anaheim-gazette 1908-12-03
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TO PREVENT GUM DISEASE
A QUESTION OF IMPORTANCE TO CALIFORNIA GROWERS
Bulletin of the Agricultural Experiment Station Dealing With Various Troubles of Citrus Trees Included in Category of Gum Disease
We have been favored with a copy of a bulletin upon the Gum Disease of Citrus Trees in California, issued by the agricultural experiment station at Berkeley. The bulletin is by Ralph E. Smith and O. Butler. We quote from it as follows:
The most common and characteristic citrus tree diseases in California are those which may be included under the general term "Gum Disease." Although the troubles which we shall consider are known locally under a variety of names, they all have the one feature in common of an abnormal production of tree gum from the affected parts, and so may be included in the same category. As we shall show at the proper time, this characteristic of gumming is not the only one common to these various troubles.
To a certain extent the various forms of gum disease are serious, and yet they are by no means disastrous; their nature is in a sense unknown, and yet for practical purposes fairly well understood; their control is often difficult and by no means generally accomplished, yet almost always successfully attained when taken in time by proper means, when conditions impossible of improvement are not present. In short, gum disease is one of those conditions which require careful continued, intelligent work along various simple
the sap passes through certain paratively large tubular pores in the wood, which are for this purpose. Citrus trees particularly quick to respond to application of water to the sending large amounts up the trunk very soon after the cation is made.
While the root is engaged sorbing and pumping up water, mineral salts, the leaves are actively active in doing their part nutrition of the tree. During light the leaves constantly carbon dioxide gas from the soil by a remarkable activity which possesses, they decompose this and unite its carbon with the gen and oxygen derived from ter furnished by the roots, starch. In this way the green of plants accumulate large amount of starch during the daytime charged with this substance evening comes.
Starch being a solid material is necessary that it be made before it can pass out of the es or be further utilized by the process takes place in same manner as in animals, by the action of the substan ed diastase, which converts into sugar and thus makes it in water. Further changes of complicated nature then go on nutritive materials, through combination is effected of the materials obtained respectively roots and leaves, forming solu stances of a nutritive nature.
During these changes most water taken up by the roots ried up to the leaves, and thecess constantly goes on, even tallest trees. A constant and ant flow of crude sap takes passing through the outer la
their nature is in a sense unknown,
and yet for practical purposes fairly well understood; their control is often difficult and by no means generally accomplished, yet almost always successfully attained when taken in time by proper means, when conditions impossible of improvement are not present. In short, gum disease is one of those conditions which require careful continued, intelligent work along various simple lines for successful handling, rather than something of a strikingly specific nature with quick evidences of action and effect. It is also easier of prevention than of cure.
The present bulletin will consider the various citrus troubles which may be included in the category of gum diseases, showing the features which they have in common and discussing their nature, together with methods of prevention and cure. Since the founding of a laboratory of plant pathology in Southern California opportunity has been afforded for a thorough study of the gum disease problem in the field and laboratory under the most favorable conditions. At the same time many growers and other interested persons have been experimenting in a variety of ways in the practical treatment of the disease, so that a considerable fund of information is available, based on the experiences of others. This is freely drawn upon in the present bulletin.
From our own field work and the observations of others, taken in connection with the laboratory study which we have made, we feel ready to speak with a considerable degree of certainty upon the subject. Further studies are still desirable and are being carried on from the standpoint of advanced plant physiology and pathology as to the exact nature of the influences and processes which bring about the characteristic effects of gum disease.
This account of gum disease is based on the belief that no parasitic or infectious organism is primarily concerned in causing the trouble, but that the various forms of the disease are the result of physiological disturbances in the functions of the tree. A clear understanding of the nutritive materials, through combination is effected of the materials obtained respectively for roots and leaves, forming soluble substances of a nutritive nature.
During these changes most water taken up by the roots rerled up to the leaves, and thecess constantly goes on, even tallest trees. A constant andiant flow of crude sap takes passing through the outer layer wood, as previously described, ing and subdividing into the branches and twigs, and finally ching the leaves. At the same all parts of the tree absorb less of the soil water, by its ment in all directions, sufficient prevent wilting and drying o
After the nutritive material been properly prepared as de above, it is distributed again parts of the plant, in the form solution in water. This distr takes place mainly by a current through the inner bark, and we have in the trunk, to a extent, two currents of sap in opposite directions, one go ward through the wood, carry crude food material, and then coming downward through the bark, furnishing digested nut for the growth and nutrition tree. The latter process, he does not consist in an abundance of sap traveling rapidly in one tion, but is rather a slow process absorption and diffusion of the lishing materials.
Just between the bark and w situated the most vital part tree, the cambium layer, whi the seat of growth in this area, consisting of a narrow er of tissue running around tha and all the branches just by the wood and the bark, grows out with the expansion tree, forming the elements o wood on its inner side and tha the bark on the outer side. cambium goes, therefore, much digested food material, and it i in the formation of the tissues lioned, just as the blood in life conveys nutritive matter forization in the growth and m ance of the various tissues body.
This account of gum disease is based on the belief that no parasitic or infectious organism is primarily concerned in causing the trouble, but that the various forms of the disease are the result of physiological disturbances in the functions of the tree. A clear understanding of the principles of plant physiology and structure is therefore necessary to a proper conception of the nature of the disease.
The citrus tree, like other similar plants, consists of certain parts, of which the most important in the present connection are the root, stem and branches, and the leaves.
The root is the organ of absorption of water and mineral food elements, and likewise acts mechanically in holding the plant in the soil. It subdivides extensively, resolving at its extremities into the finest hairlike branches and outgrowths. Through the root is obtained water from the soil, with nitrates, phosphates, potash, iron, lime, etc., in solution, by a process of absorption. All the water used by the tree is obtained in this way from the soil.
This watery solution or crude sap passes into the woody portion of the root and thence travels up into the trunk, the stream being located mainly in the younger, outer part of the wood or sap-wood. There is no rapid flowing along of this water up into the tree from the root, like the blood circulation of animals. The current is a considerable one, however, particularly in the citrus tree, and grows out with the expansion of the tree, forming the elements of wood on its inner side and then the bark on the outer side. Camblum goes, therefore, much digested food material, and it is in the formation of the tissue formed, just as the blood in life conveys nutritive matter forization in the growth and maintenance of the various tissues of body.
Gum disease or Gummosis occurs is a term applied to a condition which an exudation of gums takes place through the bark. A flow of gum may be accompanied by other symptoms more or less pronounced, and is almost always connected with a dying or unhealthy condition of the tree. In other cases, the gumming is a symptom of or disease and not a normal condition. Such troubles are characteristic of two classes of citrus and stone fruits. Gum in the cherry, peach, plum or cot is even more common than orange or lemon.
The production of gum in trees has been held by some orities to be always caused by mechanical injuries. Cases where ming occurs and no injury can found they attribute to some er injury, the effects of which have evidently only after the wound has disappeared, or to an injured at some distance from the where the gumming occurs. Evident that injuries often do increase by a plentiful water at the roots; but that the lax excess, or some other physiol
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BACK AGAIN FROM E
By the solicitation of many
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Dr. H. EHRH
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Eye, Ear, Nose and Throat
From Berlin, Germany, will next visit to
Anaheim, Monday, D.
Commercial Hotel, 8 a.m.
One Day Only,
And return once a month.
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Do you want those Weak, Watery, Dim Eyes and consult Dr. Ehrlich this trip nothing to get his ophilon.
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disturbance, may actually cause as well as accelerate gumming is not so generally recognized. That such is the case, however, can scarcely be doubted from California experience.
In the sour-sap disease of stone fruits, for instance, supposedly caused by a sudden change from vigorous, unseasonably early activity to a period of dormancy produced by the occurrence of cold, rainy weather, abundant gumming occurs on the affected trees or branches. Gum pockets are often formed on cherry trees in wet spring weather on sound, anljured branches. In the peach profuse gumming occurs in wet weather on twigs affected by the blight fungus
Dr. H. EHRLICH.
CATARRH in any form of the THROAT, STOMACH, BOWTIE DEAFNESS POSITIVELY by a New Treatment and New Method by myself. It is the most Wonderful of this age on Lung, Nose and Ear Diseases of the Eyes, in Lids, Granulated, the most stupefessibly given up by other Doctors positively with my new method. Lens and Optic Nerve cured speedily by knife or injurious caustics, and patiess with Impunity. Weak Watery Eyes, Eyelids, Wild Halrs, Astigmatism, Near and all Eye Strains cured. Glasses all others fall.
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Read what the people have to say. Not satisfy you, come and see me; refer you to over 5,000 cured by them are doctors, lawyers, bankers, bakers and workingmen; and if you can find these that say they ever had or saw treatment I used, I will treat you freely.
If you are coming, come early, and are always crowded.
but in the same tree gum is common effect when injured seasonably warm winter wi other effects not of a parasitical nature.
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away their glasses and are able to
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