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Show I - soots in the lawn? read ud. them nttnrk P Jfid rfs In Uns ,ursr of horn, i1 . When rf as W1' u.n. I" ttrU i immc-dinoly sus- i,h ,ds. Often, how-"lis how-"lis hf M,er ,,p,,ly lip "J onw I'rtscs, II lU'liially iaufS the problem to iiureae in severity. sever-ity. l'reiiieiulv, when we are reailv to give up ami replant the affivlcd area, the grasses seem to reeover. there are many things that ean cause lawns to turn brown, iiiiliuling lack of water. Other tailors that we sliouUl consider are insect damage fertilizer bum, ami tiiilgniss iliseases. While insects can readily be found in affected areas of the lawn, and fertilizer burn is normally obvious, turfgruss diseases are not easily recognized. recog-nized. Ilelnilnllioiporlum dlamiiv This fungus caused disease (also known us melting out, dyinn uit, fadim out. leaf I spot, crown or root rot) can attack any purf of (he plant. Kentucky bluegrass is the species thai is most severely ' affected by the disease. Normally, there are two distinct phases, leaf spot and crown rot. The leaf spot phase normally is worst during the cool, moist weather of spring and fall. Crown rot results when the fungus attacks the leaf sheath and then grows into the crown and roots. This phase can occur during the warm, dry summer weather of Utah. The leaf spot phase is the one most easily recognized since the oval shaped red-brown, red-brown, to purple-brown spots on the leaves are quite noticeable. notice-able. Although the leaf spots are more common in the spring or fall, they can be found throughout the growing season. Control A number of approaches can be used. First, growing a more resistant variety such as Merion bluegrass will reduce losses to the crown rot phase. Management practices can I also reduce severity of the disease. Avoid over fertilizing with nitrogen. Clipping the grass too short, or letting it get too long increases problems. The best height is Wt" to 2". Chemicals that have been found effective in controlling the diseuse are Captan, Daconil 2787, Zineb, and Ortho Lawn and Turf fungicide. fun-gicide. For more information you may contact the County Extension Office, 259-7598. |
