Table 2.

Heat requirements and flowering date of two peach cultivars as affected by autumn-applied ethephon.

Cultivar	Treatment	HR X	Flowering (F50) y	Days z
Redhaven (P. persica)	Control	4682	23 March	60	a
	ET-100 ppm	4927	26 March	63	ab
	ET-300 ppm	5260	28 March	65	b
	ET-500 ppm	5583	29 March	66	b
Sunhigh (P. persica)	Control	4960	24 March	61	a
	ET 10%	5842	30 March	67	b
	ET 50%	5656	29 March	66	b
	ET 100%	5543	28 March	65	b

^X Heat requirements (HR) is displayed as the number of growing degree hours (GDH). ^Y Date at which 50% of buds were at the open-blossom stage (F₅₀). ^z Number of days after breaking of endodormancy until flowering (F50). All comparisons are made within each cultivar with significant level at 0.05, and significant differences apply to both CH and Days.