Al Kovaleski September, 2013 Effect of timing and intensity of summer pruning on vegetative and reproductive traits of southern highbush blueberry University.

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Presentation transcript:

Al Kovaleski September, 2013 Effect of timing and intensity of summer pruning on vegetative and reproductive traits of southern highbush blueberry University of Florida Horticultural Sciences Department

Blueberry summer pruning 2 No removal of flower buds Long growing season in FL Pruning promotes increased vigor More support for reproductive structures

Objectives 3 Determine the effects of timing and severity of summer pruning: Vegetative traits: Plant volume Regrowth Timing of defoliation Incidence of leaf spots Incidence and severity of stem blight Reproductive traits: Flower bud initiation Fruit set Yield Quality of fruit

Plant material 4 Two cultivars ‘Emerald’ and ‘Jewel’ Six year old plants Commercial cultural practices PSREU – Citra, FL

Treatments 5 No summer pruning control Prune 30% early June Prune 30% mid-July Prune 30% early June+tip Prune 60% early June+tip Detailed hand pruning control

Treatments 6 30%60%Unpruned

Vegetative traits 7 Canopy volume Regrowth Condition of fall foliage Time of defoliation Leaf spot

Vegetative traits 8 Incidence and severity of Stem Blight

Reproductive traits 9 Re-growth shoots collected to assess timing of flower bud initiation – Late summer until defoliation

Reproductive traits 10 Harvest Period Yield Fruit quality Total soluble solids Titratable acidity Firmness Average berry weight picturesbychristopher.wordpress.com Labmate-online.com

R ESULTS TO DATE 11

Canopy volume - Emerald 12 Treatment Winter volume (m 3 ) Non-pruned1.26a Hand pruned1.06b 30% June1.01bc 30% June+tip0.91c 60% June+tip0.68d 30% July0.91c

Regrowth volume - Emerald 13

Flower bud initiation 14 Important to: Develop management strategies to enhance flowering Regulate fruit load First sign of transition detectable

Flower bud initiation 15

Flower bud initiation 16

Flower bud initiation 17 No differences between treatments Emerald – Sep 8 th Jewel – Oct 20 th

Leaf spots - Jewel 18 Treatment Leaf spot incidence (%) Nov1 Dec21 Dec 25 Oct8 Nov23 Nov11 Dec Non-pruned70.0a78.8a57.6ab38.3a81.7a88.3a97.5 Hand pruned33.3b25.4b54.3ab31.7a56.7bc78.3bc % June43.3ab48.8ab50.9b35.0a61.7b83.3ab % June+tip36.7b48.8ab64.3ab26.7ab53.3bc81.7abc % June+tip36.7b52.1ab84.3a15.0b53.3bc73.3c % July66.7a82.1a67.6ab 15.8b41.7c78.3bc94.2

Treatment z Defoliation (%) Dec21 Dec 25 Oct8 Nov23 Nov11 Dec Non-pruned15.0ab y 37.4ab21.7a27.5a68.3a95.0a Hand pruned0.0c30.8b4.2ab13.3b31.7b80.0abc 30% June6.7bc27.4b10.0ab10.0b36.7b81.6abc 30% June+tip5.0bc34.1ab6.7ab11.7b36.7b86.6ab 60% June+tip5.0bc52.4a0.0b6.7b25.0b71.6c 30% July20.0a50.8a 4.2ab13.3b35.0b80.0bc Defoliation - Jewel 19

Stem blight 20 Jewel was not affected No differences among treatments in Emerald

Berry quality 21 Average weight - Jewel Reduction in the 60%+tip 2g  1.5g Others averaged 1.7g pH, acid and sugar content, anthocyanins, firmness No differences

Yield - Emerald 22 Treatment Yield (lbs) Total Periods 1234 Non-pruned14.4 NS 5.0a6.2 NS 2.2 NS 0.7 NS Hand pruned ab % June ab % June+tip ab % June+tip b % July b

Yield - Jewel 23

Yield - Jewel 24

Acknowledgements 25 Dr. Darnell and Dr. Williamson Dr. Olmstead and Dr. Harmon Florida Department of Agriculture and Consumer Services

26 Thank you!