Patricia Broadbent

Learn More
Xanthomonas campestris pv. citri, the cause of citrus canker, has not been detected in the major citrus growing areas of Australia. Recent isolated findings of canker A on Thursday Island (1984–85) and near Darwin (1990) have raised concerns about the vulnerability of citrus in the main citrus growing areas to the introduction of canker. Weather records(More)
The risks of introducing exotic citrus diseases through the importation of citrus fruit, seed and budwood are discussed. The experience with citrus bacterial spot in Florida has demonstrated that species identification and even pathogenicity testing are no longer adequate; serological and biochemical typing are essential before substantial eradication(More)
Citrus Tristeza Virus (CTV) exists as a large number of distinct strains differing in biological properties and with different distributions in citrus producing countries. Strategies such as eradication or cross protection, aimed at controlling severe variants of the pathogen, require procedures to identify virus strains accurately and reliably. To fill the(More)
Citrus tatter leaf virus (CTLV) has the potential to cause major losses to the Australian citrus industry if an infected clone is propagated, because the predominant rootstocks are intolerant of CTLV infection. We have developed a robust and specific semi-nested reverse transcription—polymerase chain reaction (RT-PCR) assay which detects CTLV in a range of(More)
There is clear potential for the genetic manipulation of key enzymes involved in stress metabolism in transgenic plants. However, the data emerging so far from such experiments are equivocal. The detailed analysis of stress responses in progeny of primary transgenics, coupled with comparisons with control transgenic plants that do not contain the GR(More)
Citrus tatter leaf virus (CiTLV) was detected in trees of Meyer lemon and three Washington navel orange cultivars by graft transmission to indicator plants of Troyer and Rusk citranges, by mechanical transmission to Physalis floridana and Chenopodium quinoa, and by CiTLV antiserum decoration of flexuous virus particles with a mean length of 616 nm.
Citrus canker (caused by Xanthomonas campestris pv. citri Group A) was detected in a pummelo orchard at Lambell’s Lagoon near Darwin in 1991. All citrus trees in the orchard were eradicated. Surveys of horticultural holdings at Lambell’s Lagoon in 1992 failed to detect symptoms of citrus canker. Leaf washings from trees in each orchard failed to detect X.(More)