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Abstract
All fungicides applied as dips to polyurethane propagation cubes prior to propagation of poinsettia (Euphorbia pulcherrima Willd.) cuttings inhibited rooting at the concentrations employed. Least inhibition of rooting resulted from dips containing (per liter) either 37 mg metalaxyl [N-(2,6 dimethylphenyl)-N-(methoxyacetyl) alanine methyl ester] 25 WP plus 300 mg ferbam (ferric dimethyldithiocarbamate) 76 WP, 500 mg ferbam 76WP, or 599 mg benomyl [methyl l-(butyl-carbamoyl)-2-benzimidazole-carbamate] 50 WP. Treatments containing fenaminosulf (p-dimethylaminobenzenediazo sodium sulphonate) 35 WP inhibited rooting most. The PCNB (pentachloronitrobenzene) 75 WP treatment also caused low root counts.
Abstract
Cuttings of poinsettia (Euphorbia pulcherrima Willd.) treated with a basal dip of 0.1% indolebutyric acid (IBA) alone (control) or in combination with 5% ferbam (ferric dimethyldithiocarbamate), benomyl [methyl 1-(butyl-carbamoyl)-2-benzimida-zole-carbamate], metalaxyl [N-(2,6-dimethylphenyl)-N-(methoxyacetyl) alanine methyl ester], PCNB (pentachloronitrobenzene), and ethazol (5-ethoxy-3-tricloromethyl-l,2,4-thiadiazole) did not differ in rooting index or weight. Increasing the percentage of fungicide above 5% generally reduced rooting. However, rooting was similar to the control with combinations of ferbam at 5% to 67% or metalaxyl at 20%. Fenaminosulf (p-dimethylaminobenzenediazo sodium sulfonate) at 5% to 67% reduced rooting.