The Running Out of Varieties.
PROF. C. B. WALDRON, HORTICULTURIST, AGRI. COLLEGE, N. D.
There is no fact more familiar to gardeners, orchardists and farmers than the "running out" of varieties, and no question that is more obscure as to its causes. The possibility of deterioration of varieties is noted to a greater or less extent in all field and garden crops, particularly with those that are most highly developed, or which represent the greatest departure from the original species.
It is evident that the cause must lie either in the environment which surrounds the variety or in the selection which it has received, or in a combination of the two. It is held also by some that aside from the influence of soil and climate, and in spite of the most rigid selection, there is an inherent tendency in varieties to depart in a more or less marked degree from the type in which they first appeared. This is particularly true of new varieties that have not yet become established. Almost before the plant breeder can determine their type they have broken up into so many distinct forms that it is impossible to get any further than the first generation.
This has been noted several times with new varieties of squashes and other cucurbits, and to a similar but less marked degree with tomatoes and some other garden crops. These might well be termed evanescent varieties, and since they never become fixed or find their way into cultivation they are of interest only to the plant breeder.
The influence of environment, particularly soil and climate, upon the size, quality and productiveness of certain garden crops is well known, though just what effect this may have in determining the hereditary character of a variety has never been very well worked out and is still a matter of much doubt. We know, for instance, that there is a tendency for corn grown in the middle or southern latitude to attain to a larger size and require a longer period for maturity than the same corn grown in the north. This tendency is shown in the first generation, but whether it appears as a constant hereditary character or not is still open to discussion.
There are those who maintain that it is just as practical to develop a dwarf, early variety of corn in the middle latitudes with careful selection as it is to develop a variety of equal earliness when the planting is done in the north. These maintain that the reason the dwarf, early varieties of corn are not normally developed in the middle latitudes is because the selection in those places is usually made from the large plants which yield well, instead of from the small, early plants, such as would be naturally selected at the north.
By the same reasoning it is held that the constant growing of any species or variety in the northern latitudes does not increase hardiness but only enables us to determine which is hardy, thereby enabling us by selection to increase the hardiness of our varieties.
Cat-leaf weeping birch and shrubbery on campus of Agricultural College at Fargo, N. D.
We must admit that this reasoning has a sound scientific basis, its principal weakness at the present time being that there has not been enough experimental work done to determine how general and constant its application is.
However true it may be as a scientific principle, we have on the other hand the undoubted fact that varieties of certain plants, like the cauliflower, are so strongly modified by environment that the varieties disappear altogether as such unless the breeding plants are grown under very definite conditions. It is well known that cauliflower seed can be grown, for instance, only in certain parts of Europe around the North Sea and to a limited extent in the vicinity of Seattle, and that cauliflower seed from any other region produces plants which not only lose all varietal characteristics but which scarcely resemble cauliflower at all.
As an illustration of this same principle millet affords an excellent example. Grown at the north for a number of years, without change of seed, it becomes short with stiff straw and very large heads, yielding a large quantity of seed. When grown as far south as Tennessee for a period of five years only, it assumes a very different character, being tall and leafy with small heads and not very productive of seed. It might be possible by very rigid selection to develop a variety of millet that would tend to be tall and leafy even in the north, but it is doubtful if it would remain so, and the difficulty of keeping it up to type would be too great to make it profitable.
All this is equivalent to saying that there are certain unstable varieties that are so influenced by climate that it is not good practice to try and keep them up to any given standard except when they are grown in regions which naturally develop the type that we are seeking to maintain.
The more striking examples coming under this class are cauliflower, millet, onions, tobacco and some of the flowering plants.
A few years ago it was supposed that the running out of varieties of celery was due to a similar cause, that is, to unfavorable environment. To this was ascribed the pithy quality that characterized some of the varieties. Upon further investigations, however, it was found that this pithy condition came about through carelessness in seed selection. There is a more or less inherent tendency in all celery to become pithy, and unless these plants are carefully excluded, the varieties will run out from that cause.
The different varieties of tomatoes, egg plant and the cucurbits do not seem to be especially affected by soil and climate, and in such instances the varieties can be kept up only by rigid selection, no matter how favorable that environment is under which they are grown. With these plants there is always the inherent tendency to go back more or less to the wild state, and lapse of care in seed selection for a period of only a few years will result in a variety very different from the one which we had in the beginning.
It will be seen from this that in some instances the best plan is for each farmer or gardener to develop his own strains of crops that he grows, while in other cases it is best to leave the selection to those that are working in a more favored environment so far as those varieties are concerned.
There still remains to be considered the plants that are propagated asexually, like potatoes and all our cultivated fruits. From the fact that a number of our standard varieties of apples and some other fruits date back one hundred years or more, and are still as productive as at the beginning, it is evident that some asexually propagated varieties may be considered almost fixed or permanent.
Niobe willow (Salix vitellina, var. pendula nova), on campus N. D. Agri. College, Fargo.
The buds or scions from which new trees are started are taken indiscriminately from the bearing trees, and since there is no great variation in them the varieties do not tend to change. Whether they could be improved by taking scions from only the most productive trees is still a question. There are some who consider this possible, but we do not yet have enough experimental evidence to establish it as a fact. So far it would seem that about the only crop which is propagated asexually that is likely to deteriorate, or is capable of improvement, is one that is directly modified by soil and climate.
The potato is the most striking example of this class of crops. It is well known that the potato responds very readily in the matter of size, yield and quality to certain types of soil and climatic conditions. It is also known that the qualities thus acquired seem to be more or less permanent; that is, that potatoes brought from the north, especially those which have been grown in heavy soil, will produce a crop some ten days earlier and thirty per cent larger than a crop grown from seed produced in a region six hundred miles farther south. Early Ohio potatoes grown in North Dakota, when used for seed in southern Iowa, give a much larger and somewhat earlier crop than the native grown seed. This would indicate that the potato is bound to run out in a measure if grown continually in southern latitudes, and in this instance a change of seed, using always the seed from the northern latitudes and the heavier soil, is necessary, in order to keep the variety up to standard.
Carnege library and flower beds at N. D. Agricultural College, Fargo.
It will be seen that while there is no question as to the fact of varieties running out, that they differ a great deal in this respect, and it is only through a knowledge of the facts covering each variety, or at least the varieties of each species, that would enable a grower to know what to do in order to keep a variety up to the highest standard.
Mr. Kellogg: What is the matter with the old Wilson strawberry?
Mr. Waldron: I think people forgot about it and began growing better varieties. I know there is an impression among strawberry growers that the Wilson strawberry has run out. I don't know. I know it has been supplanted by other varieties, and the general impression of most men is that it is because other varieties, better varieties, came in and that variety was neglected.
Mr. Kellogg: It can be found in eastern catalogs now.
Mr. Waldron: Isn't it as good now as it was?
Mr. Kellogg: That is what I want to know.
Mr. Waldron: I understand that it is from the people that have grown them. I don't know of any strawberry in my career from the first time that I have been working in strawberries that seems to be any poorer now than it was twenty-five or thirty years ago. The Wilson might be an exception. I know that has been referred to as an instance of deterioration of variety. The strawberry might be so dependent on climatic and soil conditions that it might be classed with the potatoes and not be in a class with the apples, which don't seem to deteriorate.
Mr. Kellogg: Is there such a thing as a pedigreed strawberry plant that is taken from runners?
Mr. Waldron: We have experiments going on at the agricultural college now. We set out a number of plants from strawberry growers that advertise a pedigreed strawberry, and beside those we have strawberry plants from growers who don't advertise them as pedigreed. This year we ought to get some returns on that; last year the patch was flooded out—we had very heavy June rains. We have about ten varieties from a large number of different growers, some supposed to be perfect and some not. We are going to have some report of them at the next horticultural meeting. I don't believe there is anything much in pedigreed strawberries.
The President: In the state of North Dakota our friend here who has just spoken occupies the same position in the hearts and minds of the people of his state as do our friends Haralson, Hansen and Patten in this section. His work is along a little different line, his being almost purely an agricultural section, but he is a very practical man and is doing splendid work up there.
Mr. Doty: I wish to say a word on this strawberry question. Some years ago the postmaster at Monticello wanted to know of me what kind of strawberries to set out; I was handling nursery goods at that time. I told him I would recommend to him the Wilson, the Warfield and the Haverland. The Wilson I would set in the center. He had six square rods. He set them out. The second year he invited me up to his patch and asked me to guess on how many strawberries he had raised on that patch. I said: "Six bushels"—I thought I would put it high. But he said: "I have picked twelve bushels from that patch." I said: "It can't be possible," and he said: "Come right into my shop here. I have a paper here and I put down every single quart of strawberries that I have sold here." I figured it up and found that he had twelve bushels out of that patch. I told him to set the Wilson in the center, the Warfield on one side and the Haverland on the other. He did so and that was the result, the best result that I have ever known.
The President: How many years ago?
Mr. Doty: Well, it was about fifteen years ago.