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Vawdrey L.L.,Center for Wet Tropics Agriculture | Male M.,PO Box 482 | Grice K.R.E.,Center for Tropical Agriculture
Crop Protection | Year: 2015

Results from the first of two artificially inoculated field experiments showed foliar applications of copper hydroxide (Blue Shield Copper) at 600g a.i./100L-1 (0% infected fruit), copper hydroxide+metalaxyl-M (Ridomil Gold Plus.) at 877.5g a.i./100L-1 (0.27%), metiram+pyraclostrobin (Aero) at 720g a.i./100L-1 (0.51%), chlorothalonil (Bravo WeatherStik) at 994g a.i./100L-1 (0.63%) and cuprous oxide (Nordox 750 WG) at 990g a.i./100L-1 (0.8%) of water significantly reduced the percentage of infected fruit compared to potassium phosphonate (Agri-Fos 600) at 1200g a.i./100L-1 (8.22%), dimethomorph (Acrobat) at 108g a.i./100L-1 (11.18%) and the untreated control (16%). Results from the second experiment showed fruit sprayed with copper hydroxide (Champ Dry Prill) at 300 (2.0% infected fruit), 375 (0.4%) and 450g a.i./100L-1 (0.6%) and metiram+pyraclostrobin (Aero) at 360 (2.8%), 480 (0.6%) and 600g a.i./100L-1 of water (1.0%) significantly reduced the percentage of infected fruit compared to the untreated control (19.4%). Foliar sprays of copper hydroxide at 375g a.i./100L-1 in rotation with chlorothalonil at 994g a.i./100L-1 every two weeks is now recommended to growers for controlling Phytophthora fruit rot of papaya. © 2014. Source

Male M.F.,Center for Wet Tropics Agriculture | Tan Y.P.,Plant Pathology Herbarium | Vawdrey L.L.,Center for Wet Tropics Agriculture | Shivas R.G.,Plant Pathology Herbarium
Australasian Plant Disease Notes | Year: 2011

In September 2010, banana blast symptoms were observed on leaves of tissue cultured banana plantlets cv. Dwarf Cavendish. The pathogen was identified as Pyricularia angulata, based on disease symptoms, fungal morphology, pathogenicity and ITS sequencing. Previous Pyricularia spp. samples and records were confirmed as being P. angulata. This report elucidates the identity and pathological status of P. angulata in Australia. © 2011 Australasian Plant Pathology Society Inc. Source

Male M.F.,Center for Wet Tropics Agriculture | Vawdrey L.L.,Center for Wet Tropics Agriculture
Australasian Plant Disease Notes | Year: 2010

Various chemical and non-chemical treatments were tested for their efficacy against damping-off in papaya seedlings caused by Pythium aphanidermatum. Three-week-old papaya seedlings were placed in a climate controlled experimental chamber and inoculated with macerated mycelium of P. aphanidermatum. Propamocarb as Previcur was found to be most effective at managing damping-off in papaya seedlings. © Australasian Plant thology ociety 2010. Source

Vawdrey L.L.,Center for Wet Tropics Agriculture | Langdon P.,Bayer CropSciences | Westerhuis D.,Center for Wet Tropics Agriculture
Australasian Plant Pathology | Year: 2010

The symptoms of fruit speckle of banana are minute reddish-brown to black spots (0.51 mm in diameter) often with an oil-soaked or water-soaked margin. Research was conducted into the aetiology, aspects of epidemiology and chemical control of fruit speckle. In a field planting of Lady-finger banana, bunches injected at bunch emergence with the fungicide azoxystrobin (0.15 g a.i./L) and sprayed fortnightly with azoxystrobin (0.25 g a.i./L) significantly reduced the number of speckle lesions/cm2 compared with bunches injected and sprayed fortnightly with insecticides indicating fruit speckle was caused by fungi. Of the 11 species of fungi recovered from speckle lesions, only Colletotrichum musae, Fusarium oxysporum and F. semitectum reproduced speckle-like symptoms on young fruit. Studies on fruit speckle epidemiology showed spraying young fruit with a 10% sap solution before inoculation with Fusarium spp. caused a 3-fold increase in the number of speckle lesions but had much less of an effect on the incidence of speckle following inoculation with C. musae. Fruit was also shown to be less susceptible to fruit speckle as it matured. The presence of flower thrips had little effect on the incidence of speckle on fruit inoculated with C. musae but caused a 10-fold increase in the incidence of speckle on fruit inoculated with Fusarium spp. In an in vitro experiment, the fungicides propineb, azoxystrobin, trifloxystrobin, copper oxide, mancozeb and chlorothalonil effectively reduced the disease compared with the inoculated control. © 2010 Australasian Plant Pathology Society. Source

Pattison A.B.,Center for Wet Tropics Agriculture | Badcock K.,Center for Wet Tropics Agriculture | Sikora R.A.,University of Bonn
Australasian Plant Pathology | Year: 2011

Radopholus similis is a major constraint to banana production in Australia and growers have relied on nematicides to manage production losses. The use of organic amendments is one method that may reduce the need for nematicides, but there is limited knowledge of the influence of organic amendments on endo-migratory nematodes, such as R. similis. Nine different amendments, namely, mill mud, mill ash, biosolids, municipal waste compost, banana residue, grass hay, legume hay, molasses and calcium silicate were applied to the three major soil types of the wet tropics region used for banana production. The nutrient content of the amendments was also determined. Banana plants were inoculated with R. similis and grown in the soil-amendment mix for 12-weeks in a glasshouse experiment. Assessments of plant growth, plant-parasitic nematodes and soil nematode community characteristics were made at the termination of the experiment. Significant suppression of plant-parasitic nematodes occurred in soils amended with legume hay, grass hay, banana residue and mill mud relative to untreated soil. These amendments were found to have the highest N and C content. The application of banana residue and mill mud significantly increased shoot dry weight at the termination of the experiment relative to untreated soil. Furthermore, the applications of banana residue, grass hay, mill mud and municipal waste compost increased the potential for suppression of plant-parasitic nematodes through antagonistic activity. The application of amendments that are high in C and N appeared to be able to induce suppression of plantparasitic nematodes in bananas, by developing a more favourable environment for antagonistic organisms. © Australasian Plant Pathology Society Inc. 2011. Source

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