| Show T-1- -W ’T 60 Thursday Ufa May 20 1999 Standard-Exanrun- er Wet weather wreaking havoc We can expect more diseases in our trees because of extra moisture up in western I Growing a wet spring to Utah mo where I was told the weather was dry I hoped this meant I could look forward to fewer disease problems W’ell it appears the Washington weather found me after all this time Unfortunately because of the cool wet spring we can expect a few more diseases than normal this year Most diseases require some moisture to establish and grow on their host plants Some do not care about the moisture level and create problems every year regardless I oliage diseases that like a wet spring are the ones 1 am concerned about The most common wet spring problems affect two native trees we plant in our landscapes Quaking aspen and Gambel or scrub oak can have several problems These usually go undetected in nature because the trees are found in such large stands However when we bring just one or a few of these trees into our yard we notice very quickly w hen they become diseased and struggle Aspen leaf spot can be a problem on aspens poplars and some willows The symptoms include small dark brown flecks with light centers These spots gradually grow together throughout the season forming larger dead black and brown spots on the leaf The leaves are infected in the spring just as they emerge and grow The fungus spreads to the young leaves through w ind and ram - both common this spring In severe cases the leaves die and fall off the tree Although the tree usually survives this infestation the disease weakens the tree and makes it more susceptible to other problems Control is not easy Be certain to rake up and remove all fallen leaves especially in the fall Prune the trees to provide good air circulation and keep them as healthy as possible This usually means avoiding overwatenng (I’ll talk to Mother Nature and try to get her cooperation) keeping the lawn mower and weed eater away from the trunk watching for signs of iron deficiency and correcting any problems Apply a protective fungicide spray to the newly emerging folu ge Repeat the application every 10 to 14 days When buy mg a spray be certain the target tree is on the label Currently Dacoml and fixed copper sprays such as Microcop are being used to help control leaf spot Be certain to read and Joiltm all label directions carefully One major problem with oaks is a disease know-- as oakleaf blister It is aggravated by wet springs like this one The symptoms include raised or sunken lesions that look like blisters on the leaves which is how the disease got its name The blisters look light green when they first appear and eventually turn brown Occasionally they grow together distorting the leafs shape This disease is only spread in the cool wet spring so it is important to control the disease now Many of the same cultural practices used with aspens can be applied to oaks Clean up all fallen leaves keep the trees healthy and do not overwater The fungicide of choice is Dacoml Both of these diseases are usually not fatal to the trees and do not have to be treated Aspens survive with leaf spot for years but are not as aesthetically appealing This also holds true of oaks with oak leaf blister Other diseases will probably afTed different trees in the landscape Most likely we will see anthracnose in sycamores maples and oaks This disease also loves a wet and cool spring Its symptoms include necrosis (dead areas) that spread along the veins of the leaves especially the mid rib Infected leaves often drop off the tree making the tree look a little thm Control is usually not recommended because the disease normally is not fatal just unsightly If your plant is having some other weird symptom or disease please bring in a sample to our Plant Diagnostic Clinic It is held from 6 pm every Wednesday at the Education Building of the botanical gardens on 1750 Monroe Blvd m Ogden Jerry Goodspeed is a hortk ulturist h ith the Weber County 3-- branch of the Utah State University Extension Service He can be reached at his offices on the Ogden River Park ay 1 750 Monroe Blvd 0 Ogden or at 627-327- x v v A STRAWBERRIES Jii' t d) - tf ' i - ' f & t‘SsJ tA Vs V ji ’x s v t 5 Half Case 2 Lbs TJ Farms ! 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