Search Results

You are looking at 1 - 9 of 9 items for :

  • Author or Editor: K. Uriu x
  • HortScience x
Clear All Modify Search

Chloride and boron toxicity symptoms and tissue concentrations were characterized and distinguished in kiwifruit. Dormant cane, bud, emerging leaves, blade and petiole samples were taken from February through October 1989 from three vineyards - a high chloride, a high boron and a low boron, low chloride control. Chloride toxicity symptoms started showing in early summer on basal leaves. By late summer, necrosis symptoms were on mid-shoot and leaves near the shoot terminal. In boron toxicity, interveinal chlorotic areas appeared first followed by marginal necrosis. Symptoms were seen on basal leaves in early spring, progressively affecting upper leaves by harvest. The high chloride vineyard accumulated chloride from early spring with the petiole concentrating more chloride than the blade. In the high boron vineyard, boron increased greatly in the blade but not in the petiole. Another sampling procedure other than mid-season leaf samples could be emerging leaves for detecting high chloride and dormant cane tips, buds or emerging leaves for high boron.

Free access

Boron(B) deficiency in almond (Prunus dulcis Mill.) is characterized by leaf tip scorch, leaf drop, twig dieback, brown gummy areas in the endocarp, and embryo abortion followed by nut drop in May. Additional symptoms revealed by our work include failure of flowers to set nuts and lateral bud drop. Lack of production in part or in all of the free canopy causes spurs to elongate leading to a “willow twig” symptom on the small fruitwood. This can be confused with the nonproductive “bull” syndrome or with virus bud failure (ABFV or PRSV). Comparative leaf, pericarp, or kernel analysis in May gave a better indication of low B than did leaf analysis in August. In August, analyzing the hulls (mesocarp and exocarp) gave better separation between deficient and adequate trees than did leaf, kernel, or shell analysis. B critical levels for almond leaves should be re-evaluated since deficiency symptoms occur at currently accepted “adequate” levels.

Free access

Abstract

Withholding irrigation of walnut trees (Juglans regia L. cv. Ashley) for one growing season significantly reduced trunk growth and kernel weight. Tree survival and return cropping were unaffected. When irrigation was resumed kernel weight was significantly heavier than that from trees irrigated the previous year.

Open Access

Abstract

Fruit growth and final size were greater on lightly cropped than on moderately heavily cropped cherry (Prunus avium L. cv. Buriat) trees. A wax-based antitranspirant (AT), sprayed 1 week before harvest, increased fruit size on both lightly and moderately heavily cropped trees. Although the lightly cropped AT-treated trees had the largest fruit at harvest, the response to AT was greatest on the moderately heavily cropped trees. Thus, AT can improve fruit grade-size, and probably monetary returns, particularly on heavily cropped trees. High rates of AT application, however, can adversely affect fruit appearance.

Open Access

Abstract

An antitranspirant film was used as a research tool to determine which part of the sweet cherry (Prunus avium L.) fruit is the principal path for absorption of external water (rain). Antitranspirant applied to the entire fruit surface reduced water intake to half that of control fruit or fruit treated only on the top and/or bottom. A preliminary field trial investigated the film’s “rain-coating” effect as a possible means for reducing cherry cracking.

Open Access

Abstract

A firm-forming antitranspirant sprayed on trees of ‘Halford’ and ‘Vivian’ cling peach [Prunus persica (L.) Batsch] 1-2 weeks before harvest, increased fruit growth and substituted for a preharvest irrigation. Such replacement of the final irrigation can enable timely entry of harvest equipment to the orchard, unhampered by a wet soil surface, without a reduction in fruit growth.

Open Access

Abstract

Maleic hydrazide (MH) was readily translocated in the apricot tree, as indicated by inhibition of shoot growth and seed abortion in the fruits. However, cambial activity was undisturbed, and trunk growth proceeded normally.

Open Access

Abstract

A film-forming antitranspirant sprayed on trees of olive (Olea europa L. cv. Sevillano) increased equally the growth of bagged (to prevent spray contact) and unbagged fruit. Hence, enhanced fruit growth depends upon film formation on stomata-bearing leaf surfaces, rather than direct contact of fruit by the spray.

Open Access

Abstract

Ground application of urea increased yields of ‘Nonpareil’ almond (Prunus amygdalus Batsch) by increasing the number of flowers per tree rather than by increasing blossom receptivity and percentage fruit-set. Hand pollination of flowers on caged limbs indicated that blossom receptivity declined between 3 and 6 days after anthesis.

Open Access