Junction WSP Fungicide/Bactericide

Junction WSP Fungicide/Bactericide, manufactured by Sepro, is a broad-spectrum, systemic protectant and curative fungicide with powerful activity against both fungal and bacterial plant pathogens on greenhouse ornamentals and non-residential turf.

Because this fungicide is systemic, it moves within the plant after application, making it effective not only on contact but also inside plant tissues where many pathogens hide and spread. This dual-action product is invaluable in ornamental production, where both types of diseases can strike under similar environmental conditions.

When it comes to protecting plants from both fungal and bacterial diseases, Junction WSP Fungicide/Bactericide stands out as a smart, professional-grade solution that delivers reliability, flexibility, and confidence in every application. Whether you’re using Junction preventively during high-risk weather conditions or curatively at the first sign of leaf spots, blights, or mildews, it delivers consistent coverage and dependable results that protect plant health, appearance, and long-term performance.

Tools Needed

An airblast sprayer, chemigation system, aircraft equipment, or spray rig will be needed. 

How to Use

• Step 1: Determine how much Junction WSP Fungicide/Bactericide to use by measuring the square footage of the treatment area. Find the square footage by measuring the treatment area's length and width in feet, then multiply them together (length X width = square footage). For acreage, take the square footage and divide it by one acre (square footage / 43,560 sq. ft. = acres). For turf, apply 2 to 3.6 oz. of Junction WSP Fungicide/Bactericide per 1 gallon of water per 1,000 sq. ft. For outdoor or greenhouse use on ornamentals, use 1.5 to 3.6 pounds of product per 100 gallons of water per acre. One 2 oz watersoluble packet per 5 gallons of water is equivalent to 2.5 pounds of Junction WSP per 100 gallons. Refer to the product label for specific application rates and restrictions. 
• Step 2: Add Junction WSP water-soluble packets to a spray tank half-filled with clean water. Begin agitation and allow the packets to dissolve, and release their contents into the circulating water. Allow sufficient mixing time to ensure complete dispersion and mixing of Junction WSP. Finish filling the spray tank. Continue agitation throughout the spraying operation to ensure uniform application.
• Step 3: Spray the top and bottom of foliage leaves until wet, but not to the point of runoff. Repeat at 7 to 14-day intervals as needed; use shorter intervals when severe disease conditions exist for ornamentals. For turf, the minimum retreatment interval is 10 days. Do not make more than 3 applications per year for turf. 

Where to Use

Junction WSP Fungicide/Bactericide is for turfgrasses on sod farms, golf courses, industrial (office parks) and commercial (municipal) lawns and other similar non-residential areas which are not used as athletic fields.

This product is also for outdoor or greenhouse use on ornamentals.

It is not intended for use on fruit trees by homeowners. Do not apply Junction WSP to plants grown for food or feed purposes. Do not use on pachysandra.

Do not use on athletic fields. Do not use on grasses intended for grazing, such as range or pasture grasses.

When to Use

Apply before diseases are present. If the applications occur at least 24 hours prior to anticipated frost conditions, some protection against light frost may be provided. No reduction in frost damage should be expected in those geographic areas where weather conditions favor severe frost.

Safety Information

Junction WSP Fungicide/Bactericide is safe for people and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product. 

Keep people and pets out of the treated area until 48 hours have passed after application. 

Special Considerations

Do not apply Junction WSP in a spray solution having a pH of less than 6.5 as phytotoxicity may occur.

Junction WSP may be reactive on masonry and metal surfaces such as galvanized roofing. Avoid contact with metal surfaces. Do not spray on cars, houses, lawn furniture, etc.

Do not mix with products containing diazinon, fosetyl-al, or other aluminum-containing products, or thiophanate-methyl because of physical incompatibility.