General Use Recommendations
The general use recommendations for phenylamide-based products have remained unchanged since 1997. The key (“umbrella”) guidelines for product use are as follows (they have to be adapted to local requirements and resistance levels):
- The phenylamides should be used on a preventive and not curative or eradicative basis.
- For foliar applications, the phenylamides should be used in a pre-packed mixture containing an unrelated effective partner and used in a sound management program. Where residual partners are used, it is recommended to use between three quarters and full recommended rates. The phenylamide dosage in the mixture depends on its intrinsic activity and is defined by the respective company.
- The phenylamides should not be used as soil treatments against foliar diseases. When solo formulations are made available for soil use, strategies must be implemented which prevent any possibilities for foliar applications. For seed treatment, mixtures rather than straight phenylamides should be used whenever possible.
- The number of phenylamide applications should be limited (two to four consecutive applications per crop and year). The application intervals should not exceed 14 days and may be shorter in cases of high disease pressure. If rates and application intervals are reduced, the total amount of the phenylamide fungicide used per season should not exceed that of the full rate, and the total exposure time should remain the same. The rate of the mixing partners should remain the same for both intervals.
- Phenylamide sprays are recommended early season or during the period of active vegetative growth of the crop. The farmer should switch to non-phenylamide products not later than the normal standard application interval of the non- phenylamide product.