PROTECTION AGAINST TRESPASS, FOREST INSECTS, EROSION AND OTHER AGENCIES
While the protection of the Forest resources from fire is probably the most important phase of forest protection, it is not the only one by any means. The National Forest force also protects the Forest resources from trespass, from insect damages, and from tree diseases. Also water supply for domestic use, for irrigation, water-power, and navigation must be protected, and the public health must be safeguarded against the pollution of the streams emerging from the Forests. It is also the duty of Forest officers, in coöperation with the state authorities, to protect game, fish, and birds from illegal practices.
Trespass. The Act of June 4, 1897, authorizes the Secretary of Agriculture to make rules and regulations for the occupancy, use and protection of the National Forests, and provides that any violation of such rules and regulations shall be punishable by a fine or imprisonment or both. This and later acts provide for fines or imprisonment for all violations of the regulations governing National Forests. The violation of these regulations constitutes trespass, and these may be either fire, timber, grazing, occupancy or property trespass, depending upon the offense. Since the United States has all the civil rights and remedies for trespass possessed by private individuals, it may bring action to recover damages resulting from trespass or breach of contract.
Fire trespass includes the following offenses: setting fire to timber, brush or grass; building camp fires in dangerous places where they are hard to extinguish; or leaving camp fires without completely extinguishing them. The various railroads that cross the National Forests are one of the most frequent offenders in that the sparks issuing from the locomotives or the hot ashes dropping from the fire box set fire to National Forest timber. The railroads are required to use every precaution to prevent such fires, but many of them are started, resulting in damage suits by the Government. The damages cover not only the merchantable timber and forage destroyed, but damages are also collected for young, immature growth, which at first thought might seem to have little or no value. But the courts have held that while the young, unmerchantable trees have very little value now, they have a great value as the basis for a future crop of timber. Thus, in the case of the United States versus the Chicago, Burlington and Quincy Railroad, in 1910, for fire trespass on the Black Hills National Forest, caused by sparks from the locomotives operated by the company, the damages included $17,900 for young growth. Also, in the case of the United States versus the Great Northern Railroad, in 1911, in which suit was brought upon the negligence (causing fires to start) of the defendant company on their right-of-way, which fires subsequently spread to the Blackfeet National Forest, damages included the destruction of a great many immature trees, the value of which was estimated on the basis of their value at maturity discounted to date. It is significant that this case never went to trial; the defendant paid damages and costs without argument.
Figure 46. A few years ago this was a green, luxuriant forest. Picture taken after the great fires of August 20, 1910, on the Coeur d'Alene National Forest near Wallace, Idaho
Under timber trespass are included the following acts: the cutting, killing, girdling, or otherwise damaging trees; the cutting of timber under sale contract or permit before it is marked by a Forest officer; the removal of timber before it is scaled, measured, or counted by a Forest officer; and the fraudulent stamping of any timber belonging to the United States with the regulation marking tools or similar device. Under grazing trespass are included such acts as: grazing stock on National Forest lands without permit; grazing stock on areas which are designated as closed to grazing; driving stock across a National Forest without permit; and refusal to remove stock upon instructions from an authorized Forest officer when an injury is being done to the National Forests by reason of the improper handling of the stock. The use of National Forest land without a permit for any purpose for which special use permits are required constitutes occupancy trespass. But traveling, temporary camping, hunting, surveying, or prospecting may be carried on without permit, and camp wood and forage for stock used in connection with such activities may be taken free of charge. The unauthorized appropriation, damage, or destruction of property belonging to the United States, which is used in the administration of the National Forests, also constitutes trespass.
Innocent trespass is usually settled amicably between the trespasser and the Supervisor. If the violation of the timber, grazing, or land regulations was due to a misunderstanding and was not of a willful character, a permit is issued and the trespasser pays for the timber or special use, as under regulation. Fire and property trespass cases seldom can be construed as innocent, hence in most cases such offenses result in litigation.
Forest Insects. Protection against forest insects is carried out in coöperation with the Bureau of Entomology of the Department of Agriculture.
An essential part of good forest protection is the work of locating and reporting evidences of insect depredations. There are scores of insects which are constantly working in the forests, either injuring or killing live trees or attacking the wood of trees after they have been killed. Weevils kill young shoots on trees and destroy tree seeds; bark beetles and timber beetles infest the bark, girdle the tree and destroy the wood; and various borers and timber worms attack seasoned and unseasoned forest products and destroy the wood in the forest after it has been cut down and sawed into lumber. The greatest annual loss by insects is caused not so much by conspicuous local outbreaks as in the sustained annual loss of scattered merchantable trees. Local infestations often kill a large percentage of trees on an area, but these outbreaks are easily seen; the scattered infestations that kill a tree or two here and there over large forest areas are not so noticeable, but, taken all together, add up to a startling total.
The task of locating and reporting insect infestations falls upon the Forest Ranger and other field men of the Forest Service. Since the Rangers are practically the only class of Forest officers that visit all parts of a National Forest during each field season, the Supervisor relies mostly on them to report upon insect infestations. In riding to and from his work, while on fire patrol, while going for mail and supplies, while attending to the timber, grazing and other business of his district, the Ranger does a good deal of traveling and covers practically every part of his district. These are good opportunities to watch for fresh outbreaks of insects, and the wide-awake, progressive Ranger never misses such chances. If he sees reddish-brown masses of pitch and sawdust on the bark of a tree he immediately recognizes it as the work of insects. Or perhaps he may see a pine or a spruce tree with all its needles turned yellow. He knows then that this tree was girdled by bark beetles very recently, probably during the previous summer. A tree whose needles had turned red would indicate to him that the infestation was more than a year old, since trees attacked in the spring of one year usually do not show the results until the following summer. These two stages are known by the trained entomologist as the "yellow-top" and the "red-top" stages respectively. The latter is followed by the "black-top" stage. In this stage, insect infested trees stand out very conspicuously as leafless, gray or black snags, and they tell the story of the work of bark beetles that happened years ago.
Figure 47. The first evidence of insect attack are the reddish brown pitch tubes on the bark. Lodgepole pine infested by the mountain pine beetle. Lassen National Forest, California. Photo by the author.
Figure 48. The last stage of an insect-attacked tree. The tree is dead and the dry bark is falling off. Lassen National Forest, California. Photo by the author.
Probably the first external evidence of the attack of a bark beetle upon living trees with normal green foliage, is the presence of pitch tubes upon the outer bark. These are small, reddish-brown (later becoming grayish-white) masses of pitch and sawdust, which exude from the small cylindrical entrance made by the adult beetle where it bores through the bark to begin its egg tunnel. Each tube represents the entrance of one or more of these beetles. But we must follow these egg tunnels further, to learn how the actual damage is done to the tree. As soon as the bark beetle has made its entrance through the bark, it starts to work up through the live bark and cambium of the tree, forming a tunnel but little larger than the diameter of the beetle, which is known as the egg gallery, These egg galleries vary in shape from straight to winding, and in length from ten to forty inches. As a rule, male and female beetles work together in one gallery, and the eggs are deposited along the sides of the gallery, often in little pockets. When the tunneling and egg-laying process of the adult beetles is completed, their activity ceases, and they are usually found dead at the upper end of their galleries. The larvæ hatch and begin their work by burrowing across the cambium at right angles to the egg galleries. The complete girdling of the cambium layer is not accomplished until the larvæ have completed their work, and the numerous larval galleries, by joining one another, form a complete gallery around the cambium of the tree, thus cutting off the food supply which is made in the leaves of the tree, from the lower portion of the tree, namely the roots. Since the roots cannot live without nourishment, the tree dies. As soon as the larvæ have completed their development they pupate. Later they develop into adult beetles. These adult beetles issue forth in swarms the following spring, to attack new trees.
The control of insect pests is a difficult matter. On areas where insect depredations are conspicuous and are liable to spread to nearby valuable timber, control measures are undertaken in coöperation with experts from the Bureau of Entomology. In these control projects, crews of men fell the infested trees, strip the bark from them, and burn the bark (usually at a time of the year when the young broods of beetles are still in the bark, namely, fall or winter). Trap trees are sometimes resorted to. In this method, trees are girdled with an ax and thereby weakened to such a degree that beetles are attracted to it. After such a tree has become thoroughly infested in this manner, it is cut down and burned. In the case of a large, conspicuous infestation, an insect reconnoissance is made, in order to obtain an estimate of the percentage of trees that have been killed by insects. When it is possible, the timber is immediately sold. For example, on the Lassen National Forest, the writer several years ago made such an estimate of an infestation caused by the mountain pine beetle, covering over 100,000 acres. The reconnoissance showed that about 35 per cent. of the trees above 12 inches in diameter had been killed. The killed timber was subsequently utilized for telephone and telegraph poles.
There are many administrative measures which are practiced on the National Forests, which aim to prevent insect infestation. The prevention and suppression of forest fires, which form infection courts for insects, is probably the most important one. In all timber sales, old dead snags and slashing, which are breeding places for insects, are disposed of. Through free use and timber sales, insect-killed timber is disposed of and the loss due to insects is reduced to a minimum, besides in many cases destroying the young insect broods.
Tree Diseases. In almost every administrative district there is a Consulting Pathologist, connected with the Bureau of Plant Pathology of the Department of Agriculture, who has charge of all work dealing with the eradication of tree diseases.
A tree disease is really any condition that interferes with the normal functioning of the tree, be this condition caused by fungi, mistletoe, fumes, smoke, frost, sunscald, drought or excess of water in the soil. Parasitic fungi and mistletoes cause most of the tree diseases. Leaf diseases, by killing a greater part of the foliage, destroy the very organs in which food for the growing tissues is prepared. Diseases of the bark intercept the flow of food coming down in the bark from the leaves. Diseases of the sapwood cut off the water supply, which is pumped upward from the roots. Those that attack the roots also affect the water supply of the tree. Diseases of flowers and seeds destroy the faculty of reproduction.
Certain parasites are able to enter the youngest parts of trees, twigs and leaves directly, but the majority of the fungi causing decay of the wood can get into the interior of the living tree only by way of a pin knot or wound. For this reason, every wound caused by lightning, by fire, by man, or by animals, constitutes a menace to infection. Many coniferous trees cover their wounds by an aseptic coat of pitch, which is very effective in preventing the germination and growth of fungus spores. But the less resinous conifers and the hardwood trees do not cover their wounds very effectively; large wounds are not covered at all. Upon exposure by a wound, the sapwood just underneath the bark dies, dries out, and checks. Spores of parasitic fungi enter the cracks, germinate and infect the heartwood. The spores of a heartwood-inhabiting fungus cannot germinate and thrive unless they fall upon the heartwood of the tree. In this way certain diseases of the heartwood, which result in rot or decay, can very frequently be traced directly to fire scars, lightning scars, spike tops, broken limbs or branches, and other mechanical destruction caused by lightning, fire, storms, cloudbursts, or heavy snowfall.
Fire as a cause of wounds is responsible for more cases of heartrot than all other injuries taken together. For this reason the protection of forests from fire is the most important preventive measure that can be taken to eradicate tree diseases. In fact, the best way of controlling diseases is by preventing them, and the Forest officers are endeavoring to eliminate any danger to the health of the forest, to prevent the injury of the trees, and to establish healthy conditions for their growth. This is forest hygiene, and it bears the same relation to the trees and forests as personal hygiene and community sanitation do to persons and communities.
It is impossible to grow a sound and thrifty forest for future generations if there are unhealthful conditions in the forest that are a constant menace to the trees. The first step in this hygienic work is close observation on the part of the Forest officers. The next important step is to prevent the infection and infestation of sound trees by getting rid of all diseased and insect-infested living and dying trees. By means of timber sales and free use, Forest officers very materially help in establishing healthy conditions on the National Forests. There is a clause in most timber sale contracts which requires the cutting by the purchaser of all snags and other unhealthy trees on the area. This measure not only eliminates undesirable trees from a hygienic standpoint, but it also makes it possible to utilize the merchantable timber left in undesirable trees, which would otherwise go to waste. On timber sales, Forest officers who do the marking leave for reproduction only such trees as are perfectly sound and healthy. Mistletoe infested trees, especially, are marked for cutting, for neither in plant nor in animal life can healthy offspring be expected to develop under unhealthful conditions.
Figure 49. Wrecked farm buildings due to flood of May 21, 1901, Nolichucky River, near Erwin, Tenn. This is one result of denuding the Appalachian Mountains of their forest cover.
Figure 50. When steep hillsides are stripped of their forest growth, erosion results. Erosion has been especially serious in the Appalachian Mountains. View taken in Madison County, North Carolina.
Water Supply. Undoubtedly the greatest value of the mountain forests of the West, most of which are within the National Forests, lies in their influence upon the regularity of the water supply. In many States these mountains afford the only water supply for domestic use, for irrigation, and for the development of power. The future development of the entire region depends, therefore, upon a regular water supply. It is not so much the amount of water as the manner in which it flows from the mountains that is important. To insure this regularity, the vegetative covering is an important factor. For this reason, Congress made the preservation of conditions favorable to stream flow one of the principal objects in the establishment and administration of the National Forests.
Many of my readers who have lived out-of-doors a great deal have learned by common observation the simple problem of how the forest regulates stream flow. Any one who has been in a treeless region after a heavy rainstorm can recall how suddenly the streams swell and flood their banks, and how soon these same streams return to their former flow. On the other hand, a severe rainstorm in a forested region will hardly have an appreciable effect upon the streams. The difference is not very hard to explain. In a treeless region there are no natural obstacles which might delay or prevent the raindrops from reaching the ground. The soil is usually hard and dry, and the water runs off as though from a gable roof. In a forest, we well know, the crowns of the trees intercept most of the rain that falls; very little strikes the ground directly. The rain that strikes the crown is dissipated on the leaves or needles, on the twigs and branches, and on the trunk. It must travel a long way before it reaches the ground, and all this delay helps in preventing a rapid run-off or flood. The soil in the forest is covered by a living ground cover of flowers, shrubs and young trees, and by a dead cover composed of leaves, twigs, dead branches, fallen trees, all of which interrupt the raindrop's journey to the ground. Even after the rain reaches the ground, only a small part of it goes off as surface run-off. The soil in the forest is loose and full of holes and channels made by decaying roots, earth worms, etc., so that the water is absorbed as fast as it reaches the soil. Also the soil in the forest contains a large amount of organic matter, resulting from decaying leaves and branches, and this organic matter acts as a great sponge, because it is capable of holding several times its own weight of water. As a result of the living and dead ground cover, the crown cover, and the organic matter in the soil, the rainfall is fed to the streams gradually through weeks and months, instead of a few hours, and the nearby rivers have a steady, equable flow, instead of alternate stages of floods and low water.
Closely bound up with the protection of watersheds is the erosion problem. Without a forest cover, rain runs off mountain slopes very rapidly, often carrying with it silt and sand, and, in severe floods, even rocks and bowlders. A well known physical law states that the carrying capacity of a stream increases as the sixth power of its velocity. In other words, double the velocity of a stream and you have multiplied its carrying power by 64; increase its velocity ten times, and you multiply its carrying power by a million. The delay caused by the forest cover in each raindrop's journey down a mountain side not only prevents floods, but also preserves the fertility of the fields in the valleys below.
Many streams in the West carry such enormous amounts of silt that the storage capacity of reservoirs has been seriously impaired, even within a comparatively short time. Then, also, there is the added difficulty and expense of keeping the diversion works—the ditches and canals—free from an excess of this material. Studies which have been carried on to determine in what way the administration of the National Forests can keep the destructive processes of erosion at a minimum have shown that the balance between the stability of the soil and rapid erosion on many slopes is so delicate that only a slight abuse may result in complete loss of the fertile top soil and permanent changes in the character of the vegetation.
In August, 1909, the town of Ephraim, on the Manti National Forest, Utah, experienced a disastrous flood from Ephraim canyon, which was attributed in part to the overgrazed condition on the watershed. An examination made the next spring clearly demonstrated that the severity of the flood was a direct result of deterioration of forest, brush, and grass cover, due to overgrazing during a long period of years. The canyon was therefore closed to grazing as an immediate protective measure. Plans were thereafter made to restore the forest cover of the canyon by planting.
Figure 51. A fertile corn-field covered with sand, gravel, and débris brought down from the mountains by floods. These farm lands are ruined beyond redemption. This could have been prevented by preserving the forests on the watershed of this river.
In this kind of protection work, as in the case of forest fires, it has been found that preventive measures are much more effective and much less costly than remedial measures. The regulations under which the Forests are administered give the Secretary of Agriculture power to institute preventive measures. To insure the sufficiency and purity of the water supply of a municipality or of an irrigation district, or to prevent floods and snowslides, the use of watersheds for grazing, timber, special uses, or settlement is especially restricted when such restriction is found to be necessary. On steep grass or timber-covered mountain slopes both grazing and timber sales are prohibited, if necessary.
Public Health. From the relation which the National Forests bear to the streams that issue from them, it will be seen that they may exert a great influence upon the health and general welfare of the communities in the valleys below. All persons either permanently or temporarily camped upon National Forest land are liable to trespass proceedings if unsanitary conditions result from their presence. All camp refuse must be disposed of either by burying or burning. This regulation applies to hunting and fishing parties, as well as to large logging camps, sawmills, and construction camps on National Forest lands. Thus the regulations strictly guard against the pollution of the water supply of the people who live in the large towns and cities, and also those who live on the Forests or near them. The watersheds tributary to many of the large western cities and towns are under special protection by the Forest Service. Under this sanitary regulation, it is possible to maintain such control of them as will greatly reduce the danger of typhoid and other enteric diseases.
Violation of Game Laws. Wild game, fish and birds add materially to the enjoyment of the National Forests by the public, and their protection and preservation is a duty of Forest officers. Although this duty rests primarily with the State the Forest Service assists, as far as practicable, in the protection of game on the National Forests from illegal practices. Forest Service officials are at the same time State Game Wardens. In the event of a violation of the state game laws, they either apprehend the offender or report the matter to the proper state official.
Various kinds of game and bird refuges may be included within National Forests, depending upon whether they are created by specific acts of the State Legislature or by Acts of Congress. In these refuges, hunting, trapping, willfully disturbing, or killing any game or bird is prohibited. Whether the violation occurs in the state game refuge or the national refuge, the Forest officer has authority to arrest the offender without warrant.
[CHAPTER IV]
THE SALE AND RENTAL OF NATIONAL FOREST RESOURCES
The timber, the pasture, the water and mineral resources and the land in the National Forests are for the use of the people, and they may be obtained for legitimate use from the local Forest officers without delay. In fact, the Forest Service is doing all it can to encourage all kinds of business which depends upon National Forest resources.