FOOTNOTES:
[6] In the NNGA Report for 1935, Mr. C. A. Reed told of studies of blossoming habits of pecan varieties at Rockport, Indiana, conducted for four seasons in co-operation with Mr. J. F. Wilkinson. There the Busseron was found to be a protandrous variety, shedding most of its pollen, and in some years all of it, before the period of receptivity of its pistillate flowers. "With Butterick ... the order was reversed, as the period of receptivity began first," and it was classified, therefore, as regularly protogynous. "... Furthermore, upon close observation it has been found," he said, that trees of the Butterick variety "develop very few pistillate flowers, and that many of these wither up and drop off, apparently because of inherent weakness. From this, it would appear that light bearing is not necessarily due to lack of suitable or adequate pollen." The Butterick had a record of practically non-bearing performances during the four years (1931, 1932, 1934 and 1935) at Rockport, which is duplicated by its performance records at other locations and other years, so it is generally on the discard list. But when it does bear and mature its nuts it is a good pecan. Mr. P. W. Wang rated it his first choice of northern pecans fruited in China.
Mr. Reed listed as protandrous Busseron, Kentucky, Major, and Niblack varieties, whereas Butterick, Indiana, and Posey were protogynous. He did not specify in which class the Greenriver fell. Major during each of the four years, had an interval of 1 to 3 days between the last shedding of pollen and the first pistil receptivity; Warrick, an obsolete variety, had some overlap each year as did Indiana and Posey. The Kentucky, a discarded variety, had overlaps the three years it was observed. In two years it was observed, Niblack had staminate and pistillate flowering together one season, and staminate overlapping four days into the period of pistillate receptivity the next. Busseron, Butterick, and Greenriver sometimes had overlaps and sometimes intervals. Reed's conclusion, that "northern varieties of pecan ... appear to be partly or completely dependent upon other varieties for pollen," still holds good, as does his second observation, that "all varieties tend to vary, from year to year with respect to periods of pollen shedding and pistil receptivity." But more records are needed, and any members who have two or more varieties flowering in 1952 can make valuable contributions by taking accurate notes on their habits. There are now newer varieties for which such data are completely lacking, and until more is known, no reliable basis can be had for matching them with the best combinations for adequate cross-pollination.—J. C. McD.
[7] I think the first phase of the suggested experiment has more to recommend it than the second. Perhaps the Round Hill tree gets needed zinc from clotheslines and roofing nails. A more scientific way to apply zinc is to use zinc sulfate in sprays or ground applications, and these are to be used on some trees at Urbana which Dr. Crane diagnosed as zinc-deficient.—J. C. McD.
[8] The Bradley Brothers, who do not court anonymity, are no fellows of the Association or of the University of Illinois. They have been known to sell some kind of grafted pecan trees in recent years, possibly the Stuart or some other variety available from southern wholesale propagators. Mr. Taylor was lucky enough to have his order filled with a southern Illinois seedling which at least is good for the squirrels. We haven't yet seen any All State nuts from Maine or Montana. The Bradley variety is an obsolete southern pecan.—J. C. McD.
Pecans in the Vicinity of St. Paul, Minnesota
Carl Weschcke
About 25 years ago pecan seeds from the most northern natural habitat in Iowa were planted in garden soil here in St. Paul. Most of them were later transplanted in nursery rows at my farm seven miles east of River Falls, Wisconsin. Out of approximately 300 trees, about 40 are still living, of which 25 have grown well. The remainder probably have not found soil conditions to accommodate their natural vigorous growth. Where the trees are in deep soil with sufficient plant food, they have done well, the largest tree being about 10 inches in diameter, and several of these have been bearing nuts for five years. The nuts were immature, however, but in the fall of 1949 about 70 of the best ones were planted in a seed bed and today about 15 living trees of pure pecan parentage represent the second generation.
This evidence is very important, for although the pecan has been almost as hardy as any native tree (such as the bitternut hickory, the butternut and the black walnut), yet the length of season required for the maturing of nuts is a primary factor which would have to be considered in recommending pecans for planting this far north. However, it has been my observation that these pecans have slowly cycled their way into our season, and it is gratifying to notice that this spring many leafed out at nearly the same time that the black walnut vegetated, which of course is much slower than the local butternut. This shows the tremendous adaptability of the pecan, and it is hoped that this ability to adapt itself to soil and climatic conditions will eventually cause it to produce small but edible pecans here in the north.