= 10) = 
C. F. Doucette, of the Sumner, Wash., laboratory, reports that 
the peak of the adult period of the narcissus bulb fly was about the 
end of May, all adults being dead by June 28. Mr. Doucette began ex— 
periments in vapor sterilization on June 18. One lot of bulbs treated 
by this method in 1930 has been dug and weighed. For all sizes a marked 
percentage increase over the checks was noted. 
The Babylon, Long Island, laboratory has undertaken investigations 
of the nutritional requirements of the Eumerus larva and its possible 
relation to Fusarium fungus, the causal organism of basal rot. F. J. 
Spruijt of that laboratory also reports results of the bait-spray plots 
laid out as a result of the fruit fly studies in Florida. Copper salts 
are apparently little effective, but fluorine compounds give promise 
of good results. 
New equipment for the laboratories of the Division has largely 
been confined to that needed in the new laboratory in Hawaii. A new 
greenhouse, however, has been added at the Babylon, Long Island, labora- 
tory. An air-conditioning unit and a refrigeration unit have been ob— 
tained for the greenhouse-insect laboratory in Washington, D. C., the 
former being especially needed for vapor studies on the cyclamen mite. 
A double-sized air-conditioning unit has also been shipped to the labora— 
t ory at Mexico City to be employed, among other things, in studies on 
possible methods of treating food products. . 
TRUCK-—CROP INSECTS 
Owing to drought conditions in the desert area, the flight of the 
beet leaf-hopper, Eutettixtenellus Bak., as indicated by beet—field sur-— 
veys and trap catches, is not nearly so heavy as was the flight of last 
year, according to a report from Dr. P. N. Annand, Twin Falls, Idaho. 
Data from traps indicate that the majority of the insects entered the 
cultivated area from the south, whereas last season the hoppers came from 
a northwestern direction. A survey has recently been conducted in that 
area for the presence of E. tenelius and curly top in potatoes and beans, 
indicating very low populations in both crops. 
At the New Mexico field laboratory, Estancia, N. Mex., V. E. Rom— 
ney reports that in connection with flight studies over one million 
leafhoppers were colored with Magdalarot dye and liberated on the sand 
hills near El Paso, Tex. Many samples have been taken since to indicate 
their direction of flight, but very little information of value has been 
obtained. The value of this dye as a marker has, however, been demon— 
strated. Under field conditions specimens remained well marked eighteen 
days after being sprayed. Lacquer sprayed on the leafhopppers in May was 
found to be entirely faded after a month of exposure. 
