Landscape Management, June 2010
WEEDWATCH Recommended Dow AgroSciences solution Lontrel specialty herbicide CANADA THISTLE Cirsium arvense IDENTIFICATION TIPS This creeping perennials extensive rhizome system can extend up to 3 ft It features smooth oblong irregularly lobed leaves with spiny margins Pink or purple fl owers through September growing clusters Unlike musk and bull thistles the stems and fl owers do not have spines or prickles It colonizes in tall clusters 1 to 3 ft in height particularly in open areas CONTROL TIPS After the fi rst fl ower buds are formed and before the fi rst fl owers open apply foliar herbicides which move down through the plant and injure the root system Repeat applications on regrowth may be needed Removing shoots can stimulate growth on underground buds which can generate new shoots a year or more after top growth has been destroyed Hand pulling or mowing just spreads the growth of this problematic plant BROUGHT TO YOU BY bloom in late June in 3 4 in diameter LANDSCAPEMANAGEMENT NET JUNE 2010 34 PHOTOS COURTESY SHAWN ASKEW STANDING SENTINEL TO PROTECT PLANT HEALTH SPURGE Euphorbia maculata Recommended Dow AgroSciences solution Snapshot specialty herbicide IDENTIFICATION TIPS Red or purple tinged stems host opposite leaves and emit milky juice when broken Oblong leaves are smooth or sparsely hairy from reddish green to dark green in color often with a maroon or purple spot in the center The prostrate structure forms mats by branching from the base This warm season annual is found in disturbed soil such as in gardens and fl ower beds along sidewalks and in open turf areas CONTROL TIPS Apply a broadleaf preemergence herbicide in late spring If you have germinated spurge apply a post emergent herbicide when the plants are small Mulching of beds adequate soil moisture and good fertility help control this species Hand pulling plants when theyre small will minimize the seed deposits For more information regarding these and other turf weeds and related control technologies and tips please visit www DowProvesIt com or call 800 255 3726
You must have JavaScript enabled to view digital editions.
