The Newer Fruits in 1915 and How Secured.
PROF. N. E. HANSEN, STATE COLLEGE, BROOKINGS, SOUTH DAKOTA.
Mr. Hansen: Mr. President and Fellow Members: This subject is not an entirely satisfactory one this year owing to the fact that we lost about three sets of tomato plants from frost, the last frost coming the ninth of June. These conditions, of course, are unusual, but it prevented the fruiting of a lot of new fruit seedlings which appeared promising. However, I decided to propagate two new plums because they had borne several excellent crops. One of these is a very late plum of good quality, with flesh of peculiar crisp texture, which ripens after all the other plums, about a week before frost. It is a combination of the Wolf plum with the Kansas sand plum (Prunus Watsoni). The tree is of late dwarf habit but very productive, and its late season may give it a place.
Another plum which I decided to place in propagation is a hybrid of the wild plum of Manitoba with the Japanese plum. The mother tree was raised from wild plum pits received from Manitoba a few years ago. These bear very freely and are the earliest of the native plums. The tree is of low, dwarf habit. The fruit is not as large as my Waneta, which is a hybrid of the largest native plum, the Terry, (Prunus Americana), with the Apple, one of the best of Burbank's Japanese plums. But since the range of the plum Manitoba is so far north, it may give greater hardiness where that is needed. At any rate, it is of interest to know that the Manitoba native plum can be mated with the Japanese plum.
Pears constitute my favorite line at present. "What can I do for hardy pears?" is a question I have been asked many times. The prairie northwest cannot raise pears owing to the cold or the blight. In my travels in Asia, including four tours of exploration in Siberia, I made a business of buying up basketfuls of pears in Manchuria, Mongolia, Western China and Eastern Siberia and saving the seed, giving the flesh away to the coolies, who were glad always to get the fruit. These have raised me many seedlings. In addition I have imported a lot of pears from Russia.
Pyrus Simoni The hardy, blight-proof sand pear used by Prof. N. E. Hansen in breeding pears for the Northwest. A careful study of our eastern Arctic pears has been made recently by Mr. Alfred Rehder, botanist at Arnold Arboretum, and this form of sand pear is now called Pyrus Ovoidea instead of Pyrus Sinensis, or Pyrus Simoni.
The pears of northern China and eastern Siberia are usually called the Chinese sand pear and have been given various names, Pyrus Sinensis, Pyrus Ussuriensis, Pyrus Simoni. The form I am working with mainly was received in the spring of 1899 at the South Dakota Station under the name of Pyrus Simoni, from Dr. C. S. Sargent, Director of the Arnold Arboretum, Boston, Massachusetts. Since the publication of Bulletin 159, of the South Dakota Experiment Station, April, 1915, in which I give a brief outline of this work, the pears of this region have been studied by Dr. Alfred Rehder of the Arnold Arboretum, and it now appears that the true name of Pyrus Simonii should be Pyrus Ovoidea. These trees have proved perfectly hardy at Brookings and have never suffered from blight. Varieties of other pears have been top-grafted on this tree, and they have blighted, but the blight did not affect the rest of the tree. Mr. Charles G. Patten, Charles City, Iowa, also has a form of the Chinese sand pear which has proven immune to blight. In other places sand pears have been under trial which have suffered from winter-killing. However, I understand that the pear Mr. Patten has tapers toward the stem, while the pear received by me as Pyrus Simonii tapers toward the blossom end. The actual source of seed is really of greater importance than the botanical name, as it is possible to get the seed from too far south, whereas we should plant only the northern form of the species.
The fruits of Pyrus Ovoidea correspond in size to the ordinary pear much like the Whitney crab-apple does to the apple. It is a real pear, juicy and sweet, but not high flavored. Other varieties of pears have been top-grafted on this tree and have blighted, but the blight did not affect the rest of the tree. During the many seasons I have had this pear the tip of one twig only showed a very slight trace the past season, but I did not determine it was really blight. It is practically immune.
I have also worked the Birch-Leaved pear, Pyrus betulifolia, Bunge, a native of northern China, and a choice ornamental tree. Trees of this species were received from a nursery in Germany in the fall of 1896 and have proven perfectly hardy and quite resistant to blight. The fruit is quite small, usually less than one-half inch in diameter, covered with thick russet. Betulifolia means birch-leaved, alluding to the shape of the leaf.
Now, the pear is a difficult thing to work with on account of blight. What is blight? It is an American bacterial disease, not found in the home of the pear, Asia or Europe, so that during the 6,000 years of its cultivation of recorded history the pear has never had to meet the bacterial enemy known as blight. That is one of the reasons, I presume, why they have such strict quarantine in Europe against American trees. The question with pears is, will they stand blight or not? They are spending hundreds of thousands of dollars in California to keep out blight. Blight is a native of the northeast United States, and they are keeping it down on the Pacific slope, but they are always on the edge of the precipice. The whole pear culture of America is in an unsatisfactory state, owing to this danger.
With these two northern pears as a foundation, I have endeavored to secure seedlings with fruit of large size and choice quality by hybridizing them with many of the best cultivated pears from Germany, France, England, Central Russia and Finland, as well as with some of the best varieties from the eastern pear-growing regions of the United States. The work has been done mostly under glass in our fruit-breeding greenhouse. Some of these fruits weighed one and one-fourth pounds. Some of the resulting seedlings are subject to blight, while many have thus far shown immunity. Since it is impossible to determine their relative immunity to blight except by distributing them for trial elsewhere, I sent out scions in the spring of 1915 of thirty-nine of these new seedlings to twenty-four men in several states. These varieties are under restrictions until fruited and deemed worthy of further propagation.
Crossing work in pears—view in Prof. N. E. Hansen's Fruit-Breeding Greenhouse, State College, Brookings, S. D.
I did not know whether immunity to blight is a possibility or only an iridescent dream, so I made no charge for these scions. The only test of a pear seedling, the same as with the apple, is that of propagation. Furthermore, if you have but the one seedling tree you may lose it by accident; whereas, if you send it out to a number of good men, you cannot lose it.
It should be distinctly understood that none of these new seedlings have borne fruit, but by what may be termed the projective efficiency of the pedigree I am satisfied that some of them will be valuable. In like manner, a horse-breeder depends so much on the pedigree in his colts that he is willing to enter them in a race. I believe something of value will come from this line of work. I do know that my Pyrus Ovoidea is a pretty good, juicy little pear, a whole lot better than no pear at all. I hope these seedlings will keep up their immunity to blight. The original seedling trees certainly have had every chance to become affected by blight, as they were surrounded by blighting apple trees, crab-apple trees and pear trees, and no blight was cut out. I thought this was the best way, since that is the test they will have in the farmers' orchards when they go out from the nursery.
Hardy Pear Stocks.—Now we are up against the problem of stocks for these hardy pears. The quince is a standard dwarf stock, but it is not hardy enough for us. Last spring I planted 12,000 seedlings of the various commercial pear stocks, including imported French pear seedlings, American grown French pear seedlings, Kieffer pear seedlings and Japan pear seedlings. From one season's experience I like the Japan pear the best. The French pear seedlings, especially, did not do well. The Japan pear stock is coming into high favor in recent years on our Pacific slope, where it is sometimes called the Chinese blight-proof stock. The French pear stock is not in favor on our Pacific slope owing to their liability to blight. We may also expect from the French pear stock a decided lack of hardiness. The Japan pear stock is probably some form of the Chinese sand pear. The seed may come from too far south, whereas we should plant only the northern form of the species. This varying degree of hardiness in the Japan pear seedling of commerce I find discussed in a German horticultural paper. I have tried to establish a regular source of supply by importing the seed, but it is difficult indeed to do this. To avoid root-killing at the north we should mulch these Japan pear seedlings heavily until we get enough orchards of this truly hardy form, Pyrus Ovoidea, planted so we can raise our own stocks. I firmly believe we will extend pear culture on the North American continent clear to the Arctic Circle if we wish.
For pear stocks I am going to try everything I can think of. Some years ago I worked pears on Juneberry stock from a hint given me many years ago by Professor J. L. Budd. These grew well and were in full bloom when five feet high, but were lost in clearing off a block of trees. I hope to try this again on a larger scale. The mountain ash and hawthorn are sometimes used, but both will be expensive and perhaps short-lived. The quince is the dwarf stock of commerce but would need to be very heavily mulched to prevent root-killing. Such dwarf pears are splendid in the back yard, or for training up against the side of the house; the fruit is fine and large, and the trees fruit the second year. The pear will root in nursery by grafting with a long scion on apple seedlings. I hope there will be much work done along this line.
To sum up the question, I think there is a hardy pear in sight. We have the requisite pedigree back of it, and it seems that the quality we call immunity to blight is in some of these Chinese or Siberian pears. If we can combine the hardiness and blight-resistance of this Siberian pear with the large size and high quality of fruit of the European pear, with thousands of years of cultivation back of it, then we have the solution of the pear question in sight. Millions and millions of people are watching for a good hardy pear. (Applause.)
Warning to Mushroom Growers.—As the result of a serious case of mushroom poisoning in a mushroom grower's family recently, the mushroom specialists of the U. S. Department of Agriculture have issued a warning to commercial and other growers of mushrooms to regard with suspicion any abnormal mushrooms which appear in their beds. It seems that occasionally sporadic forms appear in mushroom beds, persist for a day or two, and then disappear. These are generally manure-inhabiting species and may be observed shortly after the beds have been cased. In the instance cited, however, these fungi appeared in considerable numbers at the time the edible Agaricus campestris should have been ready for the market, and the dealer supposed it was probably a new brown variety and tried it in his own family. As a result, five persons were rendered absolutely helpless and were saved after several hours only through the assistance of a second physician who had had experience with this type of poisoning.
In the opinion of the Department, this case is peculiarly significant and demonstrates that the grower must be able to distinguish Agaricus campestris from any of the wild forms of mushrooms that may appear in the beds. Under the circumstances, the Department strongly urges every grower to make himself thoroughly familiar with the cultivated species. Complete descriptions, with pictures of poisonous and cultivated species, are contained in Department Bulletin 175, "Mushrooms and Other Common Fungi," which can be purchased for 30 cents from the Superintendent of Documents, Government Printing Office, Washington, D. C.