-149- 
In laboratory tests DDT (in acetone suspension) at 1 pound per 100 
imperial gallons of -water gave poor results as a residual poison on 
fruit. No flies were killed within 24 hours, and some were still liv- 
ing after 14 days. Two sprays of calcium arsenate in bordeaux ( 10-10-100) 
gave better control than two applications of Gesarol A-3 dust (3 percent 
DDT) in a field test on blueberries in New Brunswick.— Ross (306) . 
A plot of 43 trees in an old apple orchard was dusted three times 
with Gesarol A-3 dust (3 percent DDT). At harvesttime, 97 percent of 
the dusted apples and 100 percent of the check apples were stung. There 
were 8.68 stings per dusted apple and 25»92 stings per oheok apple, a 
reduction of 86 .5 percent on the dusted plot*— Lathrop ( 244) ♦ 
Miscellaneous Diptera 
Examination of "the ground under hairy vetch at Oregon City, 0reg», 
diaeXosred that 5-percent DDT dust had killed agromyzids and scatophagids. 
Syrphid larvae, whioh were abundant, appeared to be unaffected •— Rookwood 
and Reeher (503) ♦ 
Solutions of 1.2 and 2.4 percent of DDT in oil seemed to have an 
effect in reducing populations of a predaceous fly Thamat om yia glabra 
(lleigen), and parasites of the genus Solenotus (parasites on larvae of 
the pea leaf miner), all on peas. No apparent effect was obtained on 
chalcid parasites of the pea leaf miner.— Lange (241). 
SIPH0NAPTEBA 
Pulioidae 
Ctenocephalides canis (Curt.), the dog flea 
Fleas on short- and long-haired dogs were controlled with Neocid 
A-5 and A-10.— Parker (287 ) • 
DDT is a contact poison.— Domenjoz (135 ) • 
A 10-percent DDT dust controlled fleas on dogs.— Haseman (205 ) . 
Ctenocephalides felis (Bouche), the oat flea 
Cat and dog fleas in the basements of houses have been destroyed 
wi"th 3 percent DDT in pyrophyllite applied at 2 ounces per 100 square 
feet»— N. J« Agr. Expt. Sta, (275) . 
Pulex irritan8 L», the human flea 
DDT is a contact poison.— Domenjoz (135) . 
