- 75 - 
1. 
2. 
3. 
4. parts, 
4* 
5. 
9 parts. 
flour 5 parts 
pyrethrum powder 
Paris green 1 part, hydrated lime' 2 parts, 
Paris green 1 part, hydrated lime 7 parts. 
Derris powder (5 percent rotenone) 1 part, 
diatomaceous clay 5 parts. 
Barium fluosilicate 1 part, flour 7 parts. 
Derris powder (5 percent rotenone) 1 part, diatomaceous clay 
. Where yield data were available, plots treated with paris green 
produced the greatest tonnage, followed by those treated with derris pow- 
der, barium fluosilicate, natural cryolite, and calcium arsenate, in the 
order named. The same station ( 31? ) in 1936 reported that 6 of the most 
promising insecticides (including derris) for controlling 3 species of 
cabbage : worms, including the looper, were tested in 1935. The insecticid 
were used in various strengths and with different diluent 1 :, stickers, and 
spreaders. The highest percentage (97 percent) of marketable heads was 
produced on plots sprayed weekly with paris green (2 pounds to 50 gallons 
of water), sulfated alcohol being used as a wetting agent. Average of 
90 to 93 percent of marketable heads were produced on plots dusted at 
weekly intervals with derris-powder-flour (0.5 percent rotenone) • The 
same station in 1937 ( 316 ) reported that the most successful, control of 
3 species of cabbage worms including the looper 7i;as obtained from paris 
green. Paris green sprays, 2 pounds per 50 gallons, gave from 81 to 93 
percent of marketable heads; paris green dust, 1 pound plus 12.5 pounds 
flour, gave 87 percent; derris dust, 1 pound of 4-percent derris plus 7 
pounds of flour, gave 58 percent; and derris spray, 1.5 pounds of 4-perce 
derris plus 2 ounces SS-3 to SO gallons of water, g?ve 70 percent of 
marketable heads. In 1938 ( 317 ) this station reported that derris powder 
talc dust apparently protected cabbage better than did the other material 
used. Three applications of sprays and dusts were made during the season 
on July 28, August 10, and August 24, ,1937. The crop was cut between 
September 26 and October 2, The derris powder used contained 4 percent 
of rotenone. The results were as follows: 
c 
Treatment 
m 
'/eight of cabbage 
Gross , : Trimmed , 
1 / 2 / 
per acre ±— ' • per acre ■=— ■ 
Loss 
Derris powder 1 lb., talc 
7 lb. 
Derris powder 1.5 lb. 
Grasselli spreader 4 oz. 
Water ^0 gal. 
Pounds 
31,698 
29, 448 
Pounds 
29,857 
26,994 
Percent 
8 
l/ Trimmed to meet U.S. No. 1 grsde, with the exception of worm 
injury which was not removed. 
2/ Weight after removal of worm injury. 
The Indiana Agricultural Experiment Station ( 213 ) in 1935 reported 
that the cabbage looper is harder to control than the other cabbage worms. 
Three series of experiments were conducted using in c -mparison derris, 
