-89- 
er mortalities than did a 70-percent cryolite mixture. The mixtures 
were applied with rotary hand dusters at 7-day intervals, at rates of 
15 to 25 pounds per acre. In another experiment in which the 10- and 
5-porcent strengths of IDT were applied at 14-day intervals the kill of 
weevils was greater than when the cryolite mixture was applied at 7-day 
intervals*— White (373) . 
Anthonoiaus grandis Boh., the boll weevil 
In cage and plot tests DDT dust was not so effective as calcium 
arsenate. In tests on caged plants the percent mortalities at Tallulah, 
La», were 75 from 10-peroent DDT and 84 from calcium arsenate, and at 
Waco, Tex., 16 from 10-percent DDT (16 pounds per acre), and 78 from cal- 
oium arsenate (8 pounds per acre) • In plots at Tallulah five applica- 
tions of 5-percent DDT dust failed to reduce the weevil infestation be- 
low that of the checks. In another experiment the addition of 2.5 per- 
cent DDT to calcium arsenate did not increase the effectiveness or pro- 
duce so much cotton as the calcium arsenate treatment. In other field 
tests in which DDT in pyrophyllite or mixtures of pyrophyllite and sul- 
fur were used for other insects, the boll weevil infestation was extreme- 
ly low but was not appreciably reduced by the DDT.— Loftin (247 ) . 
Anthonomus signatus Say, the strawberry weevil 
Gesarol A-3 dust (3 percent DDT) gave promising results in the pre- 
vention of bud cutting by this weevil and appeared to be more effective 
than a gypsum-cryolite (70-30) dust. The Gesarol was not available in 
time to apply it before bud cutting was well under way, so its full 
possibilities were not determined.— Ttoss (306 ) . 
Ceutorhynchus assimills (Payk.), the cabbage seedpod weevil 
In laboratory tests at Sumner, Wash., 10-percent 13DT dust showed no 
toxicity to the cabbage seedpod weevil. A bait spray containing 6 pounds 
of the 10 percent DDT-pyrophyllite mixture and 45 pounds of sugar in 100 
gallons of water was also ineffective •«TOiite (373) • 
Conotrachelus nenuphar (Hbst.), the plum oaroulio 
DDT appears muoh less effective than lead arsenate. Tests at Belts- 
ville, Md«, with DDT-pyrophyllite (1:1), applied with various fungicides 
at the rate of 1 1/2 pounds of DDT per 100 gallons, indicated little con- 
trol of curculio on apple and peach. At Fort Valley, Ga., 4 pounds of 
DDT (with wetting agent) per 100 gallons seemed to be about equal to the 
standard 2 pounds of lead arsenate for control of this pest on peach.— 
Baker and Porter (81). 
Gesarol AK-20 at 2 pounds per 100 gallons was inferior to lead arse- 
nate at 3 pounds per 100 gallons in tests in New Hampshire apple orchards 
during 1944.— Conklin (116). 
