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  • Author or Editor: S. B. Boswell x
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Abstract

Sprays of a synthetic cytokinin, 6-(benzylamino)-9-(2-tetrahydropyranyl)-9H-purine (PBA), applied to seedlings of Macadamia tetraphylla L. in the greenhouse resulted in sprouting of axillary buds, and reduced growth of the terminal shoot. Terminal removal caused lateral shoot development in more seedlings than PBA.

Open Access
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Abstract

Newly budded trees of ‘Valencia’ orange [Citrus sinensis (L.) Osbeck] on rough lemon (C. jambhiri Lush.), alemow (C. macrophylla Wester), Troyer citrange (Poncirus trifoliata Raf. ⨯ C. sinensis), and P. trifoliata were sprayed with 2 concentrations of naphthaleneacetic acid (NAA) to inhibit rootstock sprouting, buds being protected with budding tape. Good control of rootstock sprouts was obtained on rough lemon and P. trifoliata but translocated NAA inhibited scion bud initiation. There was partial suppression of rootstock sprouts on Troyer citrange but no scion bud inhibition. NAA did not control rootstock sprouts on alemow.

Open Access
Authors: and

Abstract

Naphthaleneacetic acid (NAA) sprayed as a 1% ethyl ester or sodium salt formulation below the grafts effectively controlled trunk and limb sprouts on topworked fig trees (Ficus carica L.). Reduction of scion growth and numbers of sprouts on unsprayed portions of grafted limbs indicated translocation of NAA for a distance of at least 10 cm.

Open Access
Authors: and

Abstract

Application of 6-benzylamino purine (BA) to quiescent citrus buds generally increased the percentage of buds to initiate active growth. Results of 2 years’ experimentation were highly variable and revealed several factors, such as season and cultivar, which influence the efficacy of BA for stimulating citrus buds into growth. BA was more effective outdoors and in a screenhouse than in a greenhouse. There was appreciable variation among several citrus cultivars. Early spring applications in a commercial citrus nursery were more effective than late spring or summer applications with ‘Owari’ satsuma (Citrus reticulata Blanco) budded on Troyer citrange (Ponci-rus trifoliata [L.] Raf. × C. sinensis [L.] Osbeck) rootstock.

Open Access

Abstract

Painting of inhibitors on pruning cuts reduced growth only in the area proximal to treatment in Eucalyptus globulus Labill. Sprays of 0.2 to 0.3% 1-propylphosphonic acid (NIA 10656) or injection of 8 ml of 10% tech grade NIA 10656 gave shoot growth reduction for 1 year. Ethyl hydrogen 1-propylphosphonic acid (EHPP, NIA 10637) showed responses similar to NIA 10656. Naphthaleneacetic acid (NAA), EHPP, NIA 10656 and amonium ethyl carbamoylphosphonate (Krenite) all showed certain growth regulator responses when painted on pruning cuts. Inhibitors applied in an asphalt carrier to cuts were more effective than similar applications in a water carrier. Application of 6, hydroxy-3-(2H) pyridacinone (MH), trifluromethyl sulfonamido-p-acetotoluidide (Sustar), NAA and EHPP combination, or methyl 2-chloro-9-hydroxyfluorene-9-carboxylate (chlorfluernol methyl ester, principal active ingredient in Maintain CF 125) were tested as trunk bark bands for reduction in terminal shoot growth. The Maintain CF 125 product diluted with an equal amount of diesel oil and applied in a band equal to the trunk diameter of E. camaldulensis Denhardt effected a reduction in terminal growth 11 months after banding. Maintain CF 125 applied at full product strength (12.5%) or diluted equally with water and the other inhibitors tested did not cause growth reduction.

Open Access

Abstract

Ammonium sulfamate (Animate X) gave the best results for controlling resprouting of tree stumps of avocado (Persea americana Mill.).

Open Access

Abstract

A 1% ethyl ester or sodium salt formulation of naphthaleneacetic acid (NAA) in 30% aqueous solution of white latex paint sprayed below the grafts effectively controlled trunk sprouts in topworked avocados (Persea americana Mill). Regrowth was suppressed over a 7-month growing period with no adverse effects on the grafts.

Open Access

Abstract

Application of 6-(benzylamino)-9-(2-tetrahydropyranyl-9H-purine (PBA); 6-benzylamino purine (BA); and ethyl 5-(4-chlorophenyl)-2H-tetrazole-2-acetate (PP528) to seedlings of Macadamia tetraphylla L. in the greenhouse resulted in sprouting of axillary buds. PBA and BA were more effective than PP528. No axillary buds sprouted on untreated seedlings.

Open Access

Abstract

Naphthaleneacetic acid (NAA) applied to young ‘Washington’ navel orange trees [Citrus sinensis (L.) Osbeck] as a 1% sodium salt or ethyl ester formulation was translocated from the treatment site and inhibited growth of the untreated portion of the tree. The Na salt formulation translocated farther than the ethyl ester formulation.

Open Access

Abstract

Herbicides, growth regulators, and polyethylene plastic tarpaulins were applied or covered 14-year-old ‘Frost Valencia’ sweet orange [Citrus sinensis (L.) Osbeck] on Troyer Citrange [Poncirus trifoliata (L.) Raf. × Citrus sinensis (L.) Osbeck] stumps to control sprouts. Ammonium sulfamate (Ammate X), 2,4-D Esteron Ten Ten, 2,4-D Lithate, ammonium ethyl carbamoylphosphonate (Krenite), and polyethylene plastic tarpaulin gave best results for controlling resprouting.

Open Access