12 
BULLETIN 94 . 
Two days later, word came to the Station that some worm 
had appeared in great numbers in many of the fields of young 
beets. A ride through the infected area in company with Mr. 
Charles Evans, manager of the Fort Collins Beet Growers’ Associa¬ 
tion, revealed the fact that nearly if not qnite all of the injuries 
from worms were to fields that had been plowed in the spring. In 
most of these fields considerable alfalfa was growing at the time 
of onr visit. 
To avoid such injuries as the above, do not allow lamb’s 
quarter {Chenopodium sp.) to grow in proximity to other crops, 
and, in case alfalfa ground is to be put in to cultivated crops it 
would be better to plow the previous fall, but in any case keep 
the ground sufficiently cultivated to keep down any growth of 
alfalfa which might attract the moths for the purpose of egg-lay¬ 
ing early in the season. 
THE GOOSEBERRY FRUIT-WORM (Dakruma Convolutella) (?) 
The gooseberry fruit-worm has become a serious pest, espec¬ 
ially to currants, along the foot hills of the eastern slope in this 
State. It is not uncommon to hear that this insect has destroyed 
the greater portion of the crop. It also feeds freely upon a com¬ 
mon wild currant, Ribes aurium , which grows in the foothills, a 
fact which adds much to the difficulty of keeping the pest in check. 
PLANT LICE ( Aphididse .) 
Several species of plant lice were extremely abundant again 
during the past summer. Various insecticide substances have 
been used experimentally against these lice both in the egg and in 
the later stages and a press bulletin, No. 20, entitled “Plant Eice 
and their Remedies,” written by Mr. S. Arthur Johnson has been 
issued by the Station. 
The apple plant louse (Aphis pomi ) has been extremely abun¬ 
dant and quite destructive to small trees in some localities. For 
several years past there have been many trees, particularly small 
ones, that have had many of their small limbs literally blackened 
with eggs of this insect. Such trees are common in the orchards 
of Northern Colorado during the present fall. I have observed 
such trees for several years and have never known more than a 
very small fraction of the eggs to hatch in the spring. In fact in 
some cases I have been unable to find that any of the eggs upon a 
tree have hatched. I am confident that not more than one egg in 
a thousand hatched in the vicinity of Fort Collins last spring and 
yet by the middle of June the lice were common in orchards and 
gradually increased in numbers so that from the middle of July 
on through the summer the lice on the apple trees of this section 
were exceedingly numerous. I have never seen any evidence that 
