:. -91- 
sulfur were equally effective against the bollworm. All plots received 
calcium arsenate in the foregoing mixtures at the rate of 7.76 to 9 
pounds per acre. Yfoen the rate of application of calcium arsenate was 
reduced to 7 pounds per ajsre, as in the mixture of calcium arsenate plus 
lime, the yield was likewise reduced. Pyre thrum plus sulfur dust (0.09 
percent total pyrethrins) did not prove effective against these pests. 
Wilcox and Stone ( 484 ) in 1940 reported that cube dusts were tried in 
1937 at Costa Mesa, Calif., for control of the tomato fruitworm. Three 
applications were made June 10, June 24, and July 8. Results were as . 
follows : 
Treatment 
Cube (1 percent rotenone) 
Cube (1.5 percent rotenone) 
Cube (2 percent rotenone) 
Check 
Natural cryolite 60 percent 
+ talc 40 percent (best 
control) 
Tomatoes 
Fruitworm 
Examined | 
Injured 
| Injured 
control 
Number 
Number 
Percent 
Percent 
6, 773 
1,080 
16.0 
5.9 
6,412 
1,087 
16.9 
.6 
6,675 
' 957 
14.3 
15.9 . 
18,149 
3,092 
17.0 

8,024 
287 
5,6 
78.8 
Heliothis a ssul ta Guon. 
Van der Laan ( 245 ) in 1938 reported that in laboratory experiments 
this species was only slightly affected by derris dust. 
Heliothis v irescens (F f ), the tobacco budworm 
Chamberlin and Madden (67) in 1937 reported that cube exerts only a 
very limited control, 
Laphygma exigua (Kbn. ), the beet armywprm 
One of the materials tested for the control of the asparagus cater- 
pillar was rotenone. Undiluted lead arsenate dust was the most effective 
of the materials tried. — Florida Agricultural Experiment Station ( 158 ) 
in 1934. 
Dusting or spraying with derris had only slight effect on this species 
Dusts containing 0.5 percent of rotenone killed 20 to 30 percent of the 
half- to noarly full-grown larvae. — Van der Vecht (454) in 1936. 
