4 BULLETIN 833, U. S. DEPARTMENT OF AGRICULTURE. 
Lakes and the northern and central Atlantic seaboard. On the Pa- 
cific coast 1t is reported from California and Oregon, and its presence 
has been confirmed in South Dakota, Tennessee, and Georgia. 
Doubtless a careful survey would locate many additional isolated 
infestations which have not been brought to the attention of State or 
Federal entomologists. 
VARIETIES AFFECTED. 
While the chrysanthemum midge has been recorded from central 
and southern Europe as seriously injuring the common white or ox- 
eye daisy (Chrysanthemum leucanthemum), as well as C. corymbosum, 
C. atratum, C. japonicum, and C. myconis (11), its depredations in 
North America are confined to practically all of the commercial 
chrysanthemums, both the single and pompon varieties. The first 
infestation in this country was reported on the variety Mistletoe, 
and according to Felt (14, 15, 16) this variety appears to be very 
susceptible to the attacks of the midge. 
Although several attempts have been made to infest the Shasta 
daisy and the common field daisy, C. leucanthemum, it has not been 
possible to get the ovipositing female to lay eggs on them. This is 
of much importance, for should the infestation spread to this common 
weed, there would be great difficulty in eradicating this pest. 
A. Gibson lists the following varieties as being fairly free from injury: 
Bob Pulling, Gertrude Peers, Daily Mail, Oconta, Mrs. G. C. Kelly, 
W. Wood Mason, F. T. Quilleton, and E. T. Quittington. All the 
above varieties are the blended product of C. indicum and C. mori- 
folium, both of which grow wild in China and Japan. He reports 
the following varieties as being practically ruined: Smith’s Advance, 
Ivory, Bonnaffon, Wm. Turner, Western King, and Englehart. 
Observations made by H. F. Dietz in the Middle West showed 
that the Wm. Turner variety had lost all the crown buds. In case 
of a thick infestation on the variety Dr. Enguehard all of the plants 
had to be discarded early in the season; also all Chadwick varieties, 
as wellas Elberon, Major Bonnaffon, and Golden Mensa. ‘The varie- 
ties which seemed to be least injured were Golden Age, Harvard, and 
White Bonnaffon. 
In some of the greenhouses of the District of Columbia during the 
season of 1918-1919 such varieties as Mensa, William Turner, and 
the white and yellow Bonnaffon were completely ruined on account 
of the severe infestation. 
ECONOMIC IMPORTANCE. 
Although a comparatively recent introduction this imsect now 
seems to be firmly established in the United States and is one of the 
most important pests to be reckoned with by chrysanthemum 
growers. 
