Page:Popular Science Monthly Volume 81.djvu/477

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471
MODERN WARFARE AGAINST GRASSHOPPERS

from 24 to 36 hours for the insects to die after partaking of the poison, a partial paralysis was the result, and no food was taken by the afflicted animal after his poisoned meal. We applied this by means of large field sprayers, the spray covering 23 lineal feet of ground at once, though the ordinary potato sprayers could also be used. Generally speaking about fifty gallons will cover an acre, and the cost per acre, exclusive of labor, is about 30c. This figure would, of course, be influenced to a greater or less extent by the location of the water supply. A tank wagon in the field would naturally lessen waste of time in this connection. The question as to the effect of this poisoned forage upon stock naturally presents itself at this point, and we have reason to say

PSM V81 D477 Another view of the spraying outfit.png

Fig. 11. Another View of Our Spraying Outfit.

that, as used by us, there appears to be no danger from this source. Of course, unrestricted feeding upon grass drenched with a poison spray on the part of animals, forced to use such feed, and allowed no other forage, might, and probably would, have bad results, but in ordinary practice, as applied in a grasshopper campaign in North America, such conditions would not present themselves, albeit the farmer must bear in mind that he is handling an internal poison, cumulative in effect, the partaking of which in large quantities would probably mean death to any animal.

To be more explicit, the above opinion is based upon several experiments we have tried personally at the Minnesota Experiment Station, the following, and last, constituting sufficient proof to warrant the statement. A yearling heifer was placed in an enclosed plot containing