BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 47 
acre plots received the same dosages of the respectrv 
the spring of 1953. Tobacco was planted Id these | ts Ler to 
obtain advance information on the possible effect i 
the cnred tobacco. 
Parathion Drench Controls Green June Beetle in Tobacco Beds 
Previous finding.? that a drench containing parathi 
rive against larvae of the green June beetle w 
further experiments in South Carolina. Dre esconl i _ Diane 
lettable powder or an emulsifiable concentrate of CS-708 were fairly 
effective, although less so than parathion. Drenches conta:: 
aldrin. dieldrin. EPN. and inalathion were of little value. Poisoned 
baits containing parathion or mythyl parathion were as effective 
as baits containing rluosilicates. now recommended for the control of 
these larvae. Baits containing lindane and dieldrin were less 
effective. 
Replicated tests with five insecticides were made in Tennessee, 
where green June beetle larvae were more abundant th 
1952. These tests showed that tobacco in plant b icted 
from these larvae with parathion drench 0.5 percent, i. ' >n drench 
1 percent, or parathion dust 1 percent. Each drench was applied at 
the rate of 100 gallons per 100 square yards. Aldrin dust 4 percent 
and dieldrin dust -i percent were only moderately effective. 
TDE Recommended for Control of Hornworms on Tobacco 
Experiments in North and South Carolina. Tenness Florida 
showed TDE to be the most effective of the avail 
can be used for control of tob d tomato b< rnw< 
Tests by several tob- es showed that the flavor an 
of cigarettes made fn b treated with TDE w< 
ted. Res nalysesof ti 
of only relatively small quantities of the : TDE was there- 
fore i \ I : control od 
published in Januar 
Laboratory toxicity tests in North Carol - - TDE- - 
as toxic to b hornworm larvae as toxaphene, and that it was 
slightly m s larvae, hu sCS-€T4A (Bulan) 
had about the same degi f toxicity to rm larvae - S-7 8. 
The latter, in turn, was slightly less I ^-7l ; ^. CS-728 
was consider . re toxic than TDE I S-674A and CS- 
?28 were quicker in ferilli _ than TDE. EPX was extremely 
toxic to hornworm larvae and fun tioned as a a 
stoma 
Experiments have - udrin to be the most effective ins 
tested thus far for the control of hornworms or a- festal 
of hornwi s. Its effect on the flav 
the cured and manui . 
hazards involved in its use, are being invest _ rests South 
Carolina showed id of endrin per 5 more effed 
killed hornworms quicker than 1 pound of TDE. CS-708, or CS-728. 
