Kithsiri Jayasena

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To study the loss of grain yield associated with specific levels of spot-type net blotch of barley, experiments were conducted at three sites with between four and six different levels of application of the fungicide propiconazole or mixtures of propiconazole and iprodione applied to obtain a wide range of disease levels. Yield loss varied from 23 to 44%.(More)
N20-RNA 3L, a large form of RNA 3 associated with Alfalfa mosaic virus (AMV) strain N20 comprises 2281nt and has approximately 97% overall sequence similarity to the longest previously described RNA 3 of AMV strain YSMV (YSMV-RNA 3; 2188nt). Compared with YSMV-RNA 3, N20-RNA 3L contains an additional 97nt in the 5' leader upstream of the open reading frames(More)
An isolated occurrence of Fusarium head blight (FHB) of wheat was detected in the south-west region of Western Australia during the 2003 harvest season. The molecular identity of 23 isolates of Fusarium spp. collected from this region during the FHB outbreak confirmed the associated pathogens to be F. graminearum, F. acuminatum or F. tricinctum. Moreover,(More)
Pseudothecia carrying asci with mature ascospores of Drechslera teres f. maculata were isolated from barley stubble from the southern part of Western Australia. Inoculation experiments were able to produce typical spot-type net blotch symptoms on the barley cultivar Gairdner. This is the first confirmed report of this teleomorph in Australia.
Fungicidal control of Blumeria graminis f. sp. hordei occurring in barley late in the growing season was examined in field experiments over 2 years. A single application of triazole fungicides at late booting (GS49) reduced powdery mildew severity and increased yield by 5–13%, depending on the season. Grain protein was slightly increased with fungicide(More)
The fertility regulatory effect of the fruit of Jatropha curcas was investigated by oral administration of different extracts to pregnant rats for varying periods of time. Foetal resorption was observed with methanol, petroleum ether and dichloromethane extracts indicating the abortifacient properties of the fruit. The results also suggest that the(More)
1. The preparation of a hormone-binding protein fraction (neurophysin) from porcine neurohypophyses is described.2. It was shown by gel-filtration that the protein (which sedimented as a single component on analytical ultracentrifugation) forms complexes with oxytocin and lysine vasopressin. The maximum capacity of porcine neurophysin to bind oxytocin and(More)
Barley powdery mildew caused by the fungus Blumeria graminis f. sp. hordei (Bgh) has emerged as the most damaging disease of barley in Western Australia (WA). Many of the available cultivars display high levels of disease in the field when climatic conditions are conducive. As a result, fungicides have become the main method of disease control in the last(More)
1. Protein fractions were prepared from serum and various organs of pigs following the methods used to extract and purify neurophysin from posterior pituitaries.2. Protein fractions extracted from porcine kidney, uterus, mammary gland or serum, which contain antigen reacting with anti-neurophysin serum, form non-dialysable complexes with oxytocin and/or(More)