What is Prodiamine?
Prodiamine is a highly effective pre-emergent herbicide widely used to prevent the germination of various annual grassy and broadleaf weeds in turfgrass, landscapes, and ornamental plantings. Its active ingredient creates a barrier in the soil, inhibiting weed seed germination without harming established plants. It's a popular choice for homeowners and professionals alike due to its long-lasting residual control and broad spectrum of weed prevention.
Common weeds controlled by Prodiamine include:
- Crabgrass
- Poa Annua (Annual Bluegrass)
- Goosegrass
- Foxtail
- Barnyardgrass
- Chickweed
- Spurge
Why Use a Prodiamine Calculator?
Accurate application of pre-emergent herbicides like Prodiamine is crucial for several reasons:
- Effectiveness: Applying too little can lead to breakthrough weeds, negating the effort and cost.
- Safety: Over-application can potentially harm desirable turf or plants, especially if not applied according to label instructions.
- Cost-Efficiency: Optimizing the amount used ensures you're not wasting product by over-applying.
- Environmental Responsibility: Precise application minimizes chemical runoff and environmental impact.
Our Prodiamine calculator simplifies this process, allowing you to quickly determine the exact amount of product needed for your specific lawn size and chosen Prodiamine formulation.
Understanding Prodiamine Formulations
Prodiamine is available in different formulations, each with a specific concentration of the active ingredient (AI). It's vital to know which type you're using, as this directly impacts the amount of product required.
Granular Products (e.g., 0.38%, 0.65%)
These are dry granules that you spread over your lawn using a broadcast or drop spreader. The percentage indicates the weight of active ingredient per total weight of the product. For example, a 0.38% granular product contains 0.0038 lbs of active Prodiamine per 1 lb of product.
- Prodiamine 0.38% Granular: A common formulation, often combined with fertilizer.
- Prodiamine 0.65% Granular: A higher concentration granular product, requiring less physical product per application area.
Water Dispersible Granules (WDG 65)
Prodiamine 65 WDG is a highly concentrated dry granular product designed to be mixed with water and applied as a liquid spray. "65" signifies that it contains 65% active ingredient by weight (0.65 lbs of AI per 1 lb of product). WDG formulations are often preferred for their flexibility in application rates and precise coverage, especially for larger areas or when specific spray patterns are desired.
Key Factors for Calculation
To use the calculator effectively, you'll need three pieces of information:
Area Size
Knowing the exact size of the area you intend to treat is fundamental. You can input this in either square feet (sq ft) or acres. For most residential lawns, square feet will be the more common unit. For larger properties or fields, acres is usually more appropriate.
Desired Application Rate
This refers to the amount of active ingredient (AI) you want to apply per unit area. Prodiamine labels typically provide rates in "lbs AI per acre" or sometimes "lbs AI per 1000 sq ft." Always consult your specific product's label for recommended application rates, as these can vary based on:
- Your turfgrass type (e.g., Bermuda, Fescue, Zoysia).
- The specific weeds you are targeting.
- The desired length of residual control.
- Your geographic location and growing season.
Product Concentration
As discussed, the concentration of active ingredient in your Prodiamine product (e.g., 0.38%, 0.65%, or 65 WDG) is critical for converting the desired AI rate into the actual amount of product you need to apply.
How to Use the Calculator
- Enter Area Size: Input the total area of your lawn or landscape in the "Area Size" field. Select whether it's in "Square Feet (sq ft)" or "Acres."
- Select Prodiamine Product Type: Choose the specific Prodiamine formulation you are using from the dropdown menu (e.g., "Prodiamine 0.38% Granular," "Prodiamine 65 WDG").
- Enter Desired Application Rate: Input the recommended application rate from your product's label. Select the appropriate unit, typically "lbs Active Ingredient (AI) per Acre" or "lbs Active Ingredient (AI) per 1000 sq ft."
- Click "Calculate": The calculator will instantly display the precise amount of Prodiamine product you need in pounds (lbs), ounces (oz), or grams (g), depending on the formulation and quantity.
Best Practices for Application
Once you've calculated the correct amount, follow these best practices for effective and safe application:
- Timing is Key: Apply Prodiamine before weed seeds germinate. This is typically in early spring for summer annuals (like crabgrass) and late summer/early fall for winter annuals (like poa annua). Soil temperature is a better indicator than calendar date.
- Calibrate Your Spreader/Sprayer: Always calibrate your equipment to ensure even distribution of the product. Uneven application can lead to patchy weed control or turf damage.
- Apply Evenly: Walk at a consistent pace and use overlapping passes to ensure uniform coverage.
- Water In: Prodiamine needs to be watered into the soil to activate the chemical barrier. Apply about 0.5 inches of irrigation or wait for rainfall within a few days of application.
- Read the Label: Always, always read and follow the specific instructions and safety precautions on your Prodiamine product label. It contains crucial information regarding application rates, turf compatibility, re-entry intervals, and PPE (Personal Protective Equipment).
Common Prodiamine Application Rates
While product labels are the definitive source, here are some typical annual rates for Prodiamine AI per acre, which can be split into multiple applications:
- Cool-Season Grasses (e.g., Fescue, Kentucky Bluegrass, Ryegrass): 0.37 to 0.75 lbs AI per acre per year.
- Warm-Season Grasses (e.g., Bermuda, Zoysia, St. Augustine, Centipede): 0.75 to 1.5 lbs AI per acre per year.
Note: These are general guidelines. Always refer to your specific product label for precise recommendations based on your grass type, target weeds, and local conditions.
Important Considerations and Disclaimer
This calculator is designed to assist in determining product quantities based on user inputs. It is not a substitute for reading and understanding the full product label. Always:
- Consult the Product Label: The label is the law. Adhere to all instructions, warnings, and restrictions.
- Environmental Factors: Consider weather conditions, soil type, and proximity to water bodies.
- Local Regulations: Be aware of any local ordinances or restrictions regarding herbicide application.
- Safety First: Wear appropriate personal protective equipment (PPE) as recommended on the label.
By using this calculator and following best practices, you can achieve a weed-free lawn efficiently and responsibly.