10 
dust gave satis: >ntrol ght n .on in 1950 and near- 
I Of a m< te one in 1951 (tables 3 and 
. ed ir : to lindane and purified DDT and 
su{ • olite to cucumber or 
'i plants was ol I ->idue.^ ussed on page 
CS-674A, C " , I ( S-708 
J-674A proved superior I nilar material CS-645A in 1949, 
when a 2-percent dusts against a heavy infestation of the pickle- 
, hut these materials and a mixture of them known as CS-708 did 
not give adequate control (table 3). CS-645A was more effective in a 
spray than in a du: - . '. 5-percent CS-71 B dust gave adequate protection 
to cucumbers against a light infestation in 1950, but a 2-percent dust 
did not do so against a moderate infestation in 1951, being inferior to a 
0.5-percent lindane dust. Plants receiving CS-708 in 1951 had a higher 
melon aphid infestation than untreated plants . three 
materials showed no phytotoxic lty to cucumbers. 
DD I 
In the fall of 1948 a dusi containing 3 percent of a purified, or 
DDT (setting \ J°C.) caused no apparent injury to 
.< umbers; a similar strength of t- il DDT (setting point 9( C« 
dust caused slight to modei a'i i hlorosis i •-. Slight to 
moderate chlorosis of cucumbers, bul 'Id reduction, result 
m use of the p> : grad« 50. No difference in the degree of 
control of the pic kleworm affo .d purified grades 
nidi n the 1948 fall-season t le 3). 
purified gr-adt- A DDT ga\ ' 
Lnst tt. on worm and cucumber bed 
•cc of control of the pickli 
hlor. '. I 
in on cucuml and in 1 
not so lite, 
Lning : DD l 
pickli 
■ , -i, : :.• to 14 d 
■ 
| 
