ORNAMENTALS - LEAF SPOT CONTROL

General Information

General Information

This package contains Cygnus fungicide, a 50% water-dispersible granule (WG). Cygnus is a foliar fungicide that has protective, and curative activity against powdery mildews, and protective activity against certain leaf spots, rusts, anthracnoses and downy mildews. For best results against powdery mildews, leaf spots, rusts, anthracnoses and downy mildews, a protective barrier of Cygnus must be established and maintained on the plant surface (refer to Table 1).

Mode of Action

Kresoxim-methyl, the active ingredient in Cygnus, belongs to the group of respiration inhibitors classified by the U.S. EPA and Canada PMRA as Quinone Outside Inhibitors (Qol), or Target Site of Action Group 11 Fungicides.

Crop Tolerance

The phytotoxic potential of Cygnus has been assessed on a wide variety of common ornamental plants. Refer to Table 2 for the list of plants shown to be tolerant to Cygnus. Refer to Table 3 for those plants not tolerant to Cygnus.

However, not all plant species and their varieties and cultivars have been tested for tolerance to Cygnus. In addition, all possible tank mix combinations, sequential pesticide treatments, and adjuvants or surfactants have not been evaluated. Local conditions can also influence crop tolerance and may not match those under which BASF has conducted testing. Therefore, before using Cygnus, test the product on a sample of the crop to be treated to ensure that a phytotoxic response will not occur.

Sensitive Crop Precaution

Cygnus may cause injury to Asian pear of variety "Olympic" and certain sensitive sweet cherry varieties such as Angela, Chelan, Somerset, Sweetheart, Valera, Van, Vandalay, Vista, Cavalier, Coral Champagne, Emperor Francis, Royalton, Schmidt, Summit, and Viva. Consult a BASF representative or local agricultural authorities for more information concerning additional cherry varieties that may be sensitive to Cygnus. Use special care when applying Cygnus to prevent contact with the sensitive plant species and varieties listed in Table 3. Avoid off-target movement.

Cleaning Spray Equipment

Spraying equipment must be cleaned thoroughly before and after applying this product, particularly if a product with the potential to injure crops was used prior to Cygnus.

Resistance Management

Cygnus contains Kresoxim-methyl, a Group 11 fungicide, and is effective against pathogens resistant to fungicides with modes of action different from those of Qol fungicides (Target site Group 11), such as, dicarboximides, sterol inhibitors, benzimidazoles, or phenylamides. Fungal isolates resistant to Group 11 fungicides such as, kresoximmethyl, azoxystrobin, trifloxystrobin, and pyraclostrobin, may eventually dominate the fungal population if Group 11 fungicides are used predominantly and repeatedly in the same field in successive years as the primary method of control for the targeted pathogen species. This may result in reduction of disease control by Cygnus fungicide or other Group 11 fungicides.

To limit the potential for development of resistance to Cygnus and other Group 11 fungicides:
- For outdoor use, DO NOT make more than six applications of Cygnus or other strobilurin fungicides per season.
- For use in greenhouses, DO NOT make more than eight applications of Cygnus or other strobilurin fungicides per year.
- For powdery mildew control, alternate each application of Cygnus with two sequential applications of labeled non-strobilurin fungicides with a different mode of action.
- For control of scab, leaf spots and rusts, DO NOT make more than two sequential applications of Cygnus. Then alternate to at least an equal number of sequential applications of labeled non-strobilurin fungicides with a different mode of action before applying Cygnus again.

The following recommendations may be considered to delay the development of fungicide resistance:
1. Tank mixtures: Use tank mixtures with fungicides from different target site of action groups that are registered/permitted for the same use and that are effective against the pathogens of concern. BASF recommends using at least the minimum labeled rates of each fungicide in the tank mix.
2. IPM: Cygnus should be integrated into an over all disease and pest management program. Cultural practices known to reduce disease development should be followed. Consult your local extension specialist, certified crop advisor and/or BASF representative for additional IPM strategies established for your area. Cygnus may be used in Agricultural Extension advisory (disease forecasting) programs, which recommend application timing based on environmental factors favorable for disease
development.
3. Monitoring: Monitor efficacy of all fungicides used in the disease management program against the targeted pathogen and record other factors that may influence fungicide performance and/or disease development. If a Group 11 target site fungicide, such as Cygnus, appears to be less effective against a pathogen that it previously controlled or suppressed, contact a BASF representative, local extension specialist, or certified crop advisor for further investigation.

APPLICATION INSTRUCTIONS

For the control of scab, apply 1.0–1.6 ounces of Cygnus per 100 gallons of water at 10-14 day intervals as a preventative treatment. Start applications at bud break or when environmental conditions are favorable for disease development. Use the higher rate of Cygnus when heavy infection pressure exists or is anticipated.

For the control of rose black spot and ornamental leaf spots, apply 1.6-3.2 ounces of Cygnus per 100 gallons of water at 7-14 day intervals as a preventative treatment.

For the control of powdery mildew, apply 1.6-3.2 ounces of Cygnus per 100 gallons of water as a preventative treatment or at the first signs of disease. Applications made at the first signs of powdery mildew will require higher rates and shorter spray intervals. The addition of up to 0.06% of a non-organosilicone spreader-sticker type adjuvant may improve powdery mildew control. DO NOT use organosilicone-based adjuvants with Cygnus.

For the control of rusts, anthracnose and downy mildew, apply Cygnus only as a preventative treatment at 3.2-6.4 oz per 100 gallons of water at 7-10 day intervals. The addition of up to 0.06% of a non-organosilicone spreadersticker type adjuvant may improve rust control. DO NOT use organosilicone-based adjuvants with Cygnus.

Spray to the point of drip for all applications, making sure not to exceed the maximum seasonal use rate. Refer to Table 1 for specific recommendations for disease control.

Coverage

Apply the appropriate amount of spray solution to cover the foliage to the point of drip. Thorough coverage of all plant surfaces is required for optimum disease control.

Additives

Additives or spray adjuvants are usually not necessary for use with Cygnus. The addition of up to 0.06% of a nonorganosilicone spreader-sticker type adjuvant may improve spray coverage and control of certain diseases.

DO NOT use organosilicon-based adjuvants with Cygnus, as crop phytotoxicity may result on certain ornamental species. Consult a BASF representative or local agricultural authorities for more information concerning additives.

General Restrictions and limitations - Greenhouse Use

- DO NOT make more than 8 applications of Cygnus per year.
- DO NOT apply to crops subjected to stress conditions such as excessive heat, as crop injury may result.
- DO NOT apply to crops that show injury (leaf phytotoxicity or plant stunting) produced by prior pesticide applications, because this injury may be enhanced or prolonged.
- DO NOT apply this product as a smoke, mist, fog or aerosol.
- DO NOT apply through any type of irrigation equipment.
- DO NOT use fruit from ornamental plants for food or feed purposes.
- Cygnus is not for sale, distribution, or use in Nassau and Suffolk Counties in New York State.

General Restrictions and Limitations - Outdoor Use

- DO NOT apply more than a total of 25.6 ounces (1.6 pounds) of Cygnus per acre per season.
- DO NOT apply to crops subjected to stress conditions such as drought or widely fluctuating temperatures or excessive heat, as crop injury may result.
- DO NOT apply to crops that show injury (leaf phytotoxicity or plant stunting) produced by prior pesticide applications, because this injury may be enhanced or prolonged.
- DO NOT apply through any type of irrigation equipment.
- DO NOT use fruit from ornamental plants for food or feed purposes.
- Cygnus is not for sale, distribution, or use in Nassau and Suffolk Counties in New York State.

Limitations, Restrictions, and Exceptions

Directions for Use

Apply as a protective spray and continue on a 7-14 day interval.

Method
Restricted Entry Interval

12 hours

Timings