as CoLOEADO Experiment Station 
4. Milkweed seeds are able to germinate as soon as they 
burst from the pod, and if kept under dry conditions, will retain 
their vitality unimpaired for at least a year. 
5. Poisoning occurs under any condition in which hungry 
stock come in contact with the milkweed when there is a scarcity 
of other forage. This may occur (1) along driveways, (2) in 
overgrazed pastures, (3) in old orchards, (4) when milkweed oc- 
curs in the hay. 
6. The only sure method of preventing poisoning is to keep 
hungry animals from coming in contact with the milkweed. As a 
beginning, the stock ov/ner should first learn to recognize the 
poisonous milkweed. 
7. The experimental work has demonstrated: (1) 
Asclepias galioides is not only a very dangerous poisonous plant, 
but it is one of the most persistent weeds that we have, rank- 
ing with bindweed and poverty weed in this respect. (2) Early 
summer work and surface work are equally ineffective. (3) Sum- 
mer fallowing, followed by a hoed crop, was ineffective. (4) 
Three applications during a drv summer, of 10 pounds of salt in 
5 gallons of water to a plot 10 feet in diameter did not kill the 
plant in 1918, but prevented its appearance in 1919. (5) The best 
time to begin eradication measures is as late as possible in the 
summer before the ripening of the seed. (6) For small patches, 
a grub hoe properly used is effective. The best method is to be- 
gin at one side and dig a trench and then “move the trench” 
across the patch. This first treatment should be just before seed- 
ing, usually early in August, and should be followed by another 
grubbing when green shoots appear in September. (7) For larg- 
er patches thorough plowing at the time given above for the 
grubbing has given good results. (8) In every case best results 
were obtained on plots where the grubbing or plowing was fol- 
lowed by a heavy smother crop. In Colorado, winter wheat is prob- 
ably the best crop for this purpose. 
