22 BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 



A water extract from the dried leaves and seeds of the American 

 wormseed {Chenopodium ambrosioides) had no effect on bees. A 

 strong decoction, mixed with soap, from the leaves, stems, and seeds 

 had no effect on potato aphicls and nasturtium aphids. The powder, 

 used as a dust, had no effect on tent caterpillars, but a considerable 

 effect on roaches; and used as a stomach poison, it had no effect on 

 grasshoppers. 



The powder and hot-water extract from the flower heads of the 

 oxeye daisy {Chrysanthemum leucanthemum) had no effect on silk- 

 worms, webworms, potato-beetle larvae, and rose aphids. 



The powder from Clibadium surinamense had practically no effect 

 on silkworms. 



A hot-water extract of the stems of a fish-poison (Cracca villosa 

 'purpurea) had no effect on tent caterpillars. 



Cold-water extracts from the tops of Scotch broom {Oytisus scopa- 

 rius), collected in two different localities, had practically no effect 

 on silkworms. Since this plant is reported to contain sparteine, a 

 0.5 per cent solution of sparteine sulphate was fed to silkworms. 

 This solution proved efficient, but acted very slowly. 



A water extract of jimsonweed {Dahira stramonium) had no 

 effect against small webworms and small catalpa caterpillars, and a 

 highly concentrated water extract had only a slight effect on bees. 

 The water extract, used as a fumigant, had no effect on small web- 

 worms. The powder, used as a stomach poison, had a slight effect on 

 silkworms; and used as a dust, it had a slight effect on roaches and 

 tent caterpillars. 



Powders from the roots, leaves, and stems, and from the blossoms 

 of low larkspur {Delphinium bicolor) , and hot-water extracts from 

 all of these powders had no effect on webworms, silkworms, grasshop- 

 pers, and potato-beetle larvae, with one exception ; the extract from 

 the blossoms had a slight effect on silkworms. 



A water extract from Euphorbia cotinoides had a considerable 

 effect on silkworms. 



A water extract from Furcraea cubensis had practically no effect 

 on silkworms. 



A powder and a decoction from galinsoga {Galinsoga parviflora) 

 had no effect on the aphids {M acrosiphum sp. B) tested. 



The juice from the green leaves of the Kentucky coffeetree {Gym- 

 nocladus dioica), mixed separately with sugar sirup, molasses, and 

 honey, had no apparent effect on the many flies tested. 



The powder from the heads of the bitterweed {Helenium tenuifo- 

 lium) had only a very slight effect on silkworms, flies, and aphids 

 {Aphis spp. A and B), but the decoction had no effect whatever 

 on aphids of the same species. 



A water extract from a Honduras fish-poison (see footnote on p. 

 26) was efficient against silkworms. 



A powder from Jatropha macrorhiza, used as a dust, had a slight 

 effect on tent caterpillars and roaches. 



The powder from lambkill {Kalmia a.ngusti folia) , eaten by grass- 

 hoppers and dusted upon bees, had no effect. 



The powder and a water extract from margarita {Karwinskia 

 humboldtiana) were efficient but very slow against silkworms, 

 although they had no effect on tulip-tree aphids. The powder had 



