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www.landscapeirrigation.com Landscape and Irrigation April 2017 23 Chemical controls Chemical control involves the use of control products to manage weed populations. To effectively control a weed population by chemical controls, you must know the type, the life cycle and the growth habits of the weeds that occur in your area. Essentially, there are three types of weeds: ■ Broadleaf weeds such as dandelions, chickweed, henbit, clover, and Virginia buttonweed. ■ Grassy weeds such as crabgrass, annual bluegrass, torpedograss, and dallisgrass. ■ Sedges include yellow nutsedge and purple nutsedge. After you have identifi ed the weeds you intend to target, you will need to choose the type of control product to apply. When applying control products always read and follow the product label. Using a pre-emergent control product is a cost-effective and proactive way to eliminate weeds before germination. Pre- emergent control products are applied prior to weed emergence and inhibit the germination of weed seeds. The two commonly used formulations of pre-emergent weed control products are liquid and granular. The formulation you choose should be based on advantages and limitations of each formulation (cost, effectiveness, and safety) as it relates to your target, weather conditions, and application methods. Whether using a liquid or a granular product, your application equipment must be properly calibrated. This ensures that the proper amount of product is applied over the target area as instructed on the product label. Before liquid applications, you should inspect your spray equipment. Inspect hoses and fi ttings to make sure there is no leakage, which could cause injury to the desired turfgrass. Screens and nozzles should be clean and clear of any debris. Whether using a liquid or a granular, it is critical to the effectiveness of the product to consider and implement the following application tactics: ■ The timing of application is critical and should be based on soil temperatures. Spring and summer weeds require a minimum soil temperature of 55 degrees for three consecutive days. Fall and winter weeds will germinate when soil temperatures drop below 68 degrees. ■ Split applications increase the length of control. ■ Whether you use a liquid or a granular control product, watering in immediately after application increases the effectiveness and residual of the product. If the product remains on the surface, the sunlight will break down the active ingredient of the product, which lowers performance of the product. ■ Do not apply to saturated soils. When the soil is saturated 800.867.2108 www. brillianceled.com Wattage Operating Range IP warranty (years) 120 12vac 63 3 Compatible with all Brilliance LED lamps 800.452.7017 sales@kifco.com • www.kifco.com Most Trusted Traveling Irrigation Systems Since 1964 Most Trusted Traveling Irrigation Systems A Kifco Water-Reel allows you to irrigate multiple locations with a single machine. ey operate unattended and shut down auto- matically. Perfect solution for irregular shaped land- scapes. No in-ground sprinkler heads to repair or winterize. 800.452.7017