
ea ie 
Interesting results of feeding experiments with this wireworm are 
reported by Mr. Campbell: "In one year 18 one to two year old P. cali- 
fornicus larvae reared in salve cans consumed 2,476 kernels of wheat, 
or an average of 157 kernels, which is equivalent to 4.52 grams of wheat 
per individual each year. (30.3 kernels wheat = 1 gram.) Mr. Campbell 
Submits a table which shows that a population of one larva per square 
foot, or 46,560 larvae per acre, will consume 196,891 grams, or 434 pounds 
of wheat, and that the consumption of wheat increases proportionately 
with the increase in the number of larvae per square foot. 
C. E. Woodworth, of the soil insects laboratory at Walla Walla, 
Wash., has been making a study to determine the value of pollen in the 
production of eggs from adults of the wireworm Pheletes canus Lec. It 
was found that feeding pollen increased egg production frcem an average 
of 28 eggs per female to 125. Mr. Woodworth says, "another interest— 
ing observation is that 196 eggs were laid by one female fed pollen af-— 
ter mating, this being a high egg production for this species." 
R. S. Lehman, Walla Walla, has been conducting baiting experiments 
against the larvae of P. canus, with ground whole wheat balls placed as 
controls for the poison baits employed. The poison baits were of the 
same material with the poison added. The poison baits and the controls 
were placed in the field alternately, one or two feet apart. Mr. Lehman 
reports that "out of a total of 1,500 baits 24,821 Pheletes canus larvae 
were obtained, which is an average of 16.5 larvae per bait. * * * In the 
poison bait experiments it has been very strikingly shown that the ar-—- 
senates and arsenites are repellent to P. canus larvae." 
been the subject of study by E. W. Jones, Walla Walla. He concludes: "it 
is evident that 15° F. (-9.4° C.) was below the freezing point of the lar- 
yvae. However, the adults seem to have lower under-—cooling points than 
the larvae. Since there is such a great variation in such a group of in-— 
dividuals it is to be expected that many survive 15° F. (-9.4° C.)." 
W. C. Cook, Davis, Calif., reports on further study of the migratory 
movements of the beet leafhopper (Eutettix tenellus Baker): "F. R. Law- 
son has made a careful study of the migratory movements south of Los 
Banos and he has concluded that in the southern part of the San Joaquin 
the movements into the canyons occur largely where there is no food out— 
side. He states, 'The spray program seems to be very successful down to 
and including Big Panoche; in this section there are practically no per- 
ennials on the plains that remain succulent. Bugs are forced into the 
canyons. I would like to point out that the patch of polycarpa outside 
the mouth of Little Panoche and the larger one outside Big Panoche held 
as many bugs as were in the canyons per unit area. The implication is 
that bugs go into the canyons because there is no food outside, '" 
