- 92 - 
A mixture of calci'jm arsenate and sulfur wa? the most satisfactorv 
natorial for reducing the numlDor of ve-vil-cut buds on the straw"berry 
plant. Nonarsenical insccticidps proved to "be less effective, although 
dust mixtures containing rotenone resulted in the production of larger 
quantities of marketahle fruit thrn any of the other insecticides tested. 
United St?tos Departnent of Agriculture, Burea,u of Entomology and Plant 
Quarantine (393)'. in I936. 
Anderson and Walker ( 16 ) in 1937 reportpd that stravrterriea on 
the Eastern Shore of Virginia^ infested with the strawberry weevil, 
were dusted with a mixture of 85 pounds of dusting sulfur plus 15 
pounds of derris (5 percent of rotenone) and with other insecticides. 
Each material Vfas applied at the rate of Uo pounds per acre per applic- 
ation to plats of U "beds, 5 feet wide "by 120 feet Ion", replicated U 
times. Untreated check plats of similar size were included with each 
replication. Treatments were made vrith a Niagara 6-nozzle 1-horse 
traction duster equipped with a 20-foot "burlap trailer covering 1 "bed 
at a tiTiO. Records were taken of the relative number of buds cut, by 
counting 3 representative sam.ples of 100 buds in each plat, making a 
total of 1^00 buds for each treatment. Such counts were made on April 
2U, April 29, and May 6. Very little injury occurred after May 6. 
Yield records were taken nn May 22 and 25. The results are ishown in 
the following table; 
Increase in 
Buds 
Yield yield over 
Material 
cut ^1 
per acre'^'' untreated plats 
Sulfur-lead arsenate 5^1 
Lime-lead arsenate 5*1 
Sulfur-derris (0.75 percent 
rotenone) 
Sulfur-calciiJjn arsenate 5'1 
Untreated 
Percent 
(Quarts 
Percent 
15 
390 
62 
lU 
390 
62 
lU 
350 
U5 
7 
3I8 
35 
39 
2U1 
.J.' A difference of 6.27 ^nay be considered significant, 
^^ A difference of 59.9 may be considered significant 
Kolsall and Stulti ( 2U5 ) reported in 1937 that dcrris-gyT>sura 
dusts g?i.ve results as follows in laboratory tests! 
(Rotenone 
cent 
cnt) 
Mortality in 3 days 
Percent 
Percent 
1.0 
100 
.5 
100 
. .5 
90 
.2 
100 
.2 
80 
.1 
90 
V, A. Thomas ( 368 ) at Chadbourn, N, C. , reported in I937 that 
two or three applications of a clay dust containing 0,5 percent of 
rotenone gave a significant degree of control agr^inst the strawberry 
weevil when measured in terms of the numbers of marketable strawberries, 
but not vrhen measured in terms of reduction in numbers of weevil-cut buds. 
