A orchard plant lice 43 
in the valley o’f the Gunnison. Prompt action on the part of the 
orchardists where it occurs would almost exterminate it from our 
Western Slope. . 
Both the winged and wingless forms of this louse are deep 
shining black, the body is rather broad and flat and the cornicles 
are long and clyindrical. Cherry foliage may be fairly blackened 
by the lice before the early cherries mature. 
Dr. C. M. Weed,* who studied this louse in Ohio, found 
v;inged lice appearing in great numbers about June lo to July ist, 
and all lice disappeared by the latter part of July and remained off 
the cherry until late in September when he began to find winged 
migrants again. Though no alternate food plants were found. Dr. 
^^Ted Avas convinced that such plants existed and that it is the in¬ 
stinct of the louse to entirely leave the cherry trees during the late 
part of the summer. We have followed this louse quite closely 
for two years past about Fort Collins and have found its habits 
about as follows:, 
The lice first attract attention about the last of May upon 
sprouts about the trees, then upon the lower limbs, and by the 
middle of June may be all through the trees. About the first week 
in July their enemies, especially the lady-beetles, become very 
abundant and the lice rapidly disappear so that by the middle or 
latter part of the month they can only be found in scattered isolated 
colonies. Some of these escape their enemies and the lice gradually 
increase in numbers again late in August and in September, but, so 
far as we have observed, do not again become very numerous. At 
least, this louse did continue in this manner throughout the entire 
summer in 1907 and 1908 about Fort Collins where it Avas closely 
Avatched for us by both Mr. L. C. Bragg and Mr. T. D. Urbahns. 
Up to about June 15th. at Fort Collins, practically no Avinged 
lice can be found and by July ist. the great majority of the lice 
are either winged or pupae, and a good proportion of winged indi- 
Auduals continue in the colonies throughout the season. 
Besides the observations of the Avriters, Mr. L. C. Bragg has 
spent a considerable portion of his time every Aveek of the year 
for more than tAvo years past inspecting* plants of every kind grow¬ 
ing in the vicinity of Fort Collins, yet this louse has never been 
seen by any of us upon any plant but the cultivated cherry. \¥e 
are obliged to conclude, therefore, that this louse has no other reg¬ 
ular food plant in Colorado. 
remedies 
This louse should be treated Avith kerosene emulsion or one 
of the tobacco preparations before the Avinged lice appear to spread 
* Bull. Ohio Experiment Station, Technical Series, Vol. I, No. 2, p. Ill, 
1890. 
