Foliar fungicide applications at or prior to first node stage (Z31) can be effective at controlling leaf spot diseases in susceptible wheat varieties under high disease pressure... Necrotic leaf area was determined on top 3 to 4 leaves (on 15 tillers /plot) from all plots at Z15, Z25, Z31, Z39, Z55 (i.e. before each foliar fungicide spray) and Z72, or in the case of opportunistic trials assessed at regular intervals after trial establishment... The in-furrow fungicides tested show promise for leaf spot disease control and in the future they may become an alternative to foliar applications, for the control of early season leaf spot infections...
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Collective action can minimise barley disease losses.. "Strategies that can help minimise the risk of yield losses include destroying the 'green bridge' including barley volunteers and weeds (to reduce rust carry-over); using appropriate seeding strategies; monitoring emerging crops for signs of disease; and considering using a registered foliar fungicide if the variety is susceptible to the diseases found," Dr Jayasena said... "I encourage growers to monitor the early development of crops for leaf disease symptoms and to consider using a registered foliar fungicide if the variety is susceptible to the diseases found," Dr Jayasena said...
High levels of yellow spot or stagonospora (septoria) nodorum blotch before flag leaf emergence can reduce plant growth and ultimately the yield of susceptible wheat varieties... Our research aims were to determine if foliar fungicide application prior to stem extension can be valuable for controlling early infection and, more importantly, profitable by giving a yield benefit across a range of environments... Necrotic leaf area was determined on top 3 to 4 leaves (on 15 tillers /plot) from all plots at Z15, Z25, Z31, Z39, Z55 (i.e. before each foliar fungicide spray) and Z72, or in the case of opportunistic trials assessed at regular intervals after trial establishment...
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The disease Variety resistance - Susceptibility of current varieties - Benefits from improved resistance Fungicide efficacy - Fungicides at sowing - Foliar fungicides - Factors affecting fungicide efficacy.. Variety resistance Susceptible varieties drive current mildew epidemic Under high mildew pressure, use more resistant varieties: - Reduce infection severity - Reduce yield losses.. Mildew severity sprayed leaf (%LAA) Data courtesy: DAFWA, Nufarm, Curtin University..
Controlling leaf spot diseases - yellow spot and stagonospora (septoria) nodorum - in wheat-onwheat cropping 1... Early spraying can reduce le;af spot diseases when susceptible varieties are sow; n on wheat stubble.. Where early disease is severe and developing rapidly on susceptible variety & seasonal conditions favour disease development Application at tillering or stem extension delays disease development and increases yield Z31 application most reliable timing for profitability May need additional application at flag leaf emergence..