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A new bacterial leaf spot, caused by Xanthomonas campestris pv. fici, is reported for the first time in Australia; it causes angular leaf spot and leaf drop on ornamental Ficus spp. in Darwin. Symptoms appear on leaves as brown angular interveinal lesions of various sizes. Leaf drop occurs on...
Lettuce mosaic potyvirus (LMV) antigen was readily detected with imnunogold labelling in thin sections of the cells of the cotyledons, radicle, hypocotyl and endosperm of lettuce seed. This is the first report of the detection of LMV in the endosperm of lettuce seed.
Triadimenol implanted directly into the rhizomes of 2–3 m tall banana plants, at 0.5–2.0 g/plant, arrested development of leaf spot and speckle diseases caused by Mycosphaerelfa musicola and M. musae, respectively, but only on leaves that had already unfurled at the time of treatment. The...
A root maceration method for quantitative assessment of invasion of roots of red clover (Trifolium pratense) by soil-borne fungi was evaluated using naturally infected glasshouse-grown and field-grown plants. Washed, surface-sterilised roots were macerated in a blender in sterile distilled water...
Leek yellow stripe virus in leek was identified by morphology of the virus particles, enzyme-linked immunosorbent assay, decoration with specific antiserum, and mechanical transmission to healthy leek seedlings. Although related potyviruses have been identified in other Allium species, this is...
A range of fungicides was assessed on late-sown green peas in south-east Queensland and north-west Tasmania for the control of powdery mildew caused by Oldium sp. Triadimefon (Bayleton 125 EC) at 500 mL/ha applied at early flowering gave excellent control under high disease pressure in both...
A single application of metalaxyl to commercial carrot beds at rates between 0.43–2.14 kg/ha from 4 to 14 weeks after sowing, consistently reduced incidence of cavity spot. A single spray of phosphonate on beds at rates from 8–16.5 kg/ha up to 10 weeks after sowing had no effect on incidence of...
At fortnightly intervals, the spread of bacterial spot in two commercial outdoor plantings of standard Sims carnations and multiflowered Spray carnations was mapped and related to temperature and rainfall. The pattern of initial infections differed between the two types of carnations. Disease in...
The pine pathogen Sphaeropsis sapinea occurs in Western Australia; its presence appears to have been overlooked for many years.
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