44 SOME INSECTS INJURIOUS TO TRUCK CROPS. 
first favorable place that they find. This early hibernation is usually 
temporary, and when the first warm day comes they emerge from 
their hibernating places and hop around on the ground, retreating 
again when it becomes cool. 
PLACES OF HIBERNATION. 
During the winter the beetles were observed hibernating in cracks 
in the trellis poles, under the string of the string pegs, in the hollow 
vine stubs, in the grass and weeds, and in the soil. 
Beetles in poles—The beetles were first observed to be hibernating 
in the trellis poles. By lifting the slivers they were found wedged 
between the slivers and the solid wood, some were dug from rotten, 
porous portions of the poles, and a few were observed under the bark. 
Many were found in the deep cracks, but the largest number were 
under the slivers and in the rotten wood. As shown by Table III 
the majority of beetles hibernated close to the ground. They ac- 
cepted the first shelter that they came to, and some even entered 
slivers and crawled down below the surface of the soil. 
TaBLE III.—Position of hop flea-beetles in the poles. 
MiTst fo0ts 22 S22 See Se ee eS ee et had a eee _ eli ee See: 182 
Secondutoote 22 he Ee eS oe Re eS re eee ee 152 
Third POO GER eb SoS. 20 ees ee ee ee 79 
Mourth foots. -- ss oe Oe ee 33 
1 EVE i} gigi 010) ca Ss ane me pa ree ey ee ode ey aA AP Se cP, ieee ET 4 
Sixth: f£00t.2 22 28 3s ee eS Ee ee ee ee ee 6 
Séventh foots. 2.2 eS ae Se eae 0) 
Total mumber of flea-beetles == a ae eee 456 
Number of spolesscounteda22= == eee 74 
Average number of beetles per pole_-___-_-_-______~________ 6.16 
In November, 1908, several poles were taken into the hop kilns and 
heated in order to bring out the beetles that were hibernating 
therein. Most of the poles contained small numbers of them, but in 
one badly splintered pole were found 490 beetles. These results 
led the hop growers to believe that a large majority of the hibernat- 
ing beetles were in the poles. In investigating this point the writer 
had four average poles taken into the kilns and heated. Only 19 
beetles were found in these 4 poles. These, together with other 
results obtained from extensive field counts, proved conclusively that 
the number of beetles which were hibernating in the trellis poles 
was not dangerously large. 
Beetles in the vine stubs—The hollow vine stubs which are left 
when the vines are cut and burned in the fall are very favorable 
hibernating places, and as many as 16 beetles have been found in a 
