17 
with their offspring can be seen in clusters, and it is at this time very 
easy to destroy them by spraying, or even better, by hand-picking', 
which method I consider the best. I have myself gone over a Plum 
and Prune orchard twice, and was able to gather all the Phorodon pres- 
ent in a very short time. Mr. H. J. Miller, of Aurora, Oregon, at 
my request, kindly consented to collect all the lice upon his trees 
by going over his orchard three times at weekly intervals, and suc- 
ceeded remarkably well in cleaning them entirely of Phorodon, and this 
simply Uv hand-picking. To kill the lice a kerosene-oil can was used 
tilled about half with water and with 1 quart of kerosene, into which 
the branches with lice were immersed. I am confident that if, at this 
season, a united war were made against the Phorodon very few would 
ever reach the hop yards. A strong kerosene emulsion as a spray 
applied to Plum and Prune trees in the autumn and winter would 
destroy most of the eggs, and hand-picking or spraying in spring would 
almost, if not wholly, prevent these insects from migrating to the hop 
yards. 
REPORT ON OUTBREAKS OF THE WESTERN CRICKET AND OF CER- 
TAIN LOCUSTS IN IDAHO. 
(Report of an investigation made imder instructions from the Entomologist.) • 
By Robert Milliken. 
Owing to the shortness of the period in which I was enabled to give 
attention to the work, and other matters requiring a part of my atten- 
tion, I have been able to attend only to the distribution and general 
characters of the insects under consideration, and could not investigate 
in detail as I would have been pleased to have done. 
I have been able to learn of but two areas in the State in which 
locusts have caused any serious loss of crops, one being the valley of 
Boise Kiver in Ada and Canyon counties, extending from a few miles 
below Boise city to the confluence of the Boise with Snake Biver, and 
the other the Big Lost Biver Valley in the eastern part of Custer and 
Alturas counties in eastern Idaho. 
I made two visits to the Boise Valley, the first one the 24th of July, 
1893, and found locusts doing much damage in places, but not uni- 
formly distributed over the valley, being, in places, abundant enough to 
ruin oat fields and the second crops of clover and alfalfa,, and being 
particularly destructive to young orchards and gardens along the edges 
of the valley. Much interest is being manifested in this part of the 
State lately in fruit culture, and many orchards of Prunes, Peaches, 
and other fruits are being set out, and the locusts have, in many cases, 
7902— No. 1 2 
