Testing Sunflower Inbred Lines for Tolerance to Phoma Black Stem

• Main Author: Boško Dedić
• Format: Article
• Language: English
• Published: Institute of Pesticides and Environmental Protection 2012-01-01
• Series: Pesticidi i Fitomedicina
• Subjects: Sunflower; Phoma macdonaldii; Tolerance; Inbred lines
• Online Access: http://www.pesting.org.rs/download.php/documents/27-4/27-4%20299-303.pdf

Phoma black stem is caused by a widespread pathogen Phoma macdonaldii Boerema.The disease occurs regularly, causing damage by early defoliation and premature ripening.Complete resistance of sunflower to this disease has never been found, but there arereports of differences in response by different genotypes. Fifty-four new inbred lines weretested in our trials conducted at the Rimski Šančevi experimental field. Plants in one trialwere non-irrigated, and irrigated in another. Sunflower plants were artificially inoculatedwith mycelial plugs in the bud stage. The length of stem lesions was measured and comparedusing an analysis of variance. Disease intensity was generally more severe in the nonirrigatedfield. There were significant differences in tolerance to Phoma black stem amongthe tested lines in both trials. The percentage of tolerant genotypes was 1.8%.