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  • Author or Editor: C. E. Chaplin x
  • Journal of the American Society for Horticultural Science x
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Abstract

Cold resistance of current season shoots of ‘Redhaven’ peach in the nursery as affected by 4 rootstocks was determined by electrical conductance. Significant conductance differences were noted on scion due to rootstock effects, and the most effective time for determining this difference appeared to be in early winter. There were significant differences due to late N applications. Late winter determinations showed that rootstock effects tend to diminish except at critical temperatures. There was variance in relative hardiness of stocks from 1 temperature to another or on different dates but, in general, ‘New’ and ‘Harrow Blood’ transmitted more hardiness to scions that did ‘Siberian C’ or ‘Rutgers Red Leaf’. ‘Siberian C’ was generally better than ‘Rutgers Red Leaf’.

Open Access

Abstract

The influence of 3 spacings, 4 rootstocks, and 2 cultivars of apple (Malus domestica Borkh.) on yield, fruit and tree size and mineral composition of leaves during the 3rd through the 6th year of growth in the orchard were investigated. Scion cultivar had the greatest effect on mineral composition; all elements except manganese were significantly different in the 2 spur-type cultivars (‘Goldenspur’ and ‘Redspur’). Trees on Mailing Merton (MM) 106 rootstock produced larger yields than those on other rootstocks, and the foliage was usually among the highest in respect to each nutrient measured. Closely spaced trees had smaller fruit and the least amount of foliar P and K but Ca, Mg, and Mn were high in the same trees.

Open Access

Abstract

Backcrosses and outcrosses of mite resistant strawberry selections and combinations of resistant selfed lines were made. Backcrosses to the resistant parents resulted in intermediate progeny means but they were closer to that of the less resistant parent. Backcrosses to the susceptible parent also resulted in intermediate progeny means but they were close to that of the more resistant parent. Outcrosses gave progenies similar to those of backcrosses but with less spread in resistance. Crosses of certain resistant selfed selections showed almost complete dominance for mite resistance.

Open Access

Abstract

Five clones of strawberries varying in degree of resistance to the two-spotted spider mite, Tetranychus urticae Koch, were grown at four nutrient levels. Foliage samples were analyzed for minerals, amino acids, total sugar and total starch. The plants were infested with this mite and were rated for injury. Nitrogen of clones and treatments showed significant correlation with mite injury at the 0.05 and 0.01 levels respectively. Phosphorus of clones was significantly correlated with mite injury. Mite injury and treatments, but not clones, were significantly correlated when the amino acids classified as non-essential to Tetranychus urticae were considered. Total starch and total sugar of treatments had significant negative correlations with mite damage.

Open Access

Abstract

‘Redhaven’ peaches (Prunus persica L. Batsch) were sprinkled from the end of rest, January 22, 1975, until the time check trees reached full bloom, April 18, 1975. Sprinkling delayed bloom by 15 days. Energy models predicted bloom one day before it occurred in the check trees. Wood temperatures were lowered as much as 6.5°C in sprinkled trees, but no significant difference in wood cold hardiness was observed. Sprinkled fruit buds were more cold hardy than non-sprinkled fruit buds until early March. Non-sprinkled buds were more cold hardy than sprinkled fruit buds in late March. Sprinkling reduced the number of viable buds/m by late March. Analyses of total and reducing sugars and protein showed no significant difference.

Open Access