Effects of Sunflower Oil on Tomato Powdery Mildew Caused by Oidium neolycopersici

W. H. Ko; S. Y. Wang; T. F. Hsien; P. J. Ann; T. F. Hsieh

doi:10.1046/j.1439-0434.2003.00698.x

Effects of Sunflower Oil on Tomato Powdery Mildew Caused by Oidium neolycopersici

Journal

Journal of Phytopathology

Journal Volume

151

Journal Issue

3

Pages

144-148

Date Issued

2003-03

Date

2003-03

Author(s)

W. H. Ko

S. Y. Wang

T. F. Hsien

P. J. Ann

DOI

10.1046/j.1439-0434.2003.00698.x

URI

https://scholars.tari.gov.tw/handle/123456789/3988

Abstract

When tomato leaves were sprayed with 0.1% emulsified canola oil, corn oil, grape seed oil, peanut oil, safflower oil, soya bean oil or sunflower oil, the severity of powdery mildew caused by Oidium neolycopersici was greatly reduced. Among these edible oils tested, sunflower oil was the most effective in the control of powdery mildew. When sprayed with 0.5% sunflower oil, powdery mildew on tomato leaves was reduced to a negligible level. Sunflower oil applied to halves of upper leaf surface did not induce resistance against the pathogen in the non-treated halves. When applied to halves of lower leaf surface, it also failed to reduce the severity of powdery mildew on the upper leaf surface right above the treated area indicating that control of the powdery mildew by sunflower oil did not result from activation of host defence mechanisms. Scanning electron microscopy showed that control of powdery mildew with sunflower oil resulted mainly from the inhibition of conidial germination and suppression of mycelial growth of the pathogen.

Subjects

Disease control

edible oil

Oidium neolycopersici

powdery mildew

sunflower oil

Type

journal article

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