Ground Cover Supplement : GC Supplement - Spray application technology
GROUND COVER SPRAY APPLICATION TECHNOLOGY 2 Minimising drift risk Cover photo: Coarse droplets can achieve sufficient coverage and reduce spray drift risk, providing boom spray set-up is correct. Ground Cover is brought to you by growers and the Australian Government through the publisher, the Grains Research and Development Corporation (GRDC). GRDC: 02 6166 4500, fax 02 6166 4599 Write to: The Editor -- Ground Cover, PO Box 5367, Kingston ACT 2604 Executive Editor: Ms Maureen Cribb, Publications Manager, GRDC, 02 6166 4500 Managing Editor: Brad Collis, Coretext, 03 9670 1168, fax 03 9670 1127, firstname.lastname@example.org Editor: Emma Leonard, 08 8834 1233 Design and production: Coretext, www.coretext.com.au Advertising sales: Max Hyde, Hyde Media Pty Ltd, 03 9870 4161, fax 03 9870 4163, email@example.com Advertising is subject to terms and conditions published on the rate card, available from Hyde Media, and on the website www.coretext.com.au Circulation: Ms Maureen Cribb, 02 6166 4500 Printing: Cadillac Printing, Adelaide ISSN 1039-6217 Registered by Australia Post Publication No. NAD 3994 Disclaimer: Any recommendations, suggestions or opinions contained in this publication do not necessarily represent the policy or views of the Grains Research and Development Corporation. No person should act on the basis of the contents of this publication without first obtaining specific, independent professional advice. The Corporation and contributors to this Ground Cover supplement may identify products by proprietary or trade names to help readers identify particular types of products. We do not endorse or recommend the products of any manufacturer referred to. Other products may perform as well as or better than those specifically referred to. The GRDC will not be liable for any loss, damage, cost or expense incurred or arising by reason of any person using or relying on the information in this publication. Copyright: © All material published in Ground Cover is copyright protected and may not be reproduced in any form without written permission from the GRDC. ARTICLES AND PHOTOGRAPHS BY EMMA LEONARD, UNLESS OTHERWISE STATED BY STUART KEARNS, MANAGER, VALIDATION AND INTEGRATION, GRDC Protecting crops from weeds, diseases and pests imposes significant costs on Australian grain growers. Growers depend on the use of pesticides to increase their productivity and the quality of what they produce which, together, contribute to their competitiveness in global grain markets. One of the most enduring challenges in pesticide application is balancing efficacy with the management of spray drift. The wide range of conditions in which crops are grown in Australia, and the correspondingly wide range of conditions under which pesticides are applied, obviously means that achieving this balance can be very location specific. Irrespective of these local conditions, the factors that influence how much spray can potentially drift are the same. These factors relate primarily to weather conditions, choice of chemical, droplet size and sprayer set-up, including nozzle selection and, importantly, boom height. The purpose of this Ground Cover supplement is to help the spray application industry to better understand the parameters of spray application and to highlight some examples of ways to reduce the risk of spray drift. In recent years, the GRDC has brought some of the world's leaders in spray application technology to Australia to share their knowledge with advisers and growers. The GRDC has also supported Australia's own expertise in spray application technology at the Centre for Pesticide Application and Safety (CPAS). This investment and others have focused on gaining a better understanding of the efficacy of weed control through using nozzles that produce coarse droplets, which are less prone to drift. The focus of much of the discussion and research -- and indeed this supplement -- relates to herbicide drift. Herbicide drift can result in the most obvious off-target damage, but drift from any spray application -- herbicide, fungicide or insecticide -- is a waste and has potentially damaging ramifications and must be avoided. The use of more diverse rotations in Australian farming systems coincide with the potential for more instances of damage to neighbouring crops. This consequence of drift is often the main impact experienced by growers and liability insurance companies. However, pesticide contamination of water courses, toxicity to birds, fish and beneficial insects or their food sources, and environmental health issues are all increasingly unacceptable outcomes that can result from inappropriate application. Drift can be managed successfully with the right knowledge of your equipment and the factors influencing drift. Every application must be balanced between managing drift and maintaining effective crop protection. This supplement details many of the factors that must be considered to ensure a safe and accurate spray application. As you will read in the following articles, GRDC projects are tackling different aspects of drift management and are working closely with growers in all cropping regions. Information packages, fact sheets, workshops and field days on balancing efficacy with drift management are being planned in most regions as the GRDC increases its delivery of knowledge and management methods to minimise drift, maximise efficacy and increase industry productivity. More information: Stuart Kearns, 02 6166 4500, firstname.lastname@example.org INTRODUCTION DELTA T Delta T (∆T) is the difference between the wet and dry bulb temperatures. It is used to measure the relationship between temperature and relative humidity. ∆T is one of the parameters that should be considered when assessing the risk of spray drift and pesticide performance. Ideally the ∆T should be between 2 and 8˚C. CAUTION: RESEARCH ON UNREGISTERED PESTICIDE USE Any research with unregistered pesticides or of unregistered products reported in this document does not constitute a recommendation for that particular use by the authors or the authors' organisations. All pesticide applications must accord with the currently registered label for that particular pesticide, crop, pest and region.
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