower as well as the upper sides of the leaves, and, 
if possible, while the cabbage are small. A number of tests of 
Pyrethrum, Persian Insect Powder and tobacco dust were made 
in the laboratory. Of these tobacco was found to be the most 
active killing agent. Pyrethrum and Persian Insect Powder are 
considered good, but are liable to be adulterated and to lose their 
strength. 
