CITRUS - IN-LINE DIP/DRENCH
Graduate A+ is a broad-spectrum, protective fungicide used to aid in the control of several storage diseases in postharvest facilities on Citrus Fruit, Crop Group 10-10.
Integrated Pest Management (IPM)
Graduate A+ must be integrated into an overall disease and pest management strategy (IPM) whenever the use of a fungicide is required. Cultural practices known to reduce disease development must be followed. Consult your local agricultural authorities for additional IPM strategies established for your area. Graduate A+ may be used in State Agricultural Extension advisory (disease forecasting) programs, which recommend application timing based on environmental factors favorable for disease development.
Graduate A+ is a protective fungicide used to aid in the control of post-harvest diseases. Graduate A+ contains fludioxonil and azoxystrobin. Fludioxonil is in the phenyl pyrrole group of fungicides, and has a mode of action involving interaction with a MAP/Histidine kinase that leads to disruption of osmotic signal transduction (Group 12 Fungicide). Azoxystrobin is in the strobilurin class of chemistry and its mode of action is inhibition of the Qo (quinone outside) site in the mitochondrial electron transport system (Group 11 Fungicide). Fungal isolates with acquired resistance to Group 11 or 12 may eventually dominate the fungal population if Group 11 or 12 fungicides are used repeatedly or in successive years as the primary method of control for targeted species. This may result in partial or total loss of control of those species by azoxystrobin or fludioxonil or other Group 11 or 12 fungicides. A disease management program that includes alternation or tank mixes between Graduate A+ and other labeled fungicides that have a different mode of action may prevent pathogen populations from developing resistance. Sanitation and other cultural practices to minimize disease are also advised to aid in control as well as to assist in preventing/delaying resistance development.
To delay fungicide resistance, take one or more of the following steps:
- Rotate the use of azoxystrobin or other Group 11 fungicides and fludioxonil or other Group 12 fungicides within a growing season sequence with different groups that control the same pathogens.
- Use tank mixtures with fungicide from a different group that are equally effective on the target pest when such use is permitted. Use at least the minimum application rate as labeled by the manufacturer.
- Adopt an integrated disease management program for fungicide use that includes scouting, uses historical information related to pesticide use, and crop rotation, and which considers host plant resistance, impact of environmental conditions on disease development, disease thresholds, as well as cultural, biological and other chemical control practices.
- Where possible, make use of predictive disease models to effectively time fungicide applications. Note that using predictive models alone is not sufficient to manage resistance.
- Monitor treated fungal populations for resistance development.
- Contact your local extension specialist or certified crop advisor for any additional pesticide resistance-management and/or IPM recommendations for specific crop and pathogens.
- For further information or to report suspected resistance contact Syngenta at 1-866-Syngent(a) (866-796-4368). You can also contact your pesticide distributor or university extension specialist to report resistance.
Methods of Application
Graduate A+ may be used as a post-harvest dip, drench, flood or spray application for control of certain post-harvest rots
on specified uses.
- All application equipment must be properly maintained and calibrated using appropriate carriers or surrogates.
- Use T-jet, CDA, flood jet, or similar application system for in-line aqueous or coating spray application.
Application Volume and Spray Coverage
- Ensure proper coverage from the dip/drench or spray application.
Citrus Fruit, Crop Group 10-10
- Mix in an appropriate amount of water, wax/oil emulsion, or aqueous dilution of wax/oil emulsion.
- Dip for a minimum of 30 seconds and allow fruit to drain.
- Refer to Resistance Management.
- Ensure the Graduate A+ solution remains in suspension by using agitation, otherwise product may settle out.
1) Maximum Rate per Application: 64 fl oz
2) Maximum Rate per Crop: 128 fl oz
a. DO NOT exceed 1.99 lb ai/crop of fl udioxonil-containing products.
b. DO NOT exceed 1.99 lb ai/crop of azoxystrobin-containing products.
3) DO NOT make more than two applications to citrus fruit. For maximum decay control, treat fruit once before storage and once after storage, just prior to marketing.