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The powdered leaves of E. pe rfoliatum seemed obnoxious to cotton 
caterpillars, but an infusion had no effect on them.— Riley (325, p. 184) • 
Extracts of the leaves and stems of E. perfoliatum killed none of 
the mosquito larvae tested, — Hartzell and Wilcoxon ( 188 ) • 
GALINSOGA PARVIFLORA Cav. Galinsoga. 
A powder and a deooction had no effect on aphids ( Macrosiphum sp.) — 
Mclndoo and Sievers (259 , p. 22) • 
Extracts were not repellent to the Japanese beetle.— Metzger and 
Grant (277), 
GNAPHALIUM OBTUSIFOLIUM L. Sweet everlasting. 
GRINDELIA CAMPORUM Greene. Grindelia. 
Extracts were not repellent to the Japanese beetle .--Metzger and 
Grant (277). 
GRINDELIA sp. (probably robusta Nutt.) . Grindelia. 
Acetone extracts of the whole plant (N. F.) killed 65 percent of 
the mosquito larvae tested.- Hartzell and Wilcoxon ( 188 ) . 
HELENIUM AUTUMNALE L. Sneezeweed. 
HELENIUM TENTH FOLIUM Nutt. Bitterweed. 
The decoction, infusion, and alcoholic extraot did not affect 
cotton caterpillars.— Riley (325 , p. 184). 
The powdered heads of the bitterweed had only a slight effect on 
silkworms, flies, and aphids, and the decoction had no effect whatever 
on aphids .--Mclndoo and Sievers ( 259 , p. 22). 
HELENIUM sp. Yerba de la pulga. 
The Pan American Society of Tropical Research brought to this 
country nearly 3 million seeds of this plant. After extensive ex- 
periments the Society concluded that the plant possesses exceptional 
insect-repelling qualities, and not only contains but actually exudes 
sufficient quantities of rotenone to make a single growing specimen 
of the plant repellent to practically all forms of insect life in an 
area of some 15 to 20 square feet. — Anonymous (34). 
HELIANTHUS ANNUUS L. Common sunflower. 
