Strobe Pro is a preventative and curative fungicide effective against turfgrass diseases. It is formulated with two combination spectrum Azoxystrobin and Propiconazole. Azoxystrobin interferes with the normal respiration of the fungus and Propiconazole is a known DMI’s to help prevent cell membrane from forming. Use for treatment against leaf spots, patch diseases, stem, foliar and root diseases, fairy rings, anthracnose, molds, mildews and rusts of turfgrass. Apply as a foliar spray or in tank with other turf products. Strobe Pro is compatible with common fungicides, herbicides, insecticides, liquid fertilizers and biological control products.
Strobe Pro has demonstrated some phytotoxic effects when mixed with products that are formulated as EC’s. These effects are enhanced if applications are made under cool, cloudy conditions and these conditions re- main for several days following application. In addition, adjuvants that contain some form of silicone have also contributed to phytotoxicity.
Bermudagrass can be sensitive to Strobe Pro.
INTEGRATED PEST (DISEASE) MANAGEMENT
Strobe Pro should be integrated into an overall disease and pest management strategy whenever the use of a fungicide is required. Cultural practices known to reduce disease development should be followed. The SPECIFIC USE DIRECTIONS section in this label identifies specific IPM recommendations. Consult your local turf authority for additional IPM strategies established for your area. Strobe Pro may be used in State Agricultural Extension advisory (disease forecasting) programs which recommend application timing based on environmental factors favorable for disease development.
Strobe Pro is a mixture of a Group 3 (propiconazole) and a Group 11 (azoxystrobin) fungicide. Strobe Pro has two modes of action: (1) DMI (Demethylation Inhibitor of sterol biosynthesis) [Group 3], and (2) inhibitor of the Qo (quinone outside) site within the electron transport system (Qoi) as well as disrupting membrane synthesis by blocking demethylation [Group 11]. Fungal pathogens can develop resistance to products with the same mode of action when used repeatedly. Strobe Pro is not cross-resistant with other classes of fungicides which have different modes of action. Because resistance development cannot be predicted, use of this product must conform to resistance management strategies established for turf in your area. Consult your local or State turf authorities for resistance management strategies that are complementary to those in this label.
Resistance management strategies may include rotating and/or tank-mixing with products having different modes of action or limiting the total number of applications per season. Avoid alternation with other Qols, including pyraclostrobin and trifloxystrobin or other DMI’s including triadimefon, fenarimol, and myclobutanil. Strobe Pro must not be alternated or tank mixed with fungicides to which resistance has already developed. Continual use of A Strobe Pro may allow less sensitive strains of pathogens to increase in the population and reduce the efficacy of Strobe Pro. Albaugh encourages responsible resistance management to ensure effective long-term control of the fungal diseases on this label.
Use of a multiple-site contact fungicide including Chlorothalonil as an alternation or tank-mix partner can help alleviate selection pressure on pathogens and delay the onset of resistance. However, DO NOT use products containing chlorothalonil on home lawns or turf sites associated with apartment buildings, daycare centers, playgrounds, playfields, recreational park athletic fields, athletic fields located on or next to schools (i.e., elementary, middle and high schools), campgrounds, churches and theme parks.
Since pathogens differ in their potential to develop resistance to fungicides, the SPECIFIC USE DIRECTIONS section in this label provides resistance management strategies specific for each disease.
SPRAYING/MIXING INSTRUCTIONS Restriction
Do not apply Strobe Pro to turf by air. Do not exceed 3 fl. oz./1,000 sq. ft. every 30 days on any variety of bermudagrass. In FL, Do not apply Strobe Pro to bermudagrass golf course greens when temperatures exceed 90 degrees F.
Strobe Pro may be applied with all types of spray equipment commonly used for making ground applications. Do not apply Strobe Pro through any type of ultra-low volume (ULV) spray system (less than 3 gals/A). Proper adjustments and calibration of spraying equipment to give good canopy penetration and coverage is essential for good disease control. The higher rates in the rate range and/or shorter spray intervals may be required under conditions of heavy infection pressure, highly susceptible varieties, or when disease conducive environmental conditions exist.
Apply Strobe Pro in sufficient water volume for adequate coverage.
To prepare spray solution, partially fill the spray tank with clean water and begin agitation. Add the specified amount of Strobe Pro to the tank, allowing time for good dispersion, then add an adjuvant, if specified. If tank mixes are required, product must be added to the spray tank in the following order: Strobe Pro, wettable granular or dry flowable formulations, wettable powders and flowable (aqueous suspensions) products. Finish filling the tank to the desired volume to obtain the proper spray concentration. Maintain agitation throughout the spraying operation.
SPECIFIC USE DIRECTIONS
Strobe Pro is specified for control of certain pathogens causing foliar, stem, and root diseases, including leaf and stem blights, leaf spots, patch diseases, mildews, anthracnose, fairy rings, molds, and rusts of turfgrass plants. Strobe Pro may be used to control certain diseases on turf in golf courses, lawns and landscape areas around residential, institutional, public, commercial and industrial buildings, parks, recreational areas and athletic fields.
Integrated Pest (Disease) Management (IPM): Sound turf management resulting in healthy, vigorous turf is the foundation of a good IPM program. Cultural practices such as proper choice of turf variety, nutrient management, proper cutting height, thatch management, and proper watering, drainage, and moisture stress management should be integrated with the use of fungicides to increase turf vigor and reduce the susceptibility to disease. Immunoassay detection kits and extension service diagnostic services can assist in the early and accurate identification of causal organisms and corresponding selection of the proper fungicide when required.
Strobe Pro should be applied prior to disease development. Mix Strobe Pro with the required amount of water and apply as a dilute spray application in 2-4 gals, of water per 1000 sq. ft. (87-174 gals./A).
Apply Strobe Pro at rates and timings as described in this label.
Repeat applications at specified intervals for as long as required. For spot treatments, use 1.5 fl. oz. Strobe Pro per 1 to 2 gal. of water.
Do not apply more than 8.1 gal. product/acre/year (23.75 fl. oz. product/1000 sq. ft./year) Do not apply more than 7.047 lbs. a.i. propiconazole/acre/year. Do not apply more than 4.21 lbs. a.i. azoxystrobin/acre/year. Do not apply more than 32 times a year at the 0.75 oz. rate/1000 sq. ft. Do not apply more than 16 times a year at the 1.5 oz. rate/1000 sq. ft. Do not apply more than 8 times a year at the 3.0 oz. rate/1000 sq. ft. Applications may be made by ground only.
For use with soil injection applications: Strobe Pro may be applied through a liquid fungicide injector for the control of ectotrophic root diseases such as summer patch and take-all patch. Use Strobe Proonly in liquid injection equipment specifically designated for pesticide use.
Apply Strobe Proat 1.5-3 fl. oz. per 1000 sq. ft. Spray carrier volume must fall within 30-150 gals, of water per 1000 sq. ft. Injection hole spacing of 1 inch by 1 inch is specified for optimum control. Injection depth must be no greater than 2 inches. One inch depth is specified for optimum results. Application must follow disease control strategies used for normal broadcast spray programs.
For use in the establishment of turfgrass from seed or in overseeding of dormant turfgrass: Strobe Promay be used for control of certain turfgrass diseases associated with turfgrass establishment from seed. Strobe Pro may also be used during overseeding of dormant turfgrass.
Strobe Pro may be safely applied before or after seeding or at seedling germination and emergence to ryegrass, bentgrass, bluegrass, and fescue turfgrass types. Optimum application timing is during seeding.
See Application Directions section.
Rate Ranges: Use the shorter specified application interval and/or use the higher specified rate when prolonged favorable disease conditions exist.