264 REPoRT OF THE ENTOMOLOGISTS OF THE 
TRAP CROPS. 
(1) Beans.— The bean has often been recommended as a food 
plant to be used to keep the beetles from cucumbers. In sections 
of the country where golden rod is not plentiful during the fall, 
the planting of beans in and along the margins of cucumber and 
melon fields about September 1 ought to make a good crop upon 
which to poison the new brood of beetles. As soon as the beetles 
are noticed feeding upon the bean vines, the latter should be 
thoroughly dusted with green arsenite (copper arsenite’®) or even 
Paris green. Although not tested, I doubt if beans would be a 
good trap crop to use in the spring unless they were younger and 
more tender than the vines of the crops being protected. If the 
beetles cared more for beans than for cucumbers they would be 
found in the bean fields instead of in the cucumber fields during 
the spring. Possibly beans could be used in small gardens as a 
spring trap-crop in connection with covers. 
(2) Squashes.—In 1898, a series of tests on the use of squashes 
as a trap-crop the details of which are given under the head of 
“ Field notes,” were carried out on an extensive scale in the pickle 
section of Long Island. The results show that, by planting 
squashes around the margin of the field where cucumbers or 
melons are to be planted, the beetles will not disturb the ecucum- 
bers, and, if several plantings of the squashes are made and al- 
lowed to remain on the field, the beetles will disturb the cueum- 
ber vines but little during the whole season. We do not recom- 
mend the planting of squashes simply to feed and grow the beetles 
upon, on condition that they will not disturb the cucumbers, but 
do recommend their use with other measures as followed in the 
field tests. Squashes, if used rightly, answer the purpose for 
which covers are used. The beetles feed on them and thus allow 
the cucumber and melon vines to make their early growth undis- 
turbed so that. they can better withstand later attacks. Further- 
16 Lead arsenite is also colored and sold under the incorrect name, green 
arsenite. 
