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Catalogue: GRDC Factsheets
Of SurfACe TemPerATure SPrAy OPerATiOnS in cooling night conditions airborne pesticides can concentrate near the surface and unpredictable winds can move droplets away from the target... During surface temperature inversions, air near the ground lacks turbulence... SOurCe GrAeme TePPer under a surface temperature inversion: air movement is much less turbulent so the air does not mix in the same way as during the day; airborne droplets can remain concentrated in the inversion layer for long periods of time; the direction and distance pesticides movement is very hard to predict; the movement of airborne droplets will vary depending on the landscape; and droplets or their remnants can move in different ways (figure 3)...
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Catalogue: GRDC Factsheets
Of SurfACe TemPerATure SPrAy OPerATiOnS in cooling night conditions airborne pesticides can concentrate near the surface and unpredictable winds can move droplets away from the target... During surface temperature inversions, air near the ground lacks turbulence... SOurCe GrAeme TePPer under a surface temperature inversion: air movement is much less turbulent so the air does not mix in the same way as during the day; airborne droplets can remain concentrated in the inversion layer for long periods of time; the direction and distance pesticides movement is very hard to predict; the movement of airborne droplets will vary depending on the landscape; and droplets or their remnants can move in different ways (figure 3)...
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Catalogue: GRDC Updates (West)
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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Catalogue: GRDC Updates
Author : Bill Gordon, Bill Gordon Consulting Pty Ltd "Bigger Sprayers and Bigger Droplets".. Applicators and advisors need to be able to identify when application has contributed to reduced efficacy and be able to modify the application technique when required... I believe all advisors should provide a short report on spray results to follow-up all recommendations, which indicates if an application or control issue has been identified, and how that may be remedied and prevented in the future...
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Catalogue: GRDC Media
Higher travel speeds have created the majority of issues associated with poor application... "When using a coarse spray quality, the larger droplets tend to hold their trajectory and faster travel speeds to increase the horizontal movement of larger droplets," Mr Gordon says... "Many operators and advisers don't fully understand the risks associated with spraying during the presence of surface temperature inversions, which occur on most nights," he said...
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Catalogue: GRDC Media
Growers warned: Spray in haste, regret at leisure.. Over head nozzle spraying water.. Higher travel speeds have created the majority of issues associated with poor application...
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Catalogue: GRDC Research Summaries
The Services are to increase awareness by growers, advisers, machinery dealers and trainers (primary information providers) in the Northern and Southern grain growing regions of the factors that contribute to spray drift and the tools and techniques available to minimise the potential for spray drift to occur without significantly impacting on product efficacy by: 1) Developing and updating resources and training materials for spray drift management courses and to the GRDC to include the most current information available for spray..... Spray operators can obtain advice on minimising the risk of spray drift by consulting the Grains Research and Development Corporation (GRDC) Fact Sheet Practical tips to reduce spray drift... Resource can help growers plan for summer spraying..
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Catalogue: GRDC Media
Grain growers in the southern cropping region are being advised that they can take action to improve weed control in wheel tracks during summer fallow spraying... A Weed Control in Wheel Tracks Fact Sheet , produced by the Grains Research and Development Corporation (GRDC), details measures that can reduce poor control of weeds in the sprayer's wheel tracks and adjacent areas during summer fallow applications... Lack of weed control in these areas can be the result of poor spray deposition, excessive dust or a combination of the two...
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Catalogue: GRDC Media
Watch a video with FAR Australia's Nick Poole... Rust has taken a back seat as the primary disease for wheat in the high rainfall zone (HRZ) of south-eastern Australia with Septoria Tritici Blotch (STB) taking the reins as the biggest headache for growers over the last three seasons... "It has a much longer latent period (time between fungal spores infecting the crop and symptoms appearing), meaning you can't tell whether new tissue is infected since it takes longer for the disease to reveal itself in the crop," Mr Poole said. "..
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Catalogue: GRDC Factsheets
Key pointS Auto boom height can help to maintain correct nozzle height above the target, which improves the evenness of the spray deposit and reduces spray drift through excessive boom height... electronic auto boom height controllers require regular calibration and may not be suited to all boom designs... Hydraulic (using load sensors): These systems also utilise a wheel with suspension mounted to the boom the wheel is used in conjunction with a hydraulic load sensor and lift ram that can adjust the boom height...
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