Factors affecting antagonism of cucumber powdery mildew by Stephanoascus flocculosus and S. rugulosus

• Published in: Mycological research Vol. 92; no. 2; pp. 162 - 165
• Main Authors: Jarvis, W.R., Shaw, L.A., Traquair, J.A.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1989; Elsevier
• Subjects: Antagonism; Biological and medical sciences; Biological control; Control; Cucumis sativus; Fundamental and applied biological sciences. Psychology; Fungal plant pathogens; growth rate; Phytopathology. Animal pests. Plant and forest protection; plant interaction; powdery mildew; relative humidity; Sphaerotheca; Sphaerotheca fuliginea; Stephanoascus flocculosus; Stephanoascus rugulosus; temperature; yeasts; Stephanoascus flocculosus; Antagonism; Stephanoascus rugulosus; Biological control; Sphaerotheca fuliginea; Microorganism interrelationships; Temperature; Cucurbitaceae; Environmental factor; Phytopathogen; Cucumis sativus; Fungi; Vegetable crop; Ultrastructure; Dicotyledones; Angiospermae; Humidity; Ascomycetes; Spermatophyta; Antagonist; Thallophyta
• ISSN: 0953-7562; 1469-8102
• DOI: 10.1016/S0953-7562(89)80006-1

Stephanoascus flocculosus and S. rugulosus colonized and killed Sphaerotheca fuliginea on leaf disks of cucumber. Optimum temperature for antagonism was 26 °C and above 80 % r.h. the mycelium and conidia of S. fuliginea were killed in less than 48 h. No antagonism was observed at or below 60% r.h. Scanning electron microscopy revealed that the antagonists had caused complete collapse of the mycelium and conidia with no sign of hyphal invasion.