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  • Author or Editor: Stuart Hemstreet x
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Abstract

Lateral spread of iceplant (Carpobrotus edule L. Bolus) was best reduced by sprays of 2-chloro-9-hydroxyflou-rene-9-carboxylic acid (chlorflurenol) at 300 ppm; other chemicals tested were ineffective. Addition of 0.1% X-77 adjuvant often improved growth reduction. Greater growth reductions from second treatments suggest an advantage for a continuing spray program.

Open Access

Abstract

Foliar applications of 2, 3, 4, 6-di-o-isopropyl-idene-2-keto-L-gulonate (dikegulac) at rates of 0.2-0.3% resulted in growth reductions comparable with l,2-dihydro-3,6-pyridazinedione (MH) or methyl-2-chloro-9-hydroxyfluorene-9-carboxylate (chlorflurenol). Where terminal leaf abscission occurs, tree appearance after treatment is sometimes better than that of trees treated with either MH or chlorflurenol. Growth reduction from trunk banding with dikegulac n-pentyl ester was observed only on Ulmus parvifolia Jacq.; chlorflurenol in trunk banding has a much wider species range and is effective at lower concn.

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