O. Villalta, W. S. Washington, G. M. Rimmington, P. A. Taylor
The influence of spore dose and interrupted wet periods on pear scab infection was studied under controlled conditions by assessing disease development on pear seedlings. Under optimal conditions (20°C and continuous wetness), the severity of leaf scab (lesions/cm2) increased with conidial concentrations ranging from 102 to 105 conidia/mL. Pear seedlings inoculated with conidia were also exposed t...... hiện toàn bộ
During a survey of plant parasitic nematodes associated with native vegetation in Australia, two new species of Paratrichodorus were found. Paratrichodorus orrae n.sp. was collected from Eucalyptus woodland and P. queenslandensis n.sp, from tropical rainforest, both closely resembling P. grandis. Paratrichodorus lobatus and the closely related P. teres are studied and the six trichodorid species r...... hiện toàn bộ
L. Pappalardo, M. K. Smith, S. D. Hamill, A. M. Stirling, D. McKay
Genetic variation among 29 isolates of Fusarium oxysporum f.sp. zingiberi (Foz) collected from diseased ginger rhizome in production regions throughout Queensland was analysed using DNA amplification fingerprinting (DAF). Eight isolates of other Fusarium species and/or formae speciales were included for comparative analysis. Within the Foz isolates, three haplotypes were identified based on 17 pol...... hiện toàn bộ
E. Carstens, J. M. van Niekerk, W. A. Smit, P. H. Fourie
Fruit pathogens are currently one of the main factors involved in quarantine-related market access. Unconfirmed South African records pertaining to the presence of the causative agent of European canker of apples, Neonectria ditissima, have been the cause of many disputes regarding its status as a quarantine pest in this country. To clarify this issue, the identity of fungal isolates that were pre...... hiện toàn bộ
The field symptoms of Eradu patch are distinct, stunted patches in narrow-leaf lupin and ill-thrift patches in barley. The pathogen, a thin, binucleate Rhizoctonia (TBR), is difficult to isolate with standard methods. To develop an assay specific to TBR, the ribosomal RNA ITS region was amplified and a 610 bp section including the conserved 5.8S region was sequenced. This sequence did not match an...... hiện toàn bộ
Seed dressing with Baytan (a.i. triadimenol) completely controlled powdery mildew for more than 60 days and reduced disease levels for the rest of the season, increasing barley yield by 11% at Esperance. In 16 field experiments in southern Western Australia representing 32 agro-climatic environments, Baytan increased yield by an average 7%; greater percentage yield increases occurred in high yield...... hiện toàn bộ