- S3 ~ 
A Method of Testing Oil Insecticides 
R. H, Smith (248) in 1358 described a microtechnique method of 
testing oil ihsectlcici es on scr.le insects. Thin involves placing the 
oil directly into the spiracle of the insect, cr upon any desired part 
of the body, and determining the effect by observation under the micro- 
scope. The me ■' has been employed with particular satisfaction in 
studies ritb hi hly refined oils fortified by the addition of pyreth.rur.ij 
rbtencne, and other substances to make the oils toxic. Its usefulness 
can probably be enlarged through the use of micromanipulating apparatus 
cf the type employed in the field 
biolo or. 
Ful^oridae 
S c ga ta fu re if era ( ho rv. ) 
Spraying with derr.is effected complete control of this insect 
attacking padi (rice) in "thq Federated Malay States, — Federated Malay 
States Department of Agriculture (100 ) ir 1937. 
Llembracidae 
Ceresa bubalus (F.), the buff a] 
lopper 
A dust containing 2 r 5 parts of derris (3,95 percent rotenone) and 
75 parts of gypsum was ineffective »~*Eelsall and Stultz (170) in 1937, 
Glossorxotus cr i 
f H 
; , a treehoppe: 
i 
i 
Hutson ( 158 ) i ' reported that nicotine, der,ri3j and pyre thrum 
dusts had no effect on adult treehoppersy 0. cfrataegij en plum and apple, 
St jo tc c ephala festina (Say), the three-cornered alfalfa hopper 
Cassidy and Barber, of the Division of Cotton Insect Investigations, 
Bureau of Entomology and Plant Quarantine, in 1935 reported that cube dust 
ve 80 percent control, derris dust (4 r • rotenone) C>5 -percent con- 
trol, and pyre thru >ercent control of this insect on cotton in Arizona, 
Tests re re made in cages in the field and also in lantern globes in the 
insectary* These results were cited by Loark (234) in 1930 in comparing 
insecticidal value of derris and cute. 
Membracidae (unidentified 
s i . • a i e s ) 
Bhatta and Narayanan (15) in 1937 reported the work done in Mysore, 
India, on the insecticidal value of plant fish poisons and 'other forest 
products and stated that an alcoholic extract of the seeds of Tephrosia 
Candida, at 1 percent concentration, controlled adults and nymphs of 
membracids on Qaianus ihdicus. 
