Plant threat

Usage examples of aphis.

In fact, of the twenty rose-trees which formed the parterre, not one bore the mark of the slug, nor were there evidences anywhere of the clustering aphis which is so destructive to plants growing in a damp soil.

Ants, neuter, structure of Aphides attended by ants Aphis, development of Apteryx Arab horses Aralo-Caspian Sea Archiac, M.

Chapter VII Instinct Instincts comparable with habits, but different in their origin -- Instincts graduated -- Aphides and ants -- Instincts variable -- Domestic instincts, their origin -- Natural instincts of the cuckoo, ostrich, and parasitic bees -- Slave-making ants -- Hive-bee, its cell-making instinct - - Difficulties on the theory of the Natural Selection of instincts -- Neuter or sterile insects -- Summary.

One of the strongest instances of an animal apparently performing an action for the sole good of another, with which I am acquainted, is that of aphides voluntarily yielding their sweet excretion to ants: that they do so voluntarily, the following facts show.

I removed all the ants from a group of about a dozen aphides on a dock-plant, and prevented their attendance during several hours.

After this interval, I felt sure that the aphides would want to excrete.

Even the quite young aphides behaved in this manner, showing that the action was instinctive, and not the result of experience.

During the present year, however, in the month of July, I came across a community with an unusually large stock of slaves, and I observed a few slaves mingled with their masters leaving the nest, and marching along the same road to a tall Scotch-fir-tree, twenty-five yards distant, which they ascended together, probably in search of aphides or cocci.

Chapter VII Instinct Instincts comparable with habits, but different in their origin -- Instincts graduated -- Aphides and ants -- Instincts variable -- Domestic instincts, their origin -- Natural instincts of the cuckoo, ostrich, and parasitic bees -- Slave-making ants -- Hive-bee, its cell-making instinct - - Difficulties on the theory of the Natural Selection of instincts -- Neuter or sterile insects -- Summary.

Ants, neuter, structure of Aphides attended by ants Aphis, development of Apteryx Arab horses Aralo-Caspian Sea Archiac, M.

In fact, of the twenty rose-trees which formed the parterre, not one bore the mark of the slug, nor were there evidences anywhere of the clustering aphis which is so destructive to plants growing in a damp soil.

One of the strongest instances of an animal apparently performing an action for the sole good of another, with which I am acquainted, is that of aphides voluntarily yielding their sweet excretion to ants: that they do so voluntarily, the following facts show.

I removed all the ants from a group of about a dozen aphides on a dock-plant, and prevented their attendance during several hours.

After this interval, I felt sure that the aphides would want to excrete.

Even the quite young aphides behaved in this manner, showing that the action was instinctive, and not the result of experience.