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Successful control of apple scab with hydrated lime

Grimm-Wetzel, Peter and Schönherr, Jörg (2006) Successful control of apple scab with hydrated lime. [Erfolgreiche Bekämpfung des Apfelschorfs mit Kalziumhydroxid.] In: Boos, Markus (Ed.) Ecofruit - 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 31st January to 2nd February 2006 at Weinsberg/Germany, pp. 83-86.

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Summary

In an attempt to control scab, a 12-year-old apple orchard was treated with suspensions of 5 g/l hydrated
lime (Ca(OH)2) using overhead irrigation for 15 min. No other fungicides were used. In treatment A, irrigation
was started when infection according to Mills had taken place. In treatments B and C, treatment was delayed
by 6 h and 20 h, respectively. Irrigation was initiated when the scab warning system signaled even very low
infection risk, and a total of 62 treatments were applied. At harvest, the fruits of ‘Golden Delicious’ and
‘Jonagold’ varieties of untreated controls were scabbed, while those of ‘Elstar’, ‘Fiesta’, and ‘Kent’ had no
visible scab symptoms. During both conventional and ULO storage for 7.5 months, all control fruits
developed scab symptoms. All fruits from A, B, and C treatments were free of scab at harvest and after
storage. All control trees had scabbed leaves at harvest time; treated trees were free of scab on their upper
leaf surfaces, while up to 15% of the leaves had at least one scab lesion on their lower surfaces. This was
attributed to poor wetting of these surfaces by sprinkler irrigation, while the fruits and upper leaf surfaces
were fully covered with hydrated lime suspensions. At harvest, leaves and fruits were covered with whitish
calcium carbonate residues which could be removed by a brief dip in 20 g/l aqueous citric acid. There were
no signs of phytotoxicity on either leaves or fruits.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Schorf, Fungizide, Kalziumhydroxid
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries
Research affiliation: International Conferences > 2006: Ecofruit
Related Links:http://www.ecofruit.net
Deposited By: Tagung, Ecofruit
ID Code:13798
Deposited On:18 Sep 2008
Last Modified:12 Apr 2010 07:37
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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