 | 1880 - 1104 páginas
...I have not been able to prove absolutely that there are two broods of the gall-making female;, and my observations all tend to the conclusion that no...obtaining galls either by enclosing the winged females ia inuslin bags tied on the living trees, or by similarly enclosing her immediate progeny, though 1... | |
 | Vermont Agricultural Experiment Station - 1888 - 676 páginas
...which when first born are enclosed in the usual delicate egg-like covering." Dr. Riley also thinks that " no galls are formed except by the stem-mother that hatches from the impregnated egg." As the same author remarks, there seems to l>ea step wanting between the third brood a7id the mouthless... | |
 | Vermont. State Board of Agriculture - 1890 - 408 páginas
..." I have not been able to prove absolutely that there are two broods of the gall-making female, and my observations all tend to the conclusion that no...have never succeeded in obtaining galls either by inclosing the winged females in muslin bags tied on the living trees or by similarly enclosing her... | |
 | United States Entomological Commission - 1890 - 1078 páginas
...moutbless. I have not been able to prove absolutely that there are two broods of the gall-making female, and my observations all tend to the conclusion that no...stem-mother that hatches from the impregnated egg. There is a link wanting between the third generation and the montbless sexual individuals, but I am... | |
 | United States Entomological Commission, Alpheus Spring Packard - 1890 - 1060 páginas
...monthless. I have not been able to prove absolutely that there are two broods of the gall-making female, and my observations all tend to the conclusion that no...stem-mother that hatches from the impregnated egg. There is a link wanting between the third generation and the monthless sexual individuals, but I am... | |
 | United States Entomological Commission, Alpheus Spring Packard - 1890 - 1058 páginas
...have not been able to prove absolutely that there are two broods of the gall-making female, and ray observations all tend to the conclusion that no galls...stem-mother that hatches from the impregnated egg. There is a link wanting between the third generation and the monthless sexual individuals, but I am... | |
 | Maine Agricultural Experiment Station - 1911 - 794 páginas
...eggs. I have not been able to prove absolutely that there are two broods of the gall-making female, and my observations all tend to the conclusion that no...similarly enclosing her immediate progeny, though I have succeeded in obtaining, without any difficulty, an abundance of galls by so enclosing the stemmother.... | |
 | Maine Agricultural Experiment Station - 1911 - 780 páginas
...eggs. I have not been able to prove absolutely that there are two broods of the gall-making female, and my observations all tend to the conclusion that no...formed except by the stem-mother that hatches from the impregnatedi egg. I have never succeeded in obtaining galls either by enclosing the winged females... | |
 | Ernest Ingersoll, William Cornelius Wyckoff - 1878 - 406 páginas
...generation all become winged: agreeing in this with the phylloxera that affect the hickory'. It is probable that no galls are formed •except by the stem-mother that hatches from the impregnated egg; as such succulent galls as these are produced on the tender young leaves only. Pemphigus populi-monilis,... | |
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... sexual individuals, the females of which so often perish while yet covering their solitary winter eggs. I have not been able to prove absolutely that there are two broods of the gall-making female, and my observations all tend to the conclusion that... 