Typically, the second application is made 14-21 days after the initial application.ĭr. The activity of Proxy/Primo will either be “extended” by cold weather or “activated” by warm weather. Part of the reason the application range is so generous is that in cold weather it takes longer to get active in the plant, and in warmer weather it gets active faster. Air temperatures drive the metabolism of Proxy. However, if you have green-up, mowed and already made an application, cool temperatures should extend control. There is no benefit from applying your Proxy/Primo to dormant turf. GDD total greater than 220 (base 32 F).Īnnual bluegrass seeding in a fairway.The decision of when to apply Proxy/Primo should consider the following factors: Applying Proxy/Primo to dormant turf will not be effective. Both products are foliar absorbed and need living, green plant tissue for uptake. However, Michigan State University Extension advises considering some factors. 15 and uses anything over 220 GDD (base temperature of 32 degrees Fahrenheit) as a guide to making the first application. This combination has proven to be a reliable way to suppress seedheads and enhance turf quality in the spring. Many golf course superintendents use two applications of Proxy/Primo for managing annual bluegrass seedheads on putting greens. The green wave of GDD reaching the application timing will be moving into southern Michigan in the week week (see figure). The slow start to the growing season has once again resulted in many questions regarding growing degree-days (GDD) and application timing for Proxy/Primo to control annual bluegrass seedheads.
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