Our Shade Trees And Their Insect Defoliators
Our Shade Trees And Their Insect Defoliators
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Hibernation. — The species hibernates normally in the egg state, but occasionally a living chrysalis may be found in winter time. On Janu- ary 30, 1874, we received from Mr. Hunter Nicholson, from Knoxville, Tenri., a newly- hatched female, and this had, no doubt, prematurely issued from a hibernating chrysalis. This is, however, quite exceptional,^ and the different climatic conditions to which the species is subjected in its wide distribution do not seem to alter the normal mode of hiberna- t...ion.
Number of Annual Generations, — In the latitude of Washington the species is two-brooded, the images of the first generation appearing in the first part of June, those of the second generation in September and October. On several occasions we have found, however, that a portion of the caterpillars from one and the same batch of eggs would be feed- ing while the rest had already transformed to imagos. The result of this retardation and irregularity in development is that caterpillars may be found continuously throughout the season from June till Octo- ber, and that there is, consequently, no distinct dividing line between the two generations.
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To quickly assess the difficulty of the text, read a short excerpt:
Hibernation. — The species hibernates normally in the egg state, but occasionally a living chrysalis may be found in winter time. On Janu- ary 30, 1874, we received from Mr. Hunter Nicholson, from Knoxville, Tenri., a newly- hatched female, and this had, no doubt, prematurely issued from a hibernating chrysalis. This is, however, quite exceptional,^ and the different climatic conditions to which the species is subjected in its wide distribution do not seem to alter the normal mode of hiberna- t...ion.
Number of Annual Generations, — In the latitude of Washington the species is two-brooded, the images of the first generation appearing in the first part of June, those of the second generation in September and October. On several occasions we have found, however, that a portion of the caterpillars from one and the same batch of eggs would be feed- ing while the rest had already transformed to imagos. The result of this retardation and irregularity in development is that caterpillars may be found continuously throughout the season from June till Octo- ber, and that there is, consequently, no distinct dividing line between the two generations.
What to read after Our Shade Trees And Their Insect Defoliators?
You can find similar books in the "Read Also" column, or choose other free books by Charles Valentine Riley to read onlineMoreLess
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