Results 171 to 180 of about 1,718 (211)

Controlling allium white rot (sclerotium cepivorum) without chemicals

Phytoparasitica, 1992
Integrated systems based on biological and cultural methods, hygiene and sanitation offer potential for the control of white rot. The need to avoid chemicals has prompted research on the dynamics of sclerotium production, depletion and germination.
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Detection of Sclerotium cepivorum within onion plants using PCR primers

Physiological and Molecular Plant Pathology, 2003
Abstract Primers were designed to amplify the 5·8S rRNA gene and part of the flanking ITS regions from S. cepivorum, the causal agent of white rot in onion (Allium cepa). The primers amplified a DNA fragment of the same size from seven UK isolates of S. cepivorum and not from related fungi or the host plant while an atypical Egyptian isolate produced
M.Anwar Haq, Hamish A Collin, A.Brian Tomsett, Meriel G Jones   +3 more
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Studies of dormancy in sclerotia of Sclerotium cepivorum

Plant Pathology, 1987
Sclerotia of Sclerotium cepivorum formed on onion bulbs in soil were shown to undergo a period of constitutive dormancy lasting 1–3 months during which they failed to respond maximally to the germination stimulant diallyl disulphide. Even after the breakdown of constitutive dormancy sclerotia
J. R. COLEY‐SMITH, D. PARFITT, I. M. TAYLOR, R. A. REESE   +3 more
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STUDIES OF THE BIOLOGY OF SCLEROTIUM CEPIVORUM BERK.

Annals of Applied Biology, 1956
Sclerotium cepivorum did not grow from agar into unsterile soil, but growth of restricted duration and extent was observed from infected onion tissue. Growth depended on the food reserves and its extent was determined by the size and age of the infected tissue.
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Control of Allium white rot (Sclerotium cepivorum) with composted onion waste

Soil Biology and Biochemistry, 2002
Abstract We investigated the possibility of composting onion waste to destroy any sclerotia present and then applying the composted waste to soil to stimulate sclerotial germination to disinfest the soil of the white rot fungus. Three mixtures of dry (shale-skins or onion tops) and wet (peelings or chopped whole bulbs) onion waste were incubated for ...
E Coventry, R Noble, A Mead, J.M Whipps
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Long‐term survival of sclerotia of Sclerotium cepivorum and Stromatinia gladioli

Plant Pathology, 1990
In an experiment with pure‐culture sclerotia of Sclerotium cepivorum and Stromatinia gladioli a large proportion of the sclerotia survived burial for 20 years in the field in the absence of host plants.
J. R. COLEY‐SMITH, CHRISTINE M. MITCHELL, CLAIRE E. SANSFORD   +2 more
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Germination and Infectious Potential of Microconidia of Sclerotium cepivorum

Journal of Phytopathology, 1997
AbstractObservation with the scanning electron microscope showed that microconidia of Sclerotium cepivorum are able to germinate on onion plants. A young hypha penetrated the plant cuticle. Cytochemical techniques gave evidence of phenoloxydase and esterase activities in microconidia and thus confirmed their infectious potential.
C. Gindro, G. L'Hoste
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Anatomy and histochemistry of resting and germinating sclerotia of Sclerotium cepivorum

Transactions of the British Mycological Society, 1987
Sclerotia of Sclerotium cepivorum had a rind one or two cells thick, no cortex, and a medulla in which all interhyphal spaces were filled with a polysaccharide gel. The main reserve materials were protein bodies in medullary hyphae. Sclerotia recovered from soil after several years burial showed extensive loss of hyphal contents although their rinds ...
D. Backhouse, A. Stewart
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STUDIES OF THE BIOLOGY OF SCLEROTIUM CEPIVORUM BERK.

Annals of Applied Biology, 1960
Sclerotia from 6‐week‐old pure cultures of Sclerotium cepivorum germinated immediately in soil only after abrasion of their rinds, but after burial in soil for a month or more, unabraded sclerotia became capable of germination.Marked stimulation of germination occurred in the presence of host plants (onion, leek and shallot).
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The effect of temperature on the infection of onions by Sclerotium cepivorum

Annals of Applied Biology, 1976
ABSTRACTStudies on Sclerotium cepivorum infection of salad onions in artificially infested soil showed that under field conditions infection was greatest in late spring and summer and declined to a low level in the late autumn and winter months. Change of infection levels was found to be correlated with the effect of soil temperature in the field on ...
A. R. Entwistle, H. L. Munasinghe
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