Horticulture Research Station

Thinning Scab-resistant Apples with Liquid Lime Sulfur Sprays during Bloom

Authors: Paul A. Domoto (Iowa State University) , Dennis Katuuramu (Iowa State University) , Gail R. Nonnecke (Iowa State University) , Lynn R. Schroeder (Iowa State University)

  • Thinning Scab-resistant Apples with Liquid Lime Sulfur Sprays during Bloom

    Horticulture Research Station

    Thinning Scab-resistant Apples with Liquid Lime Sulfur Sprays during Bloom

    Authors: , , ,

Abstract

Growing scab-resistant apple cultivars on fully dwarfing rootstocks increases the feasibility for producing organically grown apples in the Midwest. However, in an organic orchard, fruit thinning to optimize crop load must be done by hand at a very high labor expense. The alternative is biennial bearing and inconsistent supply to meet consumer demands. Recently, sprays containing organicapproved materials such as liquid lime sulfur, fish, and various vegetable oils, salts, and kaolin have been tried alone or in combination for thinning apples with some degree of success. Lime sulfur alone or in combination with spray oil was recently labeled for use in Washington state orchards. This study was undertaken to evaluate the effectiveness of liquid lime sulfur alone and in combination with spray oil applied at various times during bloom on thinning three scab-resistant apple cultivars under Iowa conditions.

Keywords: RFR A1113, Horticulture

How to Cite:

Domoto, P. A., Katuuramu, D., Nonnecke, G. R. & Schroeder, L. R., (2012) “Thinning Scab-resistant Apples with Liquid Lime Sulfur Sprays during Bloom”, Iowa State University Research and Demonstration Farms Progress Reports 2011(1).

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Published on
01 Jan 2012
Peer Reviewed