
Like dias 
Late in July Dr. H. E. Ewing started on another field trip to 
Virginia and North Carolina, in order to continue his studies on the 
biology of chiggers. 
TRUCK-CROP INSECTS 
J. E. Graf, in Charge 
M. C. Lane, in charge of the field laboratory at Walla Walla, 
Wash., visited Bozeman, Mont., July 17 to 19, where he conferred with 
entomologists and other agricultural workers regarding the wireworm 
problem in the Pacific Northwest. 
O. BE. Gahm, of the field laboratory at Arlington, Va., visited 
mushroom houses in Ohio and Minnesota during the greater part of July. 
He also spent some time at the University of Minnesota, where through 
the courtesy of that institution he was able to conduct some tests on 
the thermal death point of certain mushroom pests, 
J. E. Dudley, Jr., in charge of the field laboratory at Madi- 
son, Wis., reports that in the vicinity of Columbus, Wis., the heavy, 
beating rains early in July reduced the infestation of the pea aphid to 
a lower point than has ever before been reached since the work on this 
insect was started in 1922. After this low point was reached and re- 
production had nearly ceased, as the pea crop approached maturity a large 
number of several species of natural enemies began to take their toll 
until, at the time of writing, July 350, there was less than one aphid 
per sweep of the net. Conditions in that locality were just the opposite 
of those in northeastern Wisconsin, where rains have been neither fre-—- 
quent nor heavy, and a heavy infestation with considerable loss to the 
pea crop has been experienced. It is believed at present that the heavy 
rains were the principal factor in the great difference between the in- 
festations in the two localities. 
C. G. Woodbury, of the National Canners Association, Washington, 
D. C., visited the summer laboratory at Columbus, Wis., during the early 
part of July. 
P. N. Annand has been appointed associate entomologist, to under— 
take studies of the sugar-beet leafhopper at Davis, Calif. 
W. A. Shands has been appointed assistant entomologist and assign— 
ed to work on the sugar—beet leafhopper at Salt Lake City, Utah. 
F. R. Lawson has been appointed temporary field assistant, for 
duty at Salt Lake City, Utah. 
