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Nut Kernel Kernel
Rank Entry Name and Address Weight Weight Per-
centage
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1 No. 1 Ray McKinster, 1632 S. 4th St.,
Columbus 7, Ohio 12.9 6.8 52.7
2 Hansen S. M. Shessler, RFD, Genoa, Ohio 8.8 5.2 59.6
3 Jacobs S. M. Shessler, RFD, Genoa, Ohio 12.8 6.0 46.8
4 S-66 Benton & Smith Nut Tree Nursery,
Rt. 2, Millerton, New York
5 S-XD Benton & Smith Nut Tree Nursery,
Rt. 2, Millerton, New York 15.6 7.1 45.8
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To obtain information on the culture of hardy Persian walnut a questionnaire was sent to members known to have experience with ~Juglans regia~. The following information, based on the reports of thirteen growers, should prove valuable to those interested in testing Persian walnut.
The members contacted are testing 35 named varieties in addition to many seedlings. Of the varieties, Broadview appears to be represented in more plantings than any other variety. Gilbert Becker (Michigan) has most of the named Crath selections in addition to seedlings. H. F. Stoke (Virginia) has a large assortment of Crath and other Persian varieties. Fayette Etter (Pennsylvania) reports that he has approximately 150 Persian walnut trees while Royal Oakes (Illinois), Sylvester Shessler, and Gilbert Becker each report 60 trees. Many others have from 25 to 40 grafts or trees while Ray McKinster has only one seedling Carpathian which took top honors in the contest. Most of these members have been testing Persian varieties for more than 13 years. Mr. Stoke has some trees 20 years old.
~Yields~—Most trees reported on began bearing at five to eight years. Topworked trees start bearing several years sooner. It is generally agreed that Persian varieties bear annually. Many trees are bearing only small nut crops. Lack of pollination is given as a reason for these low yields. In addition, winter injury and spring frosts can seriously reduce nut crops. Apparently, none of the trees have borne more than a bushel of nuts at 12 years of age. Accurate records of nut crops were generally lacking. Since this is a very important factor in the selection of varieties, growers should keep accurate yield records for each variety. Where pests are a factor in reducing final yield, a crop estimate should be made early in the season.
~Varieties~—Mr. Stoke considers Bedford, Broadview and Lancaster best under his conditions. Mr. Becker's choice is McDermid but he thinks Crath No. 1 a potential commercial variety. Mr. Oakes likes Crath No. 1 and Ill. No. 3. Mr. Etter lists Burtner and Alleman as his best varieties. Mr. Fateley especially favors one tree because of nut and bearing qualities. Other growers have not as yet evaluated their varieties.
~Hardiness~—Only several growers in the colder regions felt that lack of winter hardiness was a serious limiting factor with their varieties. Those with winter temperatures ranging from 10 to 23 degrees below zero report little damage. Spring frosts are serious to many, especially in the southern states.
~Pests~—Several insects causing damage to Persian walnut were reported. The butternut curculio was most frequently mentioned. Others included leaf hoppers, tent caterpillars, and husk maggots. Few effective control measures have been developed. Squirrels are an ever present threat to nut crops in some localities, as are blackbirds.
~Cultural Practices~—Most growers apply varying amounts of fertilizer or manure to their trees in some form or other. Few mulch their trees. All do some pruning, mainly of a corrective nature.
~Pollination~—Most growers agree that usually, but not always, pistillate flowers are produced several years before the occurrence of catkins. Generally, Persian varieties do not adequately pollinate themselves but exceptions are reported. The problem is one of variable dichogamy. Some varieties shed pollen before pistillate flowers are receptive; others shed pollen when pistillate flowers are no longer receptive. This unfortunate situation probably explains the low yields experienced by some growers. Mr. Stoke lists the flowering dates of 13 varieties in the 1942 NNGA Annual Report which clearly illustrates dichogamy in Persian walnut.
Some varieties are considered sufficiently self-pollinating to produce at least light crops. However, this may be influenced by weather conditions. During an unusually warm spring catkins develop more rapidly than terminal growth containing the pistillate flowers. Mr. Stoke reports that ~Bedford~ produces both flowers simultaneously and that ~Caesar~ is practically self-pollinating. Mr. Etter finds ~Burtner~ fully self-pollinating and ~Alleman~ partially. Mr. McKinster's tree is apparently self-pollinating.