- 21 - 
instars; and at 900 gin, plus 750 gm. of soap it killed 94.1 percent of 
the fifth instars. Another agricultural experimert station in Japan 
reported that 55.3 percent of the adults were killed by 1 pound of TIeoton 
in 80 imperial gallons cf v/ater, and 86.6 nercent were killed by twice 
this concentration. 
Rhoecocoris sulciveiitris (Stal), a bronze orange bug 
The Queensland Department of Agriculture (72_) in 1923 reported 
tests to control the bronze orange bug on citrus trees at llontville, 
Australia. Salomia (10 ounces plus Derrisene, 1 ounce, ir 2 imperial 
gallons of water) and Katalcilla (4 ounces, in 2 imperial gallons of 
•water) were unsatisfactory, and the addition of resin as a sticker did 
not materially add to their value. 
Hely (40) in 1938 reported on the control cf the bronze orange 
bug which is a f -miliar pest ir citrus orchards in parts of the Forth 
Coast o£ New South Wales and in Queensland, and causes considerable con- 
cern also in the ^ocrlar.d and surrounding districts in some seasons. 
The earlier attempts to destroy late-stage bugs with nicotine and pyre thrum, 
extracts were not successful, though derris in dust form showed some 
promise. Later trials with derris and pyrethrum solutions indicated that 
further work with these materials was justified and, as a result of tests 
conducted in ITcvember 1P37, it xvas found that either cube po-.vder or ground 
derris root at the rate of 1 pound to 40 imperial gallons of v/ater with 
soft soap at the rate of 1.5 pounds to 40 imperial gallons gave an 
excellent kill of all stages present, including adults. Bugs in the 
secord, third, and fourth instars appeared most susceptible, while those 
in the late fifth instar just before changing into adults were the most 
resistant. Applications should therefore be mads when injury begins to 
become apparent in the spring, when few fifth instars are present. 
In preparation of the sprays the soft soap is dissolved in hot 
water and then the derris or cube powder is stirred into the soap 
solution. This mixture is then added to the water in the spray tank 
and the Thole kept well agitated during the spra; ing, Pyrethrum at the 
rates of 1 pound to 20 gallons and 1 pound to 40 gallons had the effect 
of droppin;; some cf the bugs, but many of them recovered, though at 
first they verc stupefied. 
Scoixinophara ccarctata (F.) 
I F.alay States Department of Agriculture (22_) in 1920 
reported that in Fc-rak, durin October and hovcmbcr, experiments v. r cre 
conducted on the centre] o' Bona Kura ( Pod ps)Scoti nop] ra ccarctata F. , 
a medium-sized brovm bug. Sorry: - :erosen md with 
extract of tuba root (Derris sp.) v.r.r tried. The r suits were uncertain. 
Corbctt and Yusope (14) in 1' 24 stated t at ... s ray of tuba root 
has a marked killing effect c bh various stages, but since the quantity 
required would mane 'z]\c operation - ; too costly, unless derris 
plants were grevn by the cultivators, this of combating the insect 
