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Abstract
‘Loring’ peach trees (Prunus persica (L.) Batsch) were treated with a 1% thiourea + 2% KNO3 (TUK) mixture during “late rest” when 589 chill units had accumulated and 1 week following rest completion, when 691 chill units had accumulated. Applications made during “late rest” terminated rest of both flower and lateral vegetative buds before the control and significantly reduced growing degree hour celsius (GHD°C required for bud break. Applications of TUK a week later resulted in a significant reduction in GDH°C for bud break over the control. The late treatment was intermediate between the control and the earlier treatment for bloom date and GDH°C accumulation.
Abstract
Thiourea (TU) at 0.5 or 1% in combination with KNO3 at 2% sprayed on peach trees (Prunus persica (L.) Batsch cv. Washington) with delayed dormant symptoms 1 month after full bloom failed to alleviate the prolonged dormant conditions, were phytotoxic to the foliage, and resulted in severe aberrant fruit.