‘ STRAWBERRY ROOTWORM ON GREENHOUSE ROSES 37 
HAND PICKING 
| Many florists, failing to control the beetles with sprays, fumigants, 
or traditional “cures,” had recourse to hand picking as a last resort, 
/ thus assuring themselves of the positive removal from consideration 
_ of all beetles collected and killed. In some establishments the work- 
ers merely collected the beetles visible on the plants, sometimes using 
ordinary pans. Others devised more thorough methods, such as 
beating the plants with a stick in order to jar the beetles into a pan 
) held between the crossrows. For this purpose they used a special 
) pan about 3 feet deep, wide enough to span the bench, and which 
/ had the lower ends rounded to reach underneath the plants. Oil 
was kept in the bottom of the pans to kill the beetles coming in 
Fic. 16.—Muslin curtains used to separate sections of an open range of greenhouses 
during fumigation with hydrocyanic-acid gas 
contact with it. Paddles covered with sticky fly paper served a 
similar purpose. 
These methods were very effective, particularly when the beetles 
were gathered on the “bleeding” ends of the cut-back plants (fig. 
11), where they were plainly visible. In one greenhouse where the 
plants had been cut back in April over 1,000 beetles were collected 
on 3,000 plants, even though they were not very numerous because 
the new brood had not yet begun to appear. 
In another place, where no other control measures were practiced, 
the workmen took advantage of the adults’ habit of climbing the 
wire supports after the plants had been syringed, by spending an 
hour after this operation each day in collecting and killing the 
beetles. Large numbers were thus disposed of. This method was 
followed diligently day after day throughout September and. October 
of 1921, when many adults were present, Cleanliness was also prac- 
