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a 
Treatment for the Horn Fly. 
“ * * In reply to your question ‘What is being done by the people in your 
neighborhood in regard to the Horn Fly?” I have to say, hardly anything. Thereis 
a spasmodic attempt being made to fight this pest, but nothing systematic. On 
our place we have several times thoronghly annointed our fattening cattle with a 
mixture of axle grease, tar, and carbolic acid. This keeps the fly from worrying them 
for several days. This week I had a mixture of fish oil, tar, and carbolic acid thor- 
oughly rubbed over our milk stock. The flow of milk has not been very much in- 
ereased as yet. Heretofore their time has been taken up in fighting the flies, whieb 
made them so restless it was hard to milk them at all. Now they stand much better 
and, in fact, this mixture has been of great benefit. I shall have it renewed in a few 
days, and shall advise our people through our county papers to use this or some sim- 
ilar remedy. If you find out any other remedies for this pest, keep me posted. * * * 
—[J.S. Strayer, Port Republic, Va., June 26, 1891. 
A New Enemy to Currants 
_ Isend you a bug which I find f eeding on white and red currants. I have not been 
able to find it on any of the forest growth here and in 6 years have not seen onelike 
it. I presume it is not an abun dant insect.—[H. Stewart, Highlands, Macon County, 
North Carolina, June 10, 1891. 
REePLy.—* * * The insect is the so-called Leaf-footed Plant-bug (Leptoglossus: 
phyllopus). Itis found commonly throughout the South and, although its habits are 
normally predaceous, it has occasionally been noticed to pierce cotton bolls and the 
buds of different plants. It has not before been noticed, so far as I am aware, as an 
énemy of currants. If it is sufficiently abundant to do much damage I would advise 
you to spray with a dilute kerosene emulsion made according to the formula given on 
page 3 of Circular No. 1, second series.—[June 22, 1891. ] 
A California Thrips on the Potato. 
I mail you to-day specimens of a Thrips that is very injurious to the leaves of potato 
plants in various portions of Los Angeles County. I find them only on the under 
side of the leaves, and when numerous they cause the part of the leaf which they at- 
tack to wither and finally to die. I saw one field of about 100 acres of potatoes of 
which a large percentage of the plants had been seriously injured by these pests. I 
alsofound them in large numbers on Onion, and this species may prove to be the same 
as the one I sent you specimens of from onions last year. Besides potatoes and 
onions I also found them in large numbers on a plant commonly known as ‘‘Tumble- 
weed ;” on this they were even more numerous than on the Potato. I would be glad 
to receive the name of this Thrips and to learn whether or not it is an introduced 
species. Iam now carrying on a series of experiments against it with Paris greem 
and whale-oil soap and will report results.—[D. W. Coquillett, Los Angeles, Cal., 
June 8, 1891. 
RepLy.— * * * This is the same species which you sent last year upon onion, 
and is a new species of the true genus Thrips.—[ June 17, 1891. ] 
Rocky Mountain Locust in North Dakota. 
FIRST LETTER.—I send you by mail a few specimens of an insect that has made its 
appearance here in some spots in great numbers. We believe it to be the Rocky 
Mountain Locust. It was first noticed a week ago. They seem to haye been hatched 
on stubble land that was not plowed. Their ravages haye so far been confined to 
grain bordering on such land. At night they leave the grain and roost on the ends 
of praizie grass near by, Whenever they walk or jump it is towards the south, 
1 do at. 
