bs) @ koe 
cent, 32.2 per cent, 21.2 per cent, and 75.4 per cent, respectively. In 
a section located from 200 to 300 yards away from the woods, the percent— 
ages of infestation for the same varieties were 3.9 per cent, 13.6 per 
cent, 11.0 per cent, and 9.0 per cent, respectively." 
Most infested narcissus bulbs contain only one larva of bulb fly.—- 
C. F. Doucette, Sumner, reports on a four-year study (1928 to 1931) of 
the larval population of M. equestris in narcissus bulbs. In 9,976 bulbs 
recorded, 93.38 per cent were infested with 1 larva; 5.75 per cent with 
2 larvae; 0.80 per cent with 3 larvae; 0.07 per cent with 4 larvae; 
and 0.01 per cent with 5 larvae. 
ec ee a ee en rae 
bulb insects. "It was found that in the stronger dosages sodium fluoride 
(4 ounces to 4 gallons of water) and sodium arsenite (4 ounces to 4 
gallons of water) cause considerable burn to the narcissus foliage. 
A subsequent decrease in yield, below normal, may be expected. The 
cherry fruit fly bait spray (lead arsenate with sugar, black-strap 
sirup, and water) is not quite so toxic to the bulb fly when used fresh 
but when exposed to the weather becomes more potent with age. No in— 
jurious effects on foliage or yield were noted. After 42 days of exposure ~ 
in the field, during which 4.76 inches of rain were recorded, the six 
sprays discussed in the report. were still present on the foliage and were 
found strong enough to give 100 per cent mortality within 2 days." 
Fall migration of beet leafhopper.-—Summarizing a study of the fall 
shift of Eutettix tenellus Bak. out of the summer breeding grounds, W. C. 
Cook, Davis, Calif., says, "the fall migration into the winter breeding 
grounds apparently does not move farther than 15 or 20 miles, unless 
there are enormous populations in summer breeding grounds. This reduces 
the problem of weed control to an area of not over 15,000 or 16,000 acres." 
Breeding of dipterous parasite of bean beetle.—-B. J. Landis and 
R, W. Brubaker, Columbus, Ohio, report that "Breeding of the parasite 
Paradexodes epilachnae Ald., and host, the Mexican bean beetle, continued 
through December in the laboratory. The life cycle of the parasite was 
lengthened by maintaining the puparial stage at a temperature of 52° to 
54° F. There appears to be some selectivity of the more hardy individuals 
held within this temperature range. After several generations of the fly 
bred under these conditions, the temperature at which the puparia will be 
held will be lowered in an attempt to breed a hardier strain of flies." 
Mr. Brubaker noted that in a constant—temperature cabinet run within a 
known relative humidity range, the addition, a day before the fly would 
normally emerge, of a slight quantity of water to the blotting paper 
lining the bottoms of the Petri dishes containing puparia accelerates 
emergence. "Previously it was found that fly puparia lost weight rather 
gradually from the time of pupation to within one or two days prior to 
emergence. However, weighings made on these last two days prior to 
