a 2 
well defined as under more normal weather conditions. During March an 
average of approximately 3 adults per row were founc in some of the 
fields of mature celery, whereas ordinarily an average of 50 adults 
per row were found just prior to the incidence of heavy infestations. 
At the close of March celery was being rapidly harvested from the 
fields and it appeared unlikely that leaf tier control would be nec- 
essary. In fact, the infestation has not been sufficient, to allow 
: 
the avplication of experimental insecticide tests. 
Winter mortality of Mexican bean beetle.--N. F. Howard and H. C. 
Mason report that at Columbus, Ohio, the samples of Epilachna corrupta 
Miuls. taken from hibernation cages on March 15. indicated a beetle 
survival of approximately 32 percent, as compared with a survival of 
36 percent for the same period in 1933. A minimum sir temperature of 
~15°9 F, and a minimum "undercover" temperature of 18° F. were recorded 
at Columbus during February 1934. 

R. L. Wallis reports that at the close of March the Mexican bean 
beetle survival in the hibernation cages lecated on both the north and 
south slope exposures of the foothills of the Estancia Valley, N. Mex., 
varied from slightly less than 10 percent on the north slope exposures 
to slightly more than 10 percent on the south. The high percentage 
of winter mortality is appurently attributed to the small amount of 
precipitation during the autum, winter, and s,ring, as the tempera- 
tures have been above normal during this period. 
Hibernation studies on Mexican bean beetle at Norfolk, Va., 
emphasize importance .f clean-up measures.--Sxaminaticns were con- 
ducted by L. W. Brannon, Norfolk, Va., on January 3, for adults of 
E. corrupta in hibernation in an old pole lima bean field in which 
the dead vines were matted about the poles at the surface of the 
ground. A total of 99 live beetles were collected on .003 acre, or 
at the rate of approximately 33,000 per acre. The results emphasize 
the importance of cleaning up ell plant debris in the fall after the 
crop is harvested in order to reduce the infestation the following 
Spring. On February 20 additional examinations were made in this same 
field and live beetles were found. These beetles had survived a nin- 
imun temperature uf 6° F. on February 9. 

Tests show close correlation between temperature and kill of 
herlequin bug with rotenone s rays.--In conducting field toxicity 
tests on blurgantia histrionica Hahn in 1933, Mr. Brannon observed 
that 20 adults in each treatment, when sprayed in the field and placed 
in field cages over sprayed plants, yielded the following data: 

esl eel 
