Report On the Importation of Parasites And Predaceous Insects
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To quickly assess the difficulty of the text, read a short excerpt:
in the shade in Australia, the number of Orcus chalybeus upon each orange tree could be estimated, as all the beetles came down on the stems near the ground, which was a beautiful sight for an enthusiastic bug-hunter, and from 175 to 300 beetles were collected on each stem; but the larvae of the same upon the trees were probably ten times as many. It should be under- stood that these trees are never sprayed.
Some 1,500 difierent beneficial ladybirds are known at present in the world, and more t...han half of these will feed upon scale insects. We should do our best to import as many of these as possible, and at the same time guard against any new importations of coccids.
It is not that we should exterminate our scale insects — this is a mat- ter of impossibility even with the best of natural enemies or parasites, and would be contrary to nature; but we can, with the proper natural 12 REPORT ON PARASITES AND PREDACEOUS INSECTS.
enemies, keep these insects in check to such an extent that they will not injure our trees, and fruit growing will be possible for all time to oome.
What to read after Report On the Importation of Parasites And Predaceous Insects?
You can find similar books in the "Read Also" column, or choose other free books by California State Board of Horticulture to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
in the shade in Australia, the number of Orcus chalybeus upon each orange tree could be estimated, as all the beetles came down on the stems near the ground, which was a beautiful sight for an enthusiastic bug-hunter, and from 175 to 300 beetles were collected on each stem; but the larvae of the same upon the trees were probably ten times as many. It should be under- stood that these trees are never sprayed.
Some 1,500 difierent beneficial ladybirds are known at present in the world, and more t...han half of these will feed upon scale insects. We should do our best to import as many of these as possible, and at the same time guard against any new importations of coccids.
It is not that we should exterminate our scale insects — this is a mat- ter of impossibility even with the best of natural enemies or parasites, and would be contrary to nature; but we can, with the proper natural 12 REPORT ON PARASITES AND PREDACEOUS INSECTS.
enemies, keep these insects in check to such an extent that they will not injure our trees, and fruit growing will be possible for all time to oome.
What to read after Report On the Importation of Parasites And Predaceous Insects?
You can find similar books in the "Read Also" column, or choose other free books by California State Board of Horticulture to read onlineMoreLess
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