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Superior Express
Superior, Nebraska
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September 23, 2010     Superior Express
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September 23, 2010
 

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Page 6 The Leader The Week of September 20, 2010 As disease name, 'thousand Oak leaf spot unusually severe this year cankers' is apt and awful Oak trees in mid-America are BecauseTubakiaisafungaldis- food reserves it needs to survive having unusually severe problems ease, however, this year' s rains nest winter," he said. Thousand (1,000) cankers may "'Because they work out of sight this year with late-season leaf spot. probably supportedtheintensity and Oaks in general are most likely seem like a strange name for a dis- behind the tree' s bark. this pair can spread of its attack, Upham said. to get Tubakia leaf spot. But, the ease that kills black walnut trees be causing damage for years before Some victims have already losttheir Illinois got its usual spring infec- disease also can attack such trees as and is the object of a new Kansas any outward symptoms appear. By foliage. "'The disease cycle of Tubakia tion, but then the problem wors- the maple, hickory, chesmut, red- quarantine .... the time the tree starts to lose leaf spot needs more study. We're ened and Spread perhaps be---bud, ash, tupelo, sourwoodsassa- For those who know what itbranches or its canopy thins, the not sure, for example, why this cause the state received repeated fras and elm, the horticulturist said. mean's~, however, the nadie is both walnut is basically a goner. It could year's outbreak is worse than last heavy rains through summer. The "In Kansas, members of the red awful and accurate, said Nicole easily be averaging far more year's. Wedon'tknow whylllinois Kansas infection has been unusu- oak group are more likely to be Rice(, forest health specialist with than 1,000 beetles per linear inch of tends to have problems in spring ally bad, yet its outbreak arrived affected than those in the white oak the Kansas Forest Service. branch," Rice( said. while Kansas' come in late sum- fight on time late in the growin~ group. But~'both groups are show- " iColorad~ State University sci-~ (~ mer. We don't even know why the season. .',' ~. ingsymptomsnow,'Uphamaddedv-enti~s discovered the disease and disease fungus selects some trees At this time of year;an other= "~- Re2] oaks tend to have iea~s _named ]ffin 2008. In his early at- Hallow en's and not others," said Ward Upham, wise healthy oak can lose all of its ,~with ~ristly'points anctdeeply ridgeM~ tempts to tell other experts how the Kansas State University Research leaves and still be fine: It's, had ..~ark~at'sdark.hesaic[:W.l~teoak~s disease works. CSU plant patholo- " a plenty oftime to make and store the haveleaveswithroundedl besand:'-gistNedTisseratcomparedittothe coming: Got nd Extension horticulturist. . scaly bark that's gray-brown, old Imperial Chinese style of pain- T)b "We don't recommend trying to fully slow execution-- "death by a pumr. .ln? :~~ control this disease with fungicide thousand cuts.'" The disease's offi- Ik K ~ ~ ., 'sprays. YoU'd have to start at bud cial name continues the compari- (SPM Wire) It's almost time to " ,~ ........ 1~/I /"~1~ ~:~7 ~" .~.break ~nd then spray~repeate~lly," s qn. Rice( said. carve that pumpkin to create a ~: ~ "-- IV %J IL~,, y " ~'.~ - ~Upham sa~d. "'Besittes:nex~ ye'~r's LI~ ~'It's apt because a pair of pests spooky jack-o'-lantern. ~%~[.: . .:, ;. infeftion.~rate won't~badiust.~be-.