An introduction to agriculture . 196 A:^^ INTEODUCTIOX to AGRICtTLTUEE root. Apple trees should be planted from 30 to 35 feetapart. Some of the most troublesome insects affecting theapple tree are the codling moth or apple worm, thecurculio and scale insects. The two former can be con-trolled by spraying with arsenate of lead, just at the.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear