Part 5

On account of extremely hot weather coming so early the nut trees were grafted earlier than usual and in this order: chestnuts, bitternuts, hickory stocks, shagbark stocks and, after a few days, the walnuts and pecans. The grafting was successful in the order worked. Immediately after the walnuts and pecans were worked the temperature began mounting, reaching 114 deg. F. in the shade at one time, and of course much more in the sun and just above the bare dry ground. The chestnuts and bitternuts had time to knit together before the extreme heat and gave a splendid stand. The shagbarks also made a good stand. But the walnuts and pecan stocks were near a total failure. Apparently what occurred was that the grafting wax and paraffin which was coated over the scion melted and penetrated the union, like that much kerosene or penetrating oil, and prevented callusing. The cions remained plump and green for a long time except for a thin layer at the cut surfaces. The usual resin, beeswax, linseed oil and lamp black grafting wax was used. Can anyone suggest a wax which will remain absolutely dry under the conditions described above? What happened, as near as I can tell, is that the extremely hot weather and the continuation of it melted the grafting wax and the paraffin. They fused and made a new combination which looked like grease and absolutely prevented any growth. The shagbark hickories gave a good stand, about as perfect a stand as you could expect in hickories. Last of all the pecan stocks were worked. They should have been the easiest to work but they were a total failure. That is because the hot weather set in less than a week after they were set, while the others had more time. The problem I would like to see solved is one of a wax which will remain absolutely dry during such times, and I think then we will have solved one of the big problems of propagation.

PROF. NEILSON:

I've had more or less trouble with grafting waxes since I began to graft nut trees, and I have therefore been looking for a wax that would stand up under extremely hot weather and which could be applied cold and was not too costly. I think I have found one that comes nearest to the ideal. It is an asphalt tree emulsion made by the Flintkote Co. of New York City. This emulsion can be purchased in five gallon drums at 60c a gallon in Detroit. It can be diluted with water and applied in a thin or heavy coating. I used this wax last summer and I am better pleased with it than any other wax I have ever tried.

MR. WEBER:

I thought a few years ago that I had eliminated wax trouble, but finally I came to the conclusion that when you have a temperature that runs beyond the place that will melt ordinary paraffin the heat will kill the grafts.

MR. WALKER:

This question is an old one. Last winter and the winter before I did a little work on the old reports. You will find some mighty good winter reading there. I find things hashed and rehashed over and over again. The subject of grafting wax, of course, was discussed years ago. I might caution you on the asphalt. It will have to be the highest, purest grade.

MEMBER:

You can easily prevent wax from getting in between the scion and the stock by using a paper or cellophane.

MR. SNYDER:

These grafts were tied with tape. I'm sure that this oil would penetrate anything which was not absolutely air tight.

Winter Injury of Filberts at Geneva 1933-34[A]

_By_ G. L. SLATE

_New York Experiment Station, Geneva, N. Y._

Last year I reported to you the winter injury to the Geneva filbert collection resulting from a very mild winter. This year I am reporting the damage resulting from the coldest winter on record in western New York. Varieties that have withstood both winters may be considered sufficiently hardy for anything western New York and regions with a similar climate have to offer in climate.

A brief summary of the winter and its effects on other fruit plants in the vicinity of Geneva will serve as a background for the data on filberts. The first severe cold occurred on December 29 when the temperature dropped to -21 deg. F. This equalled the previous low record established in February, 1896. On February 9 the minimum temperature recorded was -31 deg. F. or ten degrees lower than anything previously recorded in the history of the Station. The minimum on February 8 was -16 deg. F. and on February 10, -18 deg. F.

Fruit trees suffered severe injury from these extreme temperatures. Nearly all the older Baldwin apple trees in the vicinity were killed or so severely injured as to be of no further value for fruit production. Peach fruit buds were all killed and many of the trees succumbed, even in well cared for orchards. Very few sweet cherry buds survived, and many trees were injured or killed. Delaware, Catawba and Niagara grapes were also killed to the ground or lost most of their buds. Japanese plums failed to bloom, and the trees were severely injured. Nearly all climbing roses were killed to the ground. Even the native elderberry, Sambucus canadensis, was killed back in many cases. Such was the winter experienced by the filberts.

Before classifying the filbert varieties as to their hardiness, some general statements regarding the effect of the cold on the filberts may be of interest.

The injury to the wood seemed to be due to a gradual drying out and the clear cut distinction between winter killed wood and live wood so evident in peaches, apples, and pears did not show in the filberts. The wood of the filberts had a dried out appearance with a few brown streaks so that one could not predict definitely in February the amount of injury. It was not until midsummer that a true picture of the injury to the wood could be obtained. This gradual drying out of the wood without the clear cut distinctions between dead and live wood also characterized the winter killing of the wood of grapes and raspberries. In the spring new growth on the injured filbert wood started late. If the injury was slight the foliage soon reached normal size. In some cases the early leaves were very small, but later attained normal size. With trees that were severely injured the leaves remained small until midsummer and then gradually turned yellow and died. Many branches were killed outright and failed to start or only a bud here and there would start. On the trees of a few varieties that were injured the least, a few small leaves were the chief evidence of winter injury.

The recuperative power of the filbert seems to be nearly as great as that of the peach and pear insofar as this may be determined by observation in the orchard. In spite of the past winter the station filbert orchards present a fairly good appearance except for a few varieties. It is probably safe to consider filberts as hardy as peaches and sweet cherries.

The flowers of the filbert show a greater range in hardiness than those of peaches and sweet cherries. The staminate flowers or catkins of a few varieties are definitely hardier than peach flowers. Not a single peach blossom survived but three filberts bloomed with only slightly more than the usual amount of catkin killing. The pistillate or female flowers are much hardier than peach flowers. The pistillate flowers are also hardier than the wood as flowers were observed on trees the wood of which was nearly dead by midsummer. In the older orchard about 16 varieties bore a number of pistillate flowers that were recorded as medium or greater. These did not all set nuts, however, owing to the scarcity of pollen, but the crop on seven varieties was about medium. It should be emphasized at this point that there were no peaches, practically no Japanese plums, very few sweet cherries, and very few grapes in the Station orchards and vineyards this year. Trees in the partially protected orchard fared somewhat better in regard to catkin injury than those in the more exposed orchard. That full exposure to the wind has much to do with winter killing of catkins is shown by the following. After the severe freeze of December 29 and 30 when -21 deg. F. was experienced, catkins of several varieties were forced in the office. These all opened and shed pollen normally. January 29 and 30 near zero temperatures were experienced with very strong winds. Catkins forced in the office immediately after this were nearly all killed. Since zero temperatures are not uncommon at Geneva in winter, but are rare with strong winds, much of the injury may be attributed to the combination of wind and cold.

Young trees were injured less in wood than old trees. This is well shown by a comparison of two lots of Kentish Cob of different ages. Nine 9-year-old trees were killed back from 50 to 80 percent in addition to considerable weakening of the remaining wood. Eleven two-year-old trees in the same orchard were uninjured.

The importance of exposure to winds as a factor in causing catkin killing is further shown by a comparison of catkin killing in the two filbert orchards at Geneva. In the younger orchard which is exposed to the full sweep of the west wind not a catkin survived on any of the 66 varieties in that orchard. In the other older orchard which is protected on the west and north by buildings and spruce trees, sufficient catkins survived on three varieties to provide for proper pollination. In discussing the effects of winter injury on the different varieties it will be necessary to make a distinction between the two orchards. Orchard 6 is the partially protected planting while Orchard 16 is fully exposed. Most of the trees in Orchard 6 were nine years old, while those in Orchard 16 are six years old or less. Wood injury, catkin injury, and pistil injury will be treated separately.

In the first group are those varieties which suffered very severe wood injury. They are Clackamas, Early Globe, English Cluster, and Oregon. The latter two are very similar and may be identical. These were all nine year old trees located in Orchard 6. The trees were so severely injured that their recovery is doubtful and the development of new trees from suckers will be necessary. Clackamas evidently suffered root killing as only one of the six trees is producing suckers. In this group the trees leaved out, but the foliage was small, usually less than one-fifth the size of normal foliage, and growth weak. By August the leaves were yellow and many were shrivelling.

Varieties moderately to severely injured in Orchard 6 were Barcelona, Kentish Cob (Du Chilly), Fertile de Coutard, Minna, Purple Aveline, Red Aveline, White Aveline, White Lambert, D'Alger, and Montebello. In Orchard 16 the severely injured varieties were Garibaldi, Kentish Filbert, Marquis of Lorne, Princess Royal, Red Skinned, The Shah, Webbs Prize Cob, Bandnuss, Einzeltragende Kegelformige, Liegels Zellernuss, Multiflora, Schlesierin, Sicklers Zellernuss, Truchsess Zellernuss, Vollkugel, Volle Zellernuss, Romische Nuss, Kruse and Rush. The trees of varieties in this group were severely injured, but have a fair chance of recovering. In many cases from 50 to 90 percent of the top was killed outright, and new growth was weak. Most of the trees have a few fairly strong shoots from the trunk or larger branches from which a new top may be developed. Four out of 22 trees of Barcelona were killed entirely, indicating root as well as top killing.

The last group includes those varieties of which less than 20 percent of the wood was killed. The new growth was weakened slightly or not at all. In many cases the tree is apparently uninjured and occasionally a single tree of a variety may be severely injured while the others are unhurt. Varieties in Orchard 6 belonging in this group are Alpha, Buttner Zeller, Cosford, Daviana, Gubener Zeller, Gunzlebener Zeller, Gustav Zeller, Lange Landsberger, Fichtwerdersche Zeller, Noce Lunghe, Italian Red, Large Globe, Medium Long, Bollwiller, Nottingham, Halle, Red Lambert, Gasaway, Guebener Barcelloner, Blumberger Zeller, Bixby, Jones Nos. 83, 207, 269, 310, and Corylus colurna.

In Orchard 16 varieties in this group include Cannon Ball, Duke of Edinburgh, Pearson's Prolific, Barr's Zellernuss, Berger's Zellernuss, Beethe's Zellernuss, Eckige Barcelloner, Grosse Kugelnuss, Heynicks Zellernuss, Jeeves Samling, Kadetten Zellernuss, Kaiserin Eugenie, Kurzhullige Zellernuss, Longe von Downton, Ludolph's Zellernuss, Luisen's Zellernuss, Mogulnuss, Neue Riesennuss, Northamptonshire, Prolifique a coque serree, Imperial de Trebizond, and Russ. Native sorts in this group are Winkler, Littlepage, Wilder, a Corylus americana variety from the east end of Lake Ontario, and a Corylus rostrata from Rhode Island. Seventeen 3-year old French varieties were also uninjured, but in view of the general lack of wood killing, on young filberts, they are not included in this list. It is evident then that we have a number of varieties of which the wood is fairly hardy.

Catkin killing was very severe in both orchards and only those varieties which had a few live catkins are listed. In Orchard 6 the catkin killing on five trees of Italian Red ranged from 20 to 50 percent and on six trees of Red Lambert from 10 to 20 percent. A few catkins on Alpha also survived. The remaining 35 filbert varieties in this orchard lost all their catkins. Several Jones hybrids in this orchard fared somewhat better. A few catkins survived on Bixby. Jones 269 lost 10 percent, Jones 310 lost 30 percent, and Jones 207 lost none of its catkins. All the catkins were killed on Jones 83.

In Orchard 16, the story is soon told. Not a single live catkin was found in the spring on the 66 filbert varieties in this orchard. Of the native hazels Bush lost all its catkins, and Winkler none. All catkins were dead on the Corylus rostrata from Rhode Island.

As stated earlier, the pistillate flowers were hardier than the catkins and nearly all varieties in both orchards had at least an occasional female flower. However, only those in which the number of pistillate flowers was described as medium or numerous will be recorded here. In Orchard 6 these varieties were Alpha, Cosford, Fichtwerdersche, Gubener Zeller, Gunzlebener Zeller, Gustav's Zeller, Longe Landsberger, Noce Lunghe, Italian Red, Medium Long, Bollwiller, White Lambert, Gasaway, Gubener Barcelloner, Blumberger Zeller, and Unknown. Five Jones hybrids including Bixby had a full pistillate bloom. Due to wood injury and possibly to a scarcity of pollen only a few of these varieties bore more than a few nuts. Varieties bearing a medium crop are Cosford, Italian Red, Medium Long, Gubener Zeller, Gunzlebener Zeller, Bollwiller, and Unknown. Four of Jones hybrids including Bixby, are bearing fair crops. The other varieties in this orchard are bearing only an occasional nut or none.

In Orchard 16 the pistillate flowers were described as medium or numerous on the following varieties: Barr's Zellernuss and the Winkler hazel. The other 65 varieties bore only an occasional flower. No filbert pollen was available in this orchard, consequently Winkler is the only variety fruiting.

In Orchard 16 were 534 two-year-old trees from crosses between Rush and various filbert varieties. The cross was made by Mr. Reed and the seedlings were sent to Geneva by the late Mr. Bixby. Of these 534 seedlings, 62 bore catkins. The catkins on 14 of these were uninjured, 19 had varying amounts of injury, and 29 suffered 100 percent killing. Three hundred and ninety-two bore pistillate flowers and 74 of these would probably have had full crops had they been pollinated. In view of the complete loss of catkins on the filbert varieties in this orchard, the survival of catkins on about half of the blooming seedlings is of considerable interest to the filbert breeder. In addition, none of these hybrids experienced any wood killing.

If the list of varieties which passed through the very severe winter of 1933-34 is compared with the list of varieties which were not seriously injured by the very mild winter of 1932-33, only two sorts, Italian Red and Red Lambert are found to be satisfactorily hardy in wood and catkin. Red Lambert is too unproductive to be used except as a pollenizer. Italian Red may therefore be considered the most promising variety now available for western New York conditions. The nut is satisfactory and the tree is one of the most productive. Cosford and Medium Long may also be considered among the hardiest in spite of the complete loss of catkins last winter. In all previous winters they have been among the hardiest in wood and catkins. No variety should be eliminated because of a lack of hardiness during the coldest winter on record in the region where it is being grown, if it possesses other desirable characters.

I think considerable encouragement may be derived from the previous winter's experience. We are at last down to rock bottom and know what is hardy and what is not. It is evident from the behavior of the Jones hybrids and Mr. Reed's hybrids involving a similar parentage that sufficiently hardy varieties will result from this line of breeding work to make filbert culture possible in those sections of the country that are not too cold for peaches.

[Footnote A: Approved by the Director of the New York State Agricultural Experiment Station for publication as Journal Paper No. 49.]

Notes on Hickories

_By_ A. B. ANTHONY

_Sterling, Illinois_

I am satisfied only when I am trying for the best, and the best to me in nuts is the hickory. For the past nine years in the nut season, and sometimes out of it, for nut shucks tell their story, I have been combing my own territory with hopes of finding some hickories more worth while. About twenty miles westward from my home brings one to the Mississippi River. One hundred years ago most of this twenty mile land tract was covered with timber, more or less interspersed with hickories, most of which have been cut down. Along the Mississippi there were then shellbarks and shagbarks, together with pecans, the latter of which I understand are all gone now. My own location was originally prairie land out of which one could not go in any direction without passing through a woodland tract. These nearer woods held in nut trees more shagbarks than of any other nut variety, with the bitter hickory nut coming in second place. As I thought about it, given a good enough tree, it seemed to me the hickory was the greatest one we could grow. Grandfather had let pass his opportunity to save any choice ones. So had my father. And if the neighborhood zest was overfreighted with purpose to find such trees I had not found it out. It looked to me like a worthwhile endeavor not to let this neglect go further, even though chance finds were much lessened from what they probably once were.

Having three or four kinds of hickories is no doubt a fine thing for us. Nature cannot manage nearly so well with them as can man, but she makes something of a hit once in a while. More than we think for, perhaps, in the hickories we are using to graft from, there is quite likely, in the sizeable shagbarks, something besides shagbark. Their distinctiveness, for which we selected them, is due to a fortunate, unlike cross bringing out their exceptional characteristics. What most hinders progress is quite conceivably a sort of swamped unchangeableness. That is very possibly the likely ailment we've got in our hazelnuts. There were no three or four kinds of them scattered more or less everywhere about the country with which nature could make chance crosses as with hickories. Seemingly my locality ought to yield as many, perhaps more, exceptional hickory specimens than many could. Here, or near here, the pecan of the south had reached its northernmost trek. Here also was the shagbark, shellbark, bitternut. And uniformity here should have more chance of a knockout. A riddance of sameness. Hazelnuts conceded no such diversity to help nature make freaks. In the hickory field was alteration, hope, and chance.

In the assemblage of varieties there is given opportunity for crosses that nature occasionally delves into, and in the additional eccentric types getting mixed, tending to offer in rare instances special merit. We have then through mixture, not that fixedness that usually stands in the way, but a getting away from set types where once in thousands of offerings a more useful specimen is made, one nature herself cannot handle to our advantage, but for which we should have our eyes open, and make use of when chance comes our way.

Just two years ago tomorrow I came upon what to me was an eye feast. A half grown hickory tree whose top-most limbs bent as in rare instances do limbs when heavily laden with sleet. And the nuts were of good size for shagbarks. With the shucks off there were forty-two pounds of them. They proved to be quite good crackers. I sent a sample to Dr. Deming and he very considerately gave them the name Anthony. From the shape of the nut, I believe it has a trace of the bitternut hickory in its make-up. Mr. Reed has likewise expressed such an opinion in writing me regarding it. This foreign blood tinge gives it, I believe, its jump in size and its rather attractive form, also I think, a bit lessening in quality. While we would like the very highest quality in our nuts, it is conceivable that it may be advisable to do with them as is done with peaches. Take the Elberta, with its many good traits, even though it does fail somewhat in quality.

Having found this nut tree just two years ago hardly gives time enough for adequate judgement of its merits. With something like three-fourths of an inch of rain this year, from sometime in March to the seventeenth of June, none of our crops can be judged by their performance. Skipping last year, except for a very few nuts, this hickory came out this season heavy with bloom. I was watching it at blooming time. On May 23 I brought home from it a bit of bloom, laid it on a paper and the next morning it had shed its pollen. The next morning after that we had a frost on low ground. This tree is near such ground. With frost, and two dry seasons, this year's crop has amounted to but one and one-half quarts. Most hickories have done little since 1932.

Another hickory tree found last year that I call No. 2 did have four and one-half pounds on it last season. It is hardly half grown, is a shagbark, my best find toward cracking out in halves, and the earliest in maturing nuts of any hickory I have found. It has no crop this year but is worth keeping an eye on the coming seasons.

No. 3 is my best find in quality, quite good of cracking, good in size for a shagbark and has possibly a trace of shellbark in its make-up. While bearing light crops, it has been very consistent in doing so every year for at least three years. It is an old tree, medium early in maturing its nuts and doubtless could do better if freed from the under and surrounding smaller trees. Its crop, shucks on this year, is sixty-five pounds, or above eighteen pounds shucks off but not dried.