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Growers warned of new leaf rust pathotype in WA

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An eastern Australian wheat leaf rust pathotype has been identified in four diverse regions across Western Australia (WA), reminding growers that long-distance movement of rust inoculum is a serious threat to crop health and hygiene... Growers need to be vigilant in checking their crops for the disease and be aware that varieties which carry the Lr13 (such as Wyalkatchem, Corack and Emu Rock) and Lr17a (Fortune) gene may now be compromised and require additional management... "Wyalkatchem may shift from R-MR to MS and Emu Rock from R to MS-S following further testing at the ACRCP. Some varieties have other leaf rust genes that are expected to still be effective so have a lesser rating shift- King Rock, Fortune and Zippy are likely to shift from R/MR to MRMS. Cultivars Carnamah and Cobra may also be vulnerable to the new pathotype but further tests are needed to establish their responses more accurately...
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