Search Results
You are looking at 1 - 10 of 14 items for :
- Author or Editor: G.A. Couvillon x
- HortScience x
Abstract
Semi-hardwood peach cuttings of 13 cultivars of peach (Prunus persica (L.) Batsch) collected in 2 locations were successfully rooted and transplanted to the field. Rooting was influenced by indolebutyric acid (IBA) concentration and basal wounding.
Abstract
The rabbiteye blueberry, V. ashei, is planted to a limited extent in the Southeast, although it is adapted to an area extending from Virginia to Texas. The difficulty in propagating the species is one factor limiting the planting of improved selections (1). Many factors are known to influence root initiation and development in cuttings of rabbiteve, lowbush, and highbush blueberry species (2,4,5,7,8,9,10), but the effect of extended photoperiods on the rooting of the rabbiteye species is lacking. This study was conducted in 1963 and 1964 to investigate the effect of photoperiod and IBA on the rooting of cuttings of the rabbiteye blueberry, ‘Woodard’.
Abstract
Evaporative cooling (EC) of nectarine buds [Prunus persica (L.) Batsch] during rest by overhead sprinkling when day temperature exceeded 16°C lowered bud temperature in bright days by 3° to 5°C. EC resulted in an enhanced break of vegetative and floral buds.
Abstract
‘Loring’ peach trees (Prunus persica (L.) Batsch) were treated with a 1% thiourea + 2% KNO3 (TUK) mixture during “late rest” when 589 chill units had accumulated and 1 week following rest completion, when 691 chill units had accumulated. Applications made during “late rest” terminated rest of both flower and lateral vegetative buds before the control and significantly reduced growing degree hour celsius (GHD°C required for bud break. Applications of TUK a week later resulted in a significant reduction in GDH°C for bud break over the control. The late treatment was intermediate between the control and the earlier treatment for bloom date and GDH°C accumulation.
Abstract
Thiourea (TU) at 0.5 or 1% in combination with KNO3 at 2% sprayed on peach trees (Prunus persica (L.) Batsch cv. Washington) with delayed dormant symptoms 1 month after full bloom failed to alleviate the prolonged dormant conditions, were phytotoxic to the foliage, and resulted in severe aberrant fruit.
Abstract
Unrooted hardwood cuttings of ‘Harvester’, ‘Redhaven’, and ‘Bicentennial’ peach [Prunus persica (L.) Batsch] were planted directly in the field. Survival decreased with planting dates from November to January. Basal wounding increased survival of all cultivars. Survival of cultivars varied significantly.
Abstract
Softwood cuttings taken from phony peach disease-infected and uninfected trees of ‘Jefferson’ peach [Prunus persica (L.) Batsch] produced 80% or more well-rooted cuttings with no significant difference (5% level) between phony and non-phony cuttings.
Abstract
‘Redhaven’ peach (Prunus persica (L.) Batsch) that were in rest were exposed for 96 hours to 2.5, 5, 10.5, or 21% O2. A second group was exposed to 2.5% O2 for 1, 2, 4, or 6 days. Bud break was enhanced only by 2.5 or 5% O2. Rest release was also influenced by the duration of exposure to low O2. Plants exposed for 2, 4, or 6 days to 2.5% O2 showed faster bud break than did those exposed to the same concentration for 0 or 1 day.
Abstract
Energy dispersive X-ray analysis of Ca and K was conducted in apple (Malus domestica Borkh.) leaves. Larger amounts of Ca and K were detected in the xylem than in the mesophyll tissue. The X-ray images of both the elements increased in intensities in samples from trees receiving gypsum and foliar sprays with CaCl2. Conversion of the X-ray images into graphical data produced a better quantitative comparison of element concentrations. The range of Ca concentration in the xylem of 206 to 350 ppm compared favorably with that reported in the literature for xylem sap of assorted tree species, including apple trees.
Abstract
A method for obtaining small (15-25 cm) plants of peach [Prunus persica (L.) Batsch] with all bud types present was developed by rooting peach cuttings following flower bud initiation. These small plants permit studies to be carried out in controlled-environmental chambers. The rest and dormancy periods of the rooted cuttings were similar to large field-grown trees of the same cultivar.