33 
Table 5. --Infestations of the melon aphid on fall cucumbers treated with 
several insecticides for pickleworm control, 1951. All insecticides 
applied as dusts unless otherwise indicated. 
Insecticide 
(figures indicate percent) 
Average 
dosage 
per acre 
Melon aphid 
index rating—' 
Count 1 
Counts 
1 and 2 
Pounds 
Experiment 1 (5 applications at 5- to 10-day intervals 
Parathion 0.5 
Lindane 1 (4 applications) 
1 
0.5 
DDT 2 (purified) 
Cryolite 50 
Untreated 
Least significant difference at odds of 19:1 
99:1 
20 
21 
20 
20 
20 
21 

3 
8 
25 
5 
32 
16 
44 
78 
221 
247 
701 
40 
108 
53.1 
100.5 
71.5 
135.4 
Experiment 3 (3 applications at 10- to 13-day intervals) 
Dieldrin 2.5 
25 
Endrin 1 
23 
Lindane 1 
22 
0.5 
22 
Aldrin 2.5 
23 
Heptachlor 2.5 
22 
Methoxychlor 10 
21 
CS-708 2 
21 
Nicotine 1 plus bis(p-chlorophenyl) sulfide 4 
24 
1 plus polyethylene glycol (600) 
monolaurate 4 
23 
Zineb 4, product B 
22 
product A 
22 
Lindane 0.025 (emulsion spray) 
Untreated 
Least significant difference at odds of 19:1 
99:1 
Gallons 
45 
8 
25 
5 
37 
9 
50 
17 
77 
23 
65 
38 
268 
201 
597 
313 
997 
293 
1,025 
304 
1,082 
336 
822 
357 
1,165 
16 
79 
130 
745 
141.4 
345.2 
188.6 
460.4 
l/ Counts were made 1 week apart during the middle of the harvesting 
period. 
