Grafting and Adventitious Root Formation of Texas Field Rose Bushes.

by Fred T. Davies, Jr., C. E. Hambrick III, Y. Fann, and H. B. Pemberton

New techiques are needed to reduce the 2-year production cycle and increase the yield of Texas Field Rose Bushes. There are advantages in simultaneously bench chip budding and rooting. Chip budding was successful using both hand technique and a Liliput grafting tool, while parafilm strips were the most effective graft wrapping material. In a second study, it was shown that if the use of dormant, unrooted bench chip budded grafts is to be successful, the correlative unhibition of rootstock axillary buds on chip budded scions must be broken soon after grafted cuttings have rooted to maximize scion development and reduce production time. Girdling and forcing treatments effectively broke epical dominance imposed by rootstock shoots when compared to control. In a third study, experiments were conducted to improve uniformity of rooting of Rosa multiflora 'Brooks 56' hardwood cuttings. Selected chemical and mechanical pretreatments were tested on the rooting of dormant hardwood Rosa multiflora cuttings under commercial, nonirrigated field conditions of east Texas and under intermittant mist in a glasshouse. Best treatments were with Hare's Powder and wounding, while acid, base and IBA treatments did not enhance rooting. In a fourth study, experiments were conducted to test optimum physiological conditions for selecting cuttings were harvested during the year and tested for rooting response, and correlated with Carbohydrate/Nitrogen ratios. Basal cuttings were superior to apical under glasshouse rooting assays. Under field conditions during Janurary, basal and medical cuttings were superior to apical cuttings. There was a trend of lower nitrogen and soluble carbohydrates and higher starch in basal vs. apical cuttings.

Acta Horticulturae 189, 1986.