THE EED SPIDER OX HOPS IX CALIFORNIA. 
BAXDIXG WITH TANGLEFOOT. 
Banding with tanglefoot has become the chief method of control- 
ling the hop flea-beetle (PsyUiodes punctulata Melsh.) hi British 
Columbia, and as the mites also work up the vine mainly by crawling 
it was deemed advisable to attempt to check their progress by means 
of the tanglefoot bands. In order to test this method, 10 infested 
hop vines were selected. A few 
leaves were removed to prevent 
brids:in£, and in some cases the 
vines were stripped; tree tanglefoot 
was then applied to the vines in 3- 
inch bands. (See fig. 6.) About 20 
badly infested leaves were next at- 
tached to the vines below the bands 
and the lower parts thus thoroughly 
infested . During the f oUo wing week 
these vines were continuously ob- 
served. Hundreds of mites were 
found around the lower edges of the 
bands, and in cases where the lower 
leaves had been stripped off some 
web was found at the base of the 
tanglefoot, but there was no evidence 
that the mites had crossed over. 
Although mites were seen above 
the bands, these probably were car- 
ried there on the observer's hands 
during previous observations. 
Similar experiments were con- 
ducted in 1912, except that some 
foliage was left below the bands on 
which the mites could multiply and 
from which they could migrate. 
Three weeks' observation failed to reveal mites above properly banded 
vines, but after this time the tanglefoot became filled with sand and 
was not effective. 
One large-scale experiment with tanglefoot was attempted, but 
the work was done so late hi the season that a few mites were already 
above the point of banding and no definite results could be obtained. 
Banding with tanglefoot in itself will probably not act as a control 
for the red spider, but hi yards where late clean culture is not practi- 
cable it will probably protect the sprayed vines from the late summer 
migrations. 
Application. — It is necessary to get the tanglefoot well into the 
spaces between the two vines, the simplest way to accomplish this 
Fig. 6.— Hopvines banded with tanglefoot, in an 
attempt to prevent the mites from ascending. 
(Original.) 
