Exp. No. 8. Aug. 2nd. Papaw tree. Two greens on green, two greens on old wood. Sept. 9th. Two greens on green have buds enlarged and ready to burst. One green on old wood is not enlarging its buds. One green on old wood is dead.
Exp. No. 9. Aug. 2nd. English walnut. Four greens on green. Sept. 9th. Leaflets dead on all. Petiole dead on one, stem cambium green. Petioles bright green on three and the cambium green on these.
Comment. I could not take daily notes which would have been very important. A general statement will cover the point that the terminal leaf on a scion seldom died until it had functioned for at least a week. Some of them functioned for more than two weeks and one of them for at least four weeks, failing only a day or two ago. This would seem to mean that the terminal leaves in scions conducted or helped to conduct repair in green graft wounds to a point where buds are now bursting on two persimmon scions. Two pawpaw scions have enlarged buds to the point of bursting. The terminal leaves on scions seemed to conduct repair up to a point where lignifying for the winter is now going on. This cannot be determined until winter passes but I have never obtained anything like this effect until experimenting with the terminal leaf theory for the first time this year. The most striking effect so far as appearance goes is with the English walnut grafts with their bright green stems.
If I may have opportunity for conducting experiments next summer I shall begin earlier by pinching off the buds of growing shoots, giving them a week of rest and then cutting these shoots up into scions. If buds then start off like those of two persimmons and two papaws they will have time for lignifying.
My whole lesson of this season would seem to mean that after properly checked experiments we may perhaps add what I call "green grafting" to the other form of immediate grafting. The practical feature of this whole new phase in grafting method is an extension of the grafting season to include every month of the year. Scion grafting of perennials in the latitude and longitude of Connecticut had formerly been confined to about two month's in the farmer's rush season, and with general failure in the grafting of some species which may now be grafted successfully.
Letter from Prof. Colby
Agricultural Experiment Station Urbana, Illinois
I regret very much indeed that I cannot attend the meeting of the Nut Growers Association this year. This letter bears my very best wishes and hopes for a successful meeting. We shall miss Mr. Bixby's pleasing and helpful personality. Some time ago I promised to give you a report on some of our activities here and if you think it is worth while, I would appreciate your reading it to the group.
There is an increasing interest in nut culture in Illinois. Wholly aside from the commercial aspects which have been so profitably developed in southern Illinois is a project of recent development, one in Extension work in top working seedling walnuts and pecans with improved varieties. This project is sponsored by the Department of Horticulture, University of Illinois, and the Extension Forester of the State Natural History Survey, with the cooperation of the County Farm Advisers.