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  • Author or Editor: D. E. Wuertz x
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Abstract

American elm (Ulmus americana L.) and American sycamore (Platanus occidentalis L.) trees were injected in May or June 1974 and 1975 with water solutions of 1,2-dihydro-3,6-pyridazinedione (Maleic hydrazide, MH) and butanedioic acid mono-(2,2-dimethylhydrazide (daminozide). Measurements in 1977 showed sprout length to be significantly reduced by both chemicals applied in 1974. Of the 1975 treatments, only MH-treated sycamore still showed significant sprout length reduction 3 growing seasons after injection. Between April and June 1977, MH and the sodium sait of 2,3:4,6-bis-0-(1-methylethylidene)-α-L-xylo-2-hexulofuranosonic acid (dikegulac) were injected into the trunks of previously topped American sycamore, silver maple (Acer saccharinum L.), red oak (Querem rubra L.), shamel ash (Fraxinus uhdei (Wenz.)Lingelsh), and eucalyptus (Eucalyptus globulus Labill.). Both chemicals significantly reduced regrowth, but high concentrations were generally more effective than were low concentrations of the same chemical. However, high concentrations of dikegulac were likely to cause unfavorable foliar appearance, including leaf distortion and dieback. Regrowth control was generally similar for a species treated with the same chemical at different geographical locations. Average injection cost for a single treatment is estimated at $2 to $3 per tree.

Open Access

Abstract

Water solutions of commercial formulations of growth regulators were pressure-injected into the trunks of topped American elm (Ulmus americana L.) trees in June to evaluate their ability to reduce sprout regrowth. Regrowth was significantly reduced by methyl 2-chloro-9-hydroxyfluorene-9-carboxylate (chlorflurenol), N-[4-methyl-3-[[(trifluoromethyl)sulfonyl]amino] = phenyl]acetamide (fluoridamid), l,2-dihydro-3,6-pyridazine-dione (maleic hydrazide), succinic acid,2,2-dimethylhydrazide (daminozide) and 2,3,5-triiodobenzoic acid (TIBA); α-cyclopropyl-α-(4-methoxypenyl)-5-pyrimidine = methanol (ancymidol) and (2-chloroethyl)trimethyl-ammonium chloride (chlormequat) were ineffective. Some undesirable effects on the tree and foliage were observed. Maleic hydrazide (MH) and daminozide (SADH) were selected for additional field tests at 3 concentration levels on topped American elm and American sycamore (Platanus occidentalis L.). Regrowth was significantly reduced and foliage condition was acceptable for the high concentration of SADH and the low concentration of MH. Successive measurements in both experiments showed that sprout regrowth was reduced by an amount equivalent to at least 1 year of growth during the first 2 seasons following treatment.

Open Access