Evaluation of anilinopyrimidine and other fungicides for control of grey mould (Botrytis cinerea) in container-grown Calluna vulgaris.

Background: Grey mould (Botrytis cinerea Pers. ex Fr.) is a damaging disease affecting container-grown Calluna vulgaris (L.

Effects of water potential on mycelial growth, sclerotial production, and germination of Rhizoctonia solani from potato.

The effects of osmotic and matric potential on mycelial growth, sclerotial production and germination of isolates of Rhizoctonia solani [anastomosis groups (AGs) 2-1 and 3] from potato were studied on potato dextrose agar (PDA) adjusted osmotically with sodium chloride, potassium chloride, glycerol, and matrically with polyethylene glycol (PEG) 6000. All isolates from AGs 2-1 and AG-3 exhibited fastest mycelial growth on unamended PDA (-0.4MPa), and growth generally declined with decreasing osmotic and matric potentials.

Enzyme production by the mycoparasite Verticillium biguttatum against Rhizoctonia solani.

Verticillium biguttatum, a mycoparasite of the ubiquitous soil-borne plant pathogen Rhizoctonia solani, excreted chitinase and beta-1,3-glucanase into liquid medium when grown on laminarin and chitin, respectively. Neither chitinase nor beta-1,3-glucanase was produced by the mycoparasite when grown on cell walls of two isolates of R. solani representing anastomosis groups (AG)-3 and AG-8.

Biology and integrated control of Pestalotiopsis on container-grown ericaceous crops.

Pestalotiopsis isolates obtained from the foliage, stem-base and roots of diseased container-grown ericaceous crops (Calluna, Erica, Pieris and Rhododendron) collected from UK nurseries were identified as Pestalotiopsis sydowiana (Bresad) B Sutton on the basis of conidia morphology. Inoculum sources of the pathogen included diseased stock plants, crop debris, nursery soils, used growing media, pots and floor covering, and dust collected from greenhouse walkways. Isolates were not host-specific and infected other species of ericaceous plants, with typical symptoms including browning of foliage, stems and roots, and the presence of black or greenish black acervuli on diseased tissue.

Production of macrosphelide A by the mycoparasite Coniothyrium minitans.

Coniothyrium minitans, a mycoparasite of sclerotia of Sclerotinia sclerotiorum and Sclerotium cepivorum, produced four closely related metabolites inhibitory to fungal growth. The major metabolite, identified as macrosphelide A, had IG(50) values (the concentration of metabolite to inhibit growth by 50%) of 46.6 and 2.