42 
The Colorado Experiment Station. 
This insecticide is not poisonous to man or higher animals, but is 
very destructive to most insect life. This powder is best applied 
with a small bellows that will drive it deeply into the cabbage head, 
as the powder must come in contact with the insect’s body in order 
to kill it. 
If the poisons above mentioned are used, the leaves will not 
be fit for stock food, but there will be no danger of poisoning peo¬ 
ple who eat the cabbage heads, as all of the outside leaves that catch 
the poison are removed when the cabbages are cooked. These ar¬ 
senical poisons must not be used on cauliflowers after the heads 
have begun to form, and should not be used on cabbage nearer than 
two weeks to the time when the heads are to be gathered. 
Cabbage Louse (Aphis brassicae ). 
The green cabbage aphis is often very abundant upon the 
leaves of cabbag'e, cauliflower and closely allied plants. The sur¬ 
face of the body of this louse is covered with a fine powder which 
will shed water and ordinary insecticide poisons, unless the appli¬ 
cation is made with a good deal of force SO' as to cause the liquid 
to wet through the powder. It is better still to wash the lice off 
the leaves. Strong soapy mixtures (a pound of whale oil or fish 
oil soap to each eight gallons of water), nicotine preparations such 
as Black-leaf 40, or oil emulsions, will be found efficient in the de¬ 
struction of this louse if used as a forceful spray. 
BEANS. 
Spotted Bean Beetle (Epilachna corrupta). 
This insect is very destructive to garden and field beans in the 
area adjacent to the eastern foothills of the Rocky Mountains, 
from Wyoming to Southern Colorado and far into New Mexico. 
The insect belongs with the lady beetles, but has acquired the habit 
of feeding upon plant tissues instead of plant lice and insect eggs. 
Its occurrence is not known in the states farther east. The adult 
insect is of a rusty yellow color with a number of small black spots 
upon its wing covers. The eggs are yellow in color and are laid 
in patches, usually of twenty or more, on the under side of the bean 
leaves and can hardly be distinguished from egg patches of the 
Colorado potato beetle. 
The grubs or larvae that hatch from these eggs are light yel¬ 
low in color and are covered with stout branched hairs or spines. 
There is only one brood of the insect during the year, but it con¬ 
tinues upon the bean foliage throughout the season. 
Remedies. —The use of insecticides for the control of this in¬ 
sect have not been very satisfactory. After much experimentation 
we'have come to the conclusion that the best methods of control 
