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- Author or Editor: P. Spiegel-Roy x
Abstract
‘Kochba’ is a high yielding, semi-hard shelled, well-sealed cultivar of almond, with an attractive light colored kernel.
Abstract
In fruit thinning experiments performed during the June, 1970 drop period in mandarin (Citrus reticulata Blanco cv. Wilking), both 200 and 400 ppm naphthalene acetic acid (NAA), applied 6 days before extremely onset of hot weather, increased fruit size without significantly decreasing yield. Under other conditions, NAA sprays did not cause enough additional fruit drop to thin the crop. In 1972, 400 and 600 ppm NAA proved ineffective. A new thinning agent, 1-(α-naphthaleneacetyl)-3,5 dimethyl-pyrazole (TH656) applied at 160 ppm, brought about a significant increase in fruit size without decreasing yield.
Abstract
Avocado pollen was germinated in vitro without recourse to germination on the style. The technique employed involved inclusion of pollen grains in liquid medium of 15% sucrose and minerals and application of 1 or 2 drops on 1% agar plus 15% sucrose and minerals. No germination was obtained on agar plus sucrose without placement of pollen in liquid first. Of the cultivars tested, ‘Ettinger’ and ‘Nabal’ pollen germinated best, and ‘Fuerte’ was the poorest. The optimum temperature for germination was 25° to 27°C. Addition of Ca to the liquid proved beneficial.
Abstract
The storage life of ‘Clementine’ mandarin (Citrus reticulata Blanco) and Poncirus trifoliata (L.) Raf. pollen was effectively extended in an oxygen-free atmosphere. ‘Clementine’ pollen held at 4°C enabled satisfactory germination (20%) up to 7 weeks; a similar rate of germination was maintained after 20 weeks by use of N atmosphere. By combining deepfreeze temperatures (−18°) with either N or CO2 atmosphere for pollen storage, a germination rate of 13% was maintained after 57 weeks. With Poncirus, lower germination rates were obtained (7-9% after 57 weeks), but results paralleled those obtained with ‘Clementine’ mandarin pollen. Poncirus pollen, stored in an oxygen-free atmosphere at −18° for one year, maintained its fertilizing capacity.
Abstract
Alnem rootstocks constitute a series of cultivars of bitter almond (Prunus amygdalus Batch var. amara) resistant to the root-knot nematode Meloidogyne javanica Chitwood. Root-knot nematodes are a great hazard to almond trees in warm climates, especially on light and medium irrigated soils. To the best of our knowledge, no other source of resistance in almond has been reported.
Abstract
‘Dagan’ is a high-yielding, semihard-shelled, well-sealed, highly flavored and uniform cultivar of almond (Prunus amygdalus Batsch), without doubles (Fig. 1).
Abstract
‘Solo’ is a high-shell-out, well-filled, good shaped uniform almond (Prunus amygdalus Batsch) with no doubles (Fig. 1).
Abstract
Breeding methods which are successfully applied in the production of new and superior cultivars of grains and vegetables are often less effective when used with perennial species such as fruit trees. Fruit trees, especially outbreeding species, are highly heterozygous and have remained thus unchanged for generations because of vegetative propagation. These species are characterized by a more or less prolonged juvenile period. Limited available space and high costs involved in maintenance of orchard plots reduce the number of hybrids that can be studied.
Abstract
Resistance to the root-knot nematode (Meloidogyne javanica Chitwood) was established for 7 bitter almond (Prunus amygdalus Batsch. var. amara DC) F1 progenies selected from trees in a heavily infested nursery soil and subjected to repeated inoculations in containers. Resistance was very high; (complete in some open-pollinated progenies) suggesting dominance or the presence of a cytoplasmic factor. F1 hybrid progenies of 2 highly susceptible almond cultivars crossed with ‘Okinawa’ peach showed almost complete dominance of resistance to M. javanica.
Abstract
In a breeding program for table grapes (Vitis vinifera L.) initiated in 1968 at Bet Dagan, Israel, one objective has been to breed large-berried, better-flavored grape cultivars for replacement of ‘Ribier’ (syn. Alphonse Lavallee). A selection with large black berries has been made and named ‘Nava’ (Fig. 1.). The fruit is well-adapted for the fresh market.