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Freeze Protection in European Pear 2008 Kitren Glozer Department of Plant Sciences, UC Davis Rachel Elkins UCCE, Lake & Mendocino Counties.

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Presentation on theme: "Freeze Protection in European Pear 2008 Kitren Glozer Department of Plant Sciences, UC Davis Rachel Elkins UCCE, Lake & Mendocino Counties."— Presentation transcript:

1 Freeze Protection in European Pear 2008 Kitren Glozer Department of Plant Sciences, UC Davis Rachel Elkins UCCE, Lake & Mendocino Counties

2 Flower buds and cold hardiness  Cold hardiness is reduced by –low chill accumulation –cycling warm and cold periods in dormant season –Delayed entry into dormancy –poor nutritional status  Buds ‘at risk’ have poor vascular connections, lower sink strength, low nutrient status and PGR production

3 4/6 4/7 3/26 Dates of Treatment = tight cluster & 10-20% bloom Killer Freeze Post Petal Fall

4 Cropload rated May 15, after final fruit drop. Application dateRating ProGibb + Promalin + BlightBanApril 62.0 a ProGibb + PromalinApril 61.4 ab BioForgeMarch 261.0 ab ProGibb + Promalin+ BlightBan 2xApril 6 & 70.8 b ProGibb + PromalinMarch 260.75 b ProGibb + Promalin 2XApril 6 & 70.6 b ProGibb + DithaneMarch 260.6 b ProGibb + Promalin + BlightBan, before freezeMarch 260.4 b Untreated control0.4 b BlightBanMarch 260.2 b Whole tree treatments, mistblower, 100 gpa, Breakthru penetrant with all but BioForge

5 Most promising results after April 20 freeze ProGibb (GA 3 ) + Promalin (GA 4+7 ) with BlightBan @ early bloom ProGibb + Promalin @ early bloom BioForge (2% N from urea, 3% soluble potash K 2 O) – only timing tested was @ tight cluster ProGibb + Promalin @ tight cluster Most of crop was lost to late freeze Return bloom and yields from 2008 treatments will be evaluated in 2009 Trial will be repeated in 2009

6 Acknowledgements Our appreciation to our grower-cooperator and to the California Pear Advisory Board for ongoing support


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