STITUTION LIBRARIES 
iii 
01272 7244 
beings or domestic animals. If it is not used in liberal quantity, 
however, a proportion of the caterpillars are merely numbed by this 
mixture and recover. Younger caterpillars are more susceptible. 
Hand-picking.—F or the kitchen garden where, for obvious reasons, 
it is undesirable to use arsenicals, hand-picking is sometimes practiced, 
especially when plants are first set out. 
The corn-meal remedy.—According to Prof. L. Bruner, corn meal 
dusted on cabbage causes the ‘‘worms”’ to drop off, and protects the 
crop until the meal is washed away by rain. It is applied in the morn- 
ing while the dew is on and is said to act as a deterrent. 
Clean farming and trap crops.—lf cooperation in clean methods of 
farming and in the use of arsenicals could by any possibility be secured, 
much of the loss due to the ravages of this pest might be averted. The 
practice of leaving cabbage stalks in the field after the main crop is off 
isareprehensible one. All remnants should be gathered and destroyed 
with the exception of a few left at regular intervals through a field as 
lures for the females to deposit their eggs. Such stalks, being useless, 
should, where feasible, be freely poisoned with arsenicals so that the 
last generation will have no place to develop in the fields. 
The utilization of natural enemres.—It 1s matter of common obser- 
vation, frequently recorded, that the two parasitic enemies of this 
species (Pteromalus puparum and Apanteles glomeratus) do excellent 
service in reducing the numbers of their host. The means by which 
they can be encouraged is described on page 6. 
Attempts have also been made to utilize diseases of this insect for its 
control, but without very encouraging results. 
Hellebore will kill this ‘‘ worm,” but is not as satisfactory a remedy 
as the arsenicals. 
Trap leaves.—A remedy suggested by one of our correspondents was 
tested by the writer against this and other cabbage ‘‘worms,”’ includ- 
ing the looper, and found worthless. It consists in placing fresh cab- 
bage leaves over the heads at night, the supposition being that the 
“worms’’ will gather under these traps and can be destroyed next 
morning. 












Approved: 
JAMES WILSON, 
Secretary of Agriculture. 
WasHINGTON, D.C., April 28, 1905. 
O 
