Forest Insect Conditions in British Columbia a Preliminary Survey
Forest Insect Conditions in British Columbia a Preliminary Survey
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The injuries to Engelmann's spruce and western larch will be discussed in later publications.
Twig-boring Bark-beetles and twig-girdling caterpillars are particularly common on the bull pine. Usually such injury is of little importance; but in places, numbers of trees were being killed in this way this summer. An inter- esting outbreak occurs between Okanagan Landing and Fairview.
The Pissodes Beetles, spruce and pine weevils, are abundant locally, destroying the terminal shoots of young growth.... No very serious outbreaks were located last summer.
11 Throughout the Okanagan and Similkameen many bull pines are stag- headed. All such cases examined had been caused by bark-boring caterpillars destroying the inner bark in patches about the trunk and bases of the branches, working downwards from the top. These dead tops were covered with resin, and perfectly sound.
Fig. 1 Galls of the Sitka Spruce Gall Aphis, on Sitka Spiuce: Stanley Park, Vancouver.
(Original. ) The cones of the bull pine and Douglas fir are frequently infested by boring caterpillars, which mine through the scales and axis and later destroy many of the seeds.
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To quickly assess the difficulty of the text, read a short excerpt:
The injuries to Engelmann's spruce and western larch will be discussed in later publications.
Twig-boring Bark-beetles and twig-girdling caterpillars are particularly common on the bull pine. Usually such injury is of little importance; but in places, numbers of trees were being killed in this way this summer. An inter- esting outbreak occurs between Okanagan Landing and Fairview.
The Pissodes Beetles, spruce and pine weevils, are abundant locally, destroying the terminal shoots of young growth.... No very serious outbreaks were located last summer.
11 Throughout the Okanagan and Similkameen many bull pines are stag- headed. All such cases examined had been caused by bark-boring caterpillars destroying the inner bark in patches about the trunk and bases of the branches, working downwards from the top. These dead tops were covered with resin, and perfectly sound.
Fig. 1 Galls of the Sitka Spruce Gall Aphis, on Sitka Spiuce: Stanley Park, Vancouver.
(Original. ) The cones of the bull pine and Douglas fir are frequently infested by boring caterpillars, which mine through the scales and axis and later destroy many of the seeds.
What to read after Forest Insect Conditions in British Columbia a Preliminary Survey?
You can find similar books in the "Read Also" column, or choose other free books by James Malcolm Swaine to read onlineMoreLess
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