- 15 - 
The maximum mortality (82 percent) of adults was given by a mixture 
of 10 parts of air- floating par is green and 90 parts of sulfur; the maxi- 
mum mortality (95.5 percent) of nymphs was _iven by a mixture of 40 parts 
of pyre thrum (pyrethrins 0.9 percent) and 60 parts of sulfur. 
Erring and i'cGarr (21) in 1937 reported results of insecticidal 
tests against the cotton flea hopper in 1935, 1934. and 1935 at Port 
Lavaca, Tex. Cotton flea hopper nymphs and adults -.."ere introduced into 
screen cages late in the afternoon of the day preceding the beginning of 
the experiment. The dust applications were made earl:;- in the mornings, 
usually shortly after sunrise. Powdered derris root and cube root, each 
containing approximately 4 percent of rotenone, were tried against the 
flea hopper. Neither of these materials showed any promise. The kill of 
adults from derris root was about 4 percent and of nymphs about 7 percent. 
The cube root gave a kill of 2 percent of adults and no kill of nymphs. 
Derris mixed with sulfur, 1 part to 4 parts by weight, gave a mortality 
of both nymphs and adults below that caused by straight sulfur. The mix- 
ture of clay with 4 percent of rotenone showed no kill. A mixture with 
50 percent of rotenone was then applied and still there was no kill of 
adults and only a 2-percent kill of nymphs. A mixture of sulfur with 
4 percent of rotenone also failed to show any benefit from the rotenone. 
Cube root mixed with phenothiazine failed to give promising results. 
Ragmus impor t unitas Dist. 
It is possible that this species on crotalaria may be controlled 
by dusts containing about 0.5 percent of rotenone. — Van der Vecht (90) 
in 1936. 
Pentatomidae 
A ero sternum hilare (Say), the green stinkbug 
Underhill (86) in 1934 reported that Derrisol gave poor results 
against green stinkbug nymphs in laboratory tests. In field tests against 
nymphs on bush lima beans Serrid Super Agricultural Spray killed 67 per- 
cent at the end of 24 hours when applied at 1:200. At the same dilution 
plus 0.5 percent of soap, the kill was 72 percent; plus 1 percent of soap 
the kills in 4 tests were 100, 78 ; 85, and 100 percent. At 1:400 with 
0.5 percent of scap this material killed 67, 65, and 93 percent of the 
nymphs in three tests; at 1:400 with 1 percent of soap the kill was 72 and 
81 percent in two tests. It was concluded that nymphs can be killed by 
using strong solutions of soap or mixtures of sprays containing soap and 
pyrethrin or soap and rotenone. i T cne of the combinations proved effective 
against the adults and eggs. 
Hau.de (42) in 1939 recommerded spraying the nymphs with cube or 
dorris (4 percent rotenone) at the rate of 4 pounds per 100 gallons of 
water plus a wetter. 
Agonoscelis rutila (F.), a red and black shield bug 
The New South Wales Entomological Branch (65) in 1955 suggested 
dusting with a mixture of 1 part of derris powder and 9 parts of talc by 
volume. 
