-90- 
Ten peach trees were sprayed three times with 2 pounds of 20 per- 
cent DDT in 100 gallons of water to control the plum curculio. Owing 
to the low temperature of March 30 these trees held very little fruit, 
and comparable records of curculio infestation were not possible. There 
was no burning of foliage.— Fletcher (155 ) . 
DDT, 1 pound per 100 imperial gallons of water, was less effective 
than 5 pounds of acid lead arsenate, both used with either wettable sul- 
fur or oopper oxychloride.— Ross (306 ) • 
DDT failed to control curculio.— N. J. Agr. Expt. Sta. ( 275 ). 
Three applications of a spray containing 2 pounds of A-20 per 100 
gallons of water caused no damage to foliage of peaches and no reduction 
in injury by curculio,— Dnderhill (349 ) . 
Peaches sprayed with 4 pounds of a wettable powder containing 25 
percent of UDT yielded 49.6 larvae per 100 drop fruits. In the same ex- 
periment identical applications of standard lead arsenate, 2 pounds to 
100 gallons, averaged 32.3 larvae per 100 fruits.— Neiswander (274). 
Curculio caryae (Horn), the pecan weevil 
Curculio rectus (Say), the chestnut weevil 
In preliminarv tests DDT gave favorable results.— Baker and Porter 
(81). 
C ylas fortaicariu8 elegantulus (Summers), the swoetpotato weevil 
In laboratory tests at Opelousas, La., DDT was toxic to the sweet- 
potato weevil but not so toxic as potassium fluosilioate. The 10-peroent 
DDT gave mortalities ranging from 82 to 98 peroent, as compared with 98 
to 100 percent with undiluted potassium fluosilicate and 80 peroent with 
undiluted oalcium arsenate.— White ( 373 ) . 
Cylindr q c opturus eatoni Buchanan, the reproduction weevil 
A 1-percent DDT emulsion was effective in Calif ornia.— Craighead 
and Brown (125 ) * 
Listroderes obllquus Klug, the vegetable weevil 
In laboratory tests vapo-sprays and a 3-percent DDT dust were applied 
directly to the larvae or to l/4-inch carrot sections on which the larvae 
were later placed. The vapo-sprays containing 1.2 or 2.4 percent of DDT 
required 3 days to cause 100 percent mortality. The dusts containing 1 
percent of DDT killed all weevils in 6 to 9 days.— Lange ( 242 ) . 
