-77- 
A spray of 1 pound of derris or cube (4 percent of rotenone) 
in 25 gallons of water with a suitable spreader was effective against 
aphids and thrips .— Turner (596) * 
Worlc on aphids in Maine showed that aphid infestations can be 
greatly reduced by applications of rotenone-soybean oil and nico- 
tine-rotenone sprays.— TJ. S. Bureau of Entomology and Plant Quarantine 
(628 , p. 136). 
Cercopidae 
Clastoptera saint-cyri Prov., a cranberry spittle insect 
A considerable infestation of the adults in Massachusetts was 
completely wiped out by dusting with 100 pounds of derris (4 percent 
of rotenone) per acre without an activator or wetter.— Franklin (193 ) . 
Philaenus leucophthalmus (L.) ( "apumarius L.), a spittle bug on straw- 
berry 
The use of a 0.5-percent rotenone dust proved satisfactory in 
Washington. A 3-percent nicotine dust gave good control but was 
less satisfactory.— Hanson and Webster (260, p. 37). 
One of the important use of rotenone is to control spittle bugs 
on strawberries.— Howard and ooworkers (294 , p. 31). 
Ch ermidae 
Pineus pineoides Cholodk, ( Chermes (P) p. Cholodk.) 
A derris dust gave unsatisfactory control of this aphid on spruce 
in Switzerland. — Schneider-Orelli (523) . 
Cicadellidae 
Aoeratagallia sanguinolenta (Prov.), a clover leafhopper 
The greatest kill obtained with derris was 52 percent at a con- 
centration equivalent to 16 pounds of 5-percent rotenone per 100 
gallons, whereas 100 percent kill with pyrethrum was obtained at a 
concentration equivalent to 4 pounds of ground flowers containing 
0.5-percent of pyrethrins per 100 gallons.— Watkins (655). 
Bythoscopus cedaranus Naude, a wattle jassia 
Laboratory experiments showed that pyrethrum dust was superior 
to derris in the Union of South Africa. — Evans (170). 
