-92- 
ri^rr per day. The hogs remained normal in behavior and pained 31.5 pounds 
of weight each over a 30-day period.— Farrar ( 150 ) . 
The granary weevil, which is the most injurious grain insect, has 
teen almost entirely eliminated from granaries with DDT (applied 1 to 5 
times) both in larval or full grown stage.—Ahlberg and Mathlein (69). 
A DDT-dust mixed with wheat (1:20,000) was effective against the 
granary weevil.-- Smallman (322) . 
Almioide dust containing 8.9 percent of DDT idien mixed with wheat 
1:20,000 killed 100 percent of granary weevils within 9 days.— Ross (306 ) . 
Sitophilus oryz a. (L.), the rice weevil 
In a test with seed wheat (12 percent moisture content), 0.05, 0.025, 
and 0.005 peroent by weight of technical DDT was added to 500-gram samples. 
The samples were put in glass jars with adult weevils. At the end of 
the first week all three dosages gave a complete kill. In a similar test 
a 3 percent DDT-pyrophyllite dust was highly effective at 15 p. p.m. of 
DDT after the first week. Samples of wheat of 14 and 16 percent moisture 
content were treated with DDT at the rates of 0.05, 0.1, and 0.2 peroent 
by weight, iiach sample was artificially infested with 100 adult weevils, 
and 10 days later all insects were dead.— Cotton et al. (120 ) ; also 
Packard (285) . 
Gesarol dust (3 percent DTVr) when mixed with rice 1-1,000 killed 
all weevils in 30 hours; at 1-2,000 it killed all in 48 hours; at 1-10,000 
the insecticide had practically no effect after 6 hours and 48 hours elapsed 
before nearly all the weevils acquired a toxic dose; at 1-50,000 practical- 
ly all weevils were destroyed after 72 hours.— J. (224 ) . 
Two lots of seed corn, with 300 rioe weevils added to each lot, were 
treated with a 3-percent DDT dust at 2 ounces per bushel on April 14 and 
stored in barns at Clemson and at Summerville, S. C. They were insect 
fr©« on November 14. DDT gave complete protection and germination was 
not affected. Untreated lots of corn were badly eaten and heavily damaged 
by the rioe weevil, Angoumois grain moths, the cadelle, and other stored 
grain insects. — Cartwright (108) . 
Dermestidae 
At ta genu s piceus (Oliv.), the black carpet beetle 
Larvae of this insect were reedily killed when confined on a surface 
deposit of 20 mg. of DDT per square foot, applied as a talc dust. Resi- 
dues from sprays containing W in Deobase or other solvent were less 
effective, but did give control at higher concentrations of DDT.— Goddin 
and Swingle ( 179) . 
