 | 1880 - عدد الصفحات: 1104
...structural differences from the first (see description), and are destined to become winged. During most of the month of May, we may find, where large...and those getting wings — interspersed with white exuvia-, cottony secretion, and globules of pearly liquid. At the same time, in single curls of more... | |
 | Vermont. State Board of Agriculture - 1890 - عدد الصفحات: 408
...first, but are developed as the insect becomes mature. Of these early generations Riley says : " During most of the month of May we may find, where large...every stage of development. As the lice increase in number the leaves no longer protect them, but present on both sides multitudes of busy atoms, livid... | |
 | Maine Agricultural Experiment Station - 1911 - عدد الصفحات: 794
...structural differences from the first (see description), and are destined to become winged. "During most of the month of May, we may find, where large...every stage of development. As the lice increase in number, the leaves no longer protect them but present on both sides multitudes of busy atoms — livid,... | |
 | Maine Agricultural Experiment Station - 1911 - عدد الصفحات: 780
...structural differences from the first (see description), and are destined to become winged. "During most of the month of May. we may find, where large...every stage of development. As the lice increase in number, the leaves no longer protect them but present on both sides multitudes of busy atoms — livid,... | |
| |
... around her, and in their turn commence to bring forth young, some remaining within the original curl, others scattering to found new colonies. Their issue, or the third generation, show certain marked structural differences from the first (see description),... 