Field Experiments And Observations On Insects Injurious to Indian Corn
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May i, root-lice nearly full grown, together with many young, were taken from roots of smartweed and ragweed (Ambrosia) in that part of the field sown to oats this spring but in corn for three year preceding. Two hundred oats plants were examined on and near the nests of ants containing root-lice, but not a louse was found upon them. Here again smartweeds near the nests of ants were withered and the roots were dead or actually gone. Cavities and gangways had been made by the ants beside the roo...ts of these weeds. The first root-louse of the second generation was seen in the field 116 BULLETIN No. 104. [October, May 3, although the eggs of the preceding year were not yet all hatched.
At this time an interesting and important comparison was made between the contents of ants' nests in fields of corn last year and those on which a single crop of oats had been raised. Every nest of the former contained numerous root-lice or their eggs, while thir- teen nests of Lasius alienus found in the oats field in corn for the three preceding years were carefully explored, but not an aphis could be found in the possession of the ants.
What to read after Field Experiments And Observations On Insects Injurious to Indian Corn?
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To quickly assess the difficulty of the text, read a short excerpt:
May i, root-lice nearly full grown, together with many young, were taken from roots of smartweed and ragweed (Ambrosia) in that part of the field sown to oats this spring but in corn for three year preceding. Two hundred oats plants were examined on and near the nests of ants containing root-lice, but not a louse was found upon them. Here again smartweeds near the nests of ants were withered and the roots were dead or actually gone. Cavities and gangways had been made by the ants beside the roo...ts of these weeds. The first root-louse of the second generation was seen in the field 116 BULLETIN No. 104. [October, May 3, although the eggs of the preceding year were not yet all hatched.
At this time an interesting and important comparison was made between the contents of ants' nests in fields of corn last year and those on which a single crop of oats had been raised. Every nest of the former contained numerous root-lice or their eggs, while thir- teen nests of Lasius alienus found in the oats field in corn for the three preceding years were carefully explored, but not an aphis could be found in the possession of the ants.
What to read after Field Experiments And Observations On Insects Injurious to Indian Corn?
You can find similar books in the "Read Also" column, or choose other free books by Stephen Alfred Forbes to read onlineMoreLess
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