University of California

The effect of certain added materials on bordeaux mixture in the control of peach blight and leaf curl


Edwaed E. Wilson

Author Affiliations

Edwaed E. Wilson was Assistant Professor of Plant Pathology and Associate Plant Pathologist in the Experiment Station.

Publication Information

Hilgardia 14(9):491-515. DOI:10.3733/hilg.v14n09p491. August 1942.

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Inthe standard method for controlling peach blight, caused by Coryneum Beijerinckii Oud., bordeaux mixture (10-10-100) is applied to the trees after all leaves are off in the autumn, but before the winter rains begin. Since this is the only application given to protect the twigs against blight during the following three or four months, when heavy and prolonged rains occur, and since this application is also expected to prevent leaf curl caused by Taphrina deformans, success of the control is largely dependent upon resistance of the fungicide deposit to dissipation by atmospheric agencies.

In earlier trials (12),3 bordeaux to which 4 per cent of a dormant petroleum-oil emulsion was added, proved more weather-resistant than bordeaux without oil—results that were in agreement with those of Winston, Bowman, and Yothers (14). In 1936-37 and 1937-38, therefore, further trials were undertaken to determine whether smaller amounts of petroleum oil would reduce the loss of bordeaux from peach twigs as effectively as 4 per cent does, and whether other materials such as cotton seed oil and bentonite were useful in this respect.

The effect of petroleum oil on the toxicity of bordeaux to spores of Coryneum Beijerinckii(13), and on the spray’s “retention”4 and “coverage” qualities were also studied.

Literature Cited

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Wilson E. 1942. The effect of certain added materials on bordeaux mixture in the control of peach blight and leaf curl. Hilgardia 14(9):491-515. DOI:10.3733/hilg.v14n09p491
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