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  • Author or Editor: L. H. Fuchigami x
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Abstract

Hydrogen cyanamide or hot-water treatment (47C) for 1 hr at the 250°GS (Growth Stage) effectively broke rest in dogwood buds within 10 to 12 days. At this growth stage, control plants grown at 25/18C (day/night) maintained an LT50 of –25C throughout the 3-week study period, whereas plants treated with H2CN2 or hot water gradually lost hardiness. After 3 weeks at 5/2C (day/night), the control plants hardened to a hardiness (LT50) of –45C, and H2CN2-treated plants maintained an LT50 of –25C. The results demonstrate that the extent of acclimation and deacclimaton of dogwood plants may be influenced by environmental temperatures and rest status.

Open Access

Abstract

A computer model was developed to predict autumn vegetative maturity, end of summer dormancy of red-osier dogwood (Cornus sericea L. syn. Cornus stolonifera Michx.). Empirical equations were developed from growth chamber data and applied to results obtained from lath house grown plants. The model required input parameters of 2-hourly temperatures and daylengths. From the data daily phototemperature values were determined. The empirical model over-estimated the time to maturity of the lath house grown plants by only 4 days, perhaps indicating the need for a more precise measure of the critical photoperiod.

Open Access