Report On the Injurious Insects And Other Animals Observed in the Midland Counti
Report On the Injurious Insects And Other Animals Observed in the Midland Counti
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The woolly-aphis sucking the juices, from the roots of the apple tree causes an abnormal gro\vth of the attacked portion of the roots, resulting in the formation of gall-like swellings or excresences.
These swellings are usually irregular and knotty in appearance, and sometimes attain considerable size, while that portion of the roots between the excresences is frequently undeveloped.
The woolly-aphis will be found in large numbers, and in clusters, over the surface swellings, and especially be...tween them in the numerous crevices that the larger excresences contain. The roots thus attacked, distorted and swollen, soon begin to decompose ; saprophytic fungi and bacteria enter the dead and decaying portions and help to hasten the work, and soon that portion of the root perishes. Sometimes the root seems to be killed outright by the vast number of aphis sucking the sap and causing the abnormal growth ; so that the attacked portion perishes before decomposition has fairly set in. But in either case the aphids perish, or leave the dead root and seek living roots upon which they can feed ; and hence, when one examines a root that has been dead for only a short time even, the aphis may not be found there, and this has led many to attribute the death of the root to other causes, especially to ' root-rot.
What to read after Report On the Injurious Insects And Other Animals Observed in the Midland Counti?
You can find similar books in the "Read Also" column, or choose other free books by Walter Edward Collinge to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The woolly-aphis sucking the juices, from the roots of the apple tree causes an abnormal gro\vth of the attacked portion of the roots, resulting in the formation of gall-like swellings or excresences.
These swellings are usually irregular and knotty in appearance, and sometimes attain considerable size, while that portion of the roots between the excresences is frequently undeveloped.
The woolly-aphis will be found in large numbers, and in clusters, over the surface swellings, and especially be...tween them in the numerous crevices that the larger excresences contain. The roots thus attacked, distorted and swollen, soon begin to decompose ; saprophytic fungi and bacteria enter the dead and decaying portions and help to hasten the work, and soon that portion of the root perishes. Sometimes the root seems to be killed outright by the vast number of aphis sucking the sap and causing the abnormal growth ; so that the attacked portion perishes before decomposition has fairly set in. But in either case the aphids perish, or leave the dead root and seek living roots upon which they can feed ; and hence, when one examines a root that has been dead for only a short time even, the aphis may not be found there, and this has led many to attribute the death of the root to other causes, especially to ' root-rot.
What to read after Report On the Injurious Insects And Other Animals Observed in the Midland Counti?
You can find similar books in the "Read Also" column, or choose other free books by Walter Edward Collinge to read onlineMoreLess
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