inn and control of the citrus rusrf mite. A 2,000-mesh sulfur 
dust applied at the rate of ] - pound pei tree gave Longer protection 
si reinfestation than the standard 325-mesh sulfur a I 
pound per tree. A specially prepared wettable sulfur of 4,000-mesh 
particle size, used in ;' spray ;it 5 pounds per LOO gallons, with or 
with). ut added adhesives, gave much longer protection than 325-mesh 
wettable sulfur u-i'd at the s en in twice -lie amount. 
No harmful effects were seen on the tin-, out further ex; 
will be needed with these promising new combinatii 
In the control of the citrus thrips on lemon- in California a sulfur- 
dusting program which extended through the summer, with reduced 
quantities 01 material a- the weather became warmer, gave satisfac- 
tory control. During the past season only a slight trace of sulfur 
burn was noted in tin' tesl plots. A number of materials other than 
sulfur have been tested lor thrips control. A very effective method 
of rearing citrus thrips under laboratory condition- ha- been worked 
out. 
A further determination ha- been made by the Orlando laboratory 
that sprays, such as bordeaux mixture or hydrated lime with a 
sticker, that leave heavy noninsecticidal residues on leave- and fruit 
increase the populations of the purple scale and Florida red scale. The 
application of an ammoniacal copper carbonate, which leaves practi- 
cally no residue, failed to result in scale build-up. and the increase 
was negligible in trees receiving no sprays. 
In May 1939 the Florida laboratory was moved from Orlando to 
St. Lucie, near Fort Pierce, on the ea-t coast. At that point greater 
attention will be given to methods of controlling whiteflies and scale 
insects, especially the Florida red scale. With Sr. Lucie as head- 
quarters it will also be possible to devote more time to work with the 
papaya fruit fly and other pests of tropical fruits other than citrus. 
JAPANESE AND ASIATIC BEETLES 
The work on Japanese and Asiatic beetles has been continued by 
the laboratories at Moorestown, N. J., and Spencer. X. C. The 
area infested by the Japanese beetle increased in size about 1,266 
square mil-- during 1938 and now covers approximately 15,117 square 
miles. The out-i anding feat ures of the 1938 season were an unusually 
light infestation in the oldest infested urea, near Philadelphia, a 
somewhat Lighter infestation in much of New Jersey and eastern 
Pennsylvania north of the Schuylkill River, and the occurrence of 
extremely heavy infestations in northern Delaware, northeastern 
Maryland, and southeastern Pennsylvania, as well as a striking in- 
e in infestation in the metropolitan New York area. 
Several rotenone-bearing materials were found to have approxi- 
mately equal value as repellents \'<>r adult Japanese beetles. Efforts 
have been made, but without success, t<> determine the nature of the 
ingredient in these materials that Is responsible for tin 1 repellency. 
It w;i- Pound that the standard bait, containing geraniol and dove 
ol, decreased in attractiveness t<> the adult beetle- during the 
»n after the first week of exposure. The function of the eugenol 
i be largely t<> retard the loss in attractiveness oi the 
: '■; elf, lather than to increase its initial attractiveness. The 
