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Erwinia amylovora, the cause of fireblight, has not been detected in Australia. However, pressures to permit imports of pomefruit from overseas could result in the introduction of the causal pathogen. A study was therefore made to assess the vulnerability of pome fruits to the disease at Orange,...
Berkleasmium correae, found on the stellate hairs on the abaxial leaf surface of Correa lawrenciana and causing darkening of the colonized area, is described as a new species.
Isolates of Alternaria alternata resistant (EC50=290) and sensitive (EC50≦2) to iprodione were recovered from lesions on passionfruit fruit. Cross resistance to procymi-done and vinclozolin was demonstrated. The resistant strains remained stable after five transfers in the absence of the...
The dye Chlorazol Black E, incorporated in a leaf-clearing solution containing ethanol, chloroform, lactic acid, phenol and chloral hydrate, gave excellent differentiation of rust and powdery mildew infections in leaf tissue at room temperature.
Root and petiole rot of Spathiphyllum species caused by Cylindrocladium spathiphyili is reported for the first time in Queensland.
Metalaxyl, fosetyl-AI, calcium nitrate and phosphorous acid were tested in field trials against carrot cavity spot. Metalaxyl applied to soil at 1 kg/ha at the three to six trueleaf stage was the most consistently effective treatment, reducing the proportion of roots affected by at least 32%....
A Petri plate test is described which can be used to screen for pathogenicity of fungi from diseased seedlings, plant roots, seeds or soil. Seedlings grown axenically on water agar are inoculated with test fungi and infection observed directly. The test method is also valuable for fungal...
This study identified sources of fungal spores causing postharvest infection of pome fruit and established relationships between inoculum concentrations of Penicillium expansum and wet core rot of apple. Twenty-four of 35 picking bins contained pathogenic fungi on the wood surfaces, including...
The effects of preharvest and postharvest inoculation of apple fruits with core rot fungi and the relationships between fruit shape and sinus opening on wet core rot were studied. Preharvest inoculation with Mucor piriformis, Penicillium roquefortii and Alternaria sp. did not cause core rot, but...
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