- 14 
ni en1 of polyethylene glycol (600) monolaurate and 20 per- 
cent adequate control of the pickleworm in 1951 
(tal 
P irathion 
P on was among the most effective materials tested, but was 
h extei: !s as lindane, DD'I, i ryolite, and methox 
chlor. It gave good control of the melonworm and the melon aphid in 
18, and of the mel< 1951 (table 5). Parathion was less 
ef than gamma BHC and lindane against the pickleworm, when 
used as 1 -percent dusts (tables 3 and 4). A 0.5-percent parathion dust 
inferior to a 0.5-percent lindane dust against the pickleworm in 
1951 (table 3). The residual effect of parathion against this insect did 
not appear to be so lasting as that of lindane, cryolite, and DD'I . 1 
itions of a 1- percent parathion dust at intervals of 7 to 8 days 
gave almost adequate protection to cucumbers against a heavy pickle- 
worm infestation in 1949; four applications of a 0.045-percent parathion 
suspension gave excellent i i that season (table 3). Similar use of 
a 1 -percent dust provided adequate control of the lighter infestation. 1 - 
ntings being treated with zineb in 1950 (table 4) and 1951 (table 3). 
1 his insecticide showed no phytotox to cucumbers even though in 
1950 as many as seven applications of a 1 -percent dust nade, 
beginning when the plants had only one to three true leaves. 
A spray containing 0.028 pi ■ , a proo mtaining 
methyl parathion and parathion, was among the least effei atenals 
used against th< orm in e nent 1 >0, and did not 
provide adequate control of this insect (table 3). 
P ' hrum 
p. ■ ethrum dusts showed a high degree of t. s 
In I e tests. An impri ted 0.4- 1 - dust 
kill of all 'f the pickleworm in I An 
thrift Fifth-ii 
. . a t killed all Fourth In 
he fifth ii . ."• tly fr 
em the 0, 
ercent 
■ 
Whei 
r 
: , and 
