. New elementary agriculture for rural and graded schools; an elementary text book dealing with the plants, insects, birds, weather, and animals of the farm . harmful insects are more thanordinarily numerous they damage crops. At such timesit is often best for us to help their natural enemies inkilling them off. When we at-tempt this we must do it in differ-ent ways for different kinds ofinsects. Some we can kill by har-rowing the ground or by the useof heavy rollers for running overand crushing them. Others canbe killed by sprayingtheir food-plants withpoisons which theywill eat and be de-str
. New elementary agriculture for rural and graded schools; an elementary text book dealing with the plants, insects, birds, weather, and animals of the farm . harmful insects are more thanordinarily numerous they damage crops. At such timesit is often best for us to help their natural enemies inkilling them off. When we at-tempt this we must do it in differ-ent ways for different kinds ofinsects. Some we can kill by har-rowing the ground or by the useof heavy rollers for running overand crushing them. Others canbe killed by sprayingtheir food-plants withpoisons which theywill eat and be de-stroyed. Still othersmay be reduced innumbers by sprayingwith substances thatwould kill by coming, in contact with small gardens wecan pick them byhand, and later burnor crush them. Still others may be killed by poison-ous fumes or gases. Fires in stubble fields, on theprairie, and about old weed patches may be resorted tofor killing certain others, while torches fastened to stickswill reach caterpillars in trees, as already suggested onanother page. Some insects, as for example those with suckingmouth parts, must be killed by the use of kerosene. Fig. 98 NEW ELEMENTARY AGRICULTURE emulsion, or a mixture of coal oil and water, or bysome other similar substance that will kill from theoutside. But these mixtures must not be too strong orthey will kill the plants also. They can be sprinkled onthe bugs with spray pumps of different kinds. For the names of these mixtures and learning howthey can be made, you had better write to the bug-man at the State University, who will gladly tell youwhat you wish to know. In the mean while try to findout all you can about how the different kinds of insectslive, and what their natural enemies are. Spiders and Mites.—As a rule the life histories ofmost of our spiders are such as to make them the web-makers and those that live in holes catchdifferent kinds of insects upon which they feed. Theweb-makers especially destroy large n
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectagriculture, bookyear
