TIMING APPLICATION OF HYDROGEN CYANAMIDE (DORMEX) TO PEACH TREES USING A MODIFIED CHILLING MODEL

in HortScience
Authors:
Arlie A. PowellDepartment of Horticulture and National Weather Service, Auburn University, AL 36849

Search for other papers by Arlie A. Powell in
ASHS
Google Scholar
PubMed
Close
and
Karl HarkerDepartment of Horticulture and National Weather Service, Auburn University, AL 36849

Search for other papers by Karl Harker in
ASHS
Google Scholar
PubMed
Close

This multifaceted study was conducted over the past 6 years in Alabama to determine the efficacy of using hydrogen cyanamide to replace lack of chilling in peaches and to develop a working chilling model to allow proper timing of application. Several timings (0%, 25%, 50%, and 75% chilling accumulation) for each chilling level and rates (0%, 0.5%, 1.0%, and 2.0% v/v of 50% hydrogen cyanamide) were evaluated in commercial orchards using replicated studies. It was determined that for Dormex to be effective, 60% to 65% of chilling for the cultivar involved must be accumulated, accompanied by no bud activity beyond bud swell. Rates of 0.5% and 1% v/v of 50% work well with the latter preferred. A computer chilling model was developed to assist growers with proper timing of application.

  • Collapse
  • Expand