- 71 - 
/ . ... ■"'.".. 
the report. This aphid was also found to be abundant in the wheat fields 
of the extreme southwestern counties of Nebraska, by L. M. Gates during 
the' past week. 
Kansas. H. R. Bryson (April 24): During the past month reports of infesta- 
tions have come from 18 localities in as many counties, representing 
practically all sections of the State in which wheat is grown. The cool 
weather has been decidedly disadvantageous to the parasites and predators 
and very advantageous to the bug.- The complete absence of precipitation 
has been a contributing factor in increased infestations and the growing 
severity of old infestations. Reports indicate that injury is on the 
increase. The wheat has been retarded in its development. 
■ H. B. Hungerford (April 9): The green bug was causing some damage to 
oats and wheat in southeastern Kansas on April 1. It is present in oats 
and wheat in Douglas County •, and parasites are present-;. 
Oklahoma. C. F. Stiles (April 2l): The damage has increased during the past 
two weeks but seems to be at a standstill at present. Ladybeetles in all 
stages are very numerous in infested fields; and I believe they will 
check further spread. Internal parasites are present in small numbers. 
The cool weather during the past week seems to be holding them in check. 
The infestation is heaviest in Oklahoma, Logan, Payne, Pawnee, Osage, 
Noble, Kay, Garfield, and Grant Counties. There is a little infestation 
as far west as the western limit of Harper County. 
Colorado. G. M. List (April 2l): The green bug infestation is general over 
the eastern half of the State, being serious enough in Larimer, Yield, and 
Adams Counties to destroy a considerable acreage of wheat. Ladybeetles 
are quite abundant, and it is hoped that relief will come through their 
work. 
GRAIN APHIDS (Aphiidae) 
Oregon and Washington. L. P. Rockwood (March 3l): Very populous colonies 
of Rhopal o siphum prunifolj a e Fitch have been observed, especially on 
volunteer barley, but also on oats and wheat. Some yellowing of the tips 
of the leaves where colonies are established might be attributed -to them. 
We found them especially abundant in Clarke County, Washington, on March 
21, but there are about as many in some fields in the Willamette Valley 
of Oregon. They form more compact and populous colonies than Macro siphum 
granarium Kby., and I believe they are doing more damage. Alates of 
M. granarium were abundant on volunteer and early fall-sown grain in 
January and February. They are now coming upon wheat and oats in some 
fields. They do not appear to be so abundant as R. prunifoliae in most 
fields, although there was about an even mixture on oats in one late fall- 
sown field in Clarke County, Washington, on March 21. 
WESTERN WHEAT STEM MAGGOT ( Hylemyia cerealis Gill.) 
Colorado. G. M. List (April 21 ): The western wheat stem maggot has damaged 
a number of plantings of wheat, especially in Adams, Boulder, and Weld 
Counties. The infestation has been somewhat spotted, but some acreage 
will be destroyed. 
