Whorlbd Milkweed 
35 
ing the summer season. In no case has any success been obtained 
by this method. One Japanese gardener near Delta, pulled or 
hoed the milkweed out of an onion patch ten times during the 
summer of 1918 and yet the stand seemed uninjured, during 1919. 
Fig. 26 — Plot IV in June 1919. The heavy stand of sunflowers shaded and 
held in check the few milkweed plants that came back. 
Some farmers are reporting good results from pulling the 
plant late in the summer when the ground is wet. Other reports 
are to the effect that this treatment does not kill any of the weed. 
In no case which has come under the writer's observation has 
this method given results that would warrant its recommendation 
as a means of eradication. In some cases the pulling has resulted 
in a thinning out of the stand and on wet, rocky hillsides, where 
the only object sought is to keep the plant from going to seed 
and to prevent poisoning while driving in the fall, this method is 
probably the best and cheapest to apply. 
Under the direction of the Experiment Station, Mr. Robert 
Mead three miles east of Grand Junction, tried out a modification 
of the method followed in Plot VI, of the Montezuma Valley ex- 
perimental plots, with very encouraging results. The field he 
worked on was the one previously mentioned, from which hay 
had been cut containing the milkweed that resulted in the poison- 
ing of six head of horses. The field was plowed early in August 
to a depth of 4 to 5 inches, and allowed to lie until early in Sep- 
tember, when it was plowed again and planted to winter wheat. 
The wheat got the start of the milkweed the following spring and 
