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Home My WebLink AboutRPT 8 TREE REPLACEMENT 3-7-88TO: WILLIAM HUSTON, CITY MANAGER FROM: PUBLIC WORKS DEPARTMENT/ENGINEERING DIVISION SUBJECT: CITY HALL TREE REPLACEMENT . RECOMMENDATION' Pleasure of the City Council. BACKGROUND' Recently, the decorative tree (Cupresso-cyparis leylandii) at the City Hall complex developed fungus disease, cypress canker, which causes the trees' twigs and · branches to yellow, fade and eventually die. Th.is disease is defined in general in the attached paper published by the University of Californi'a'-s Division of Agriculture and Natural Resources. Prior to the complete demise of the leylandii tree at City Hall, it was uprooted and blown over during the recent wind storms experienced within the area. The tree has since been totally removed. DISCUSSION Staff has reviewed various species of trees as a replacement for the leylandii' tree which was lost in a recent windstorm. Staff recommends that the replacement not be a leylandii as previously utilized in the original planting and its first replacement about 7-8 years ago. As a replacement tree, it is suggested that a Redwood tree which is native to the general area be utilized. The Redwood tree does require special care when planting to ensure that the planting area be properly prepared and that proper drainage to planting area is provided. The attached photo represents a Sequoia Redwood tree contained within a 42" box and having a height of approximately 18+ feet. Following are approximate costs for the indicated specimen size trees: Speci men Esti mated Total Tree Cost Planting Cost Estimated Cost 42" Box $ 600.00 $1200.00 $1800.00 48" Box 900. O0 2000. O0 2900. O0 54" Box 1200.00 2800.00 4000.00 A 54" box size tree is about the maximum size that can be realistically placed in the desired location without damaging too much of the existing facilities. In the event there are other species of trees that may be desirable to the City Council, it can be assumed that the price ranges would be very similar to those shown above. CITY HALL TREE REPLACEMENT February 29, 1988 Page 2 The replacement of the City Hall tree is not a currently budgeted item. Any action implementing the tree replacement will require a supplemental 1987-88 budget appropriation to cover the cost of any tree replacement of specimen size. B6b Lede~ecker Director of Public Works/City Engineer BL:mv Attach. Cy p 'ess Can (er A ~erious I'un~us disease o1' cyp~c~s, cypress'canker, ix killing or disfiguring many slx:tics o1'{ 'u/.c.v.su.r in nearly ail pmls o1' (.'alil'ornia. The most conspicuous symptonls of tile disease are the yellowing, fading, and death o1' individual twigs, branches or tops of affected trees, in inland areas, the .diebaCk contim~es progressively unlil the eutire tree~ sucCtllllbS. Death may occur al any season of thc year, but happens most (fi'ten in warm months when water stress from tsau~piratiou loss is high. The rungus attacks the living bark and cambium, progressively killing tt~e tissue4 Resinous leskms originale mainly al I,~ancls Iwig junclions and cxlcml into the cambium. The also readily infects Ihrtmgh wounds in Ihe bark al anv location. Ullisnalely. lite at'lccled pal'l is ~irclled by Iht iul'cctim~. As lesions tm thc larger bt am'hes gr¢,w in size, Ihe killed bark sinks, I't, ming ehmgnlcd cankers, l lcavy resin flow from Iht cciges of Iht cankered mca charactcrislic o1' lite disease in Ihri/ly frees. Thc ;llilt~Ulll of resin I'low from diseased lissucs is mucls less tm old slow-growing I rets. Fig. 1. Monterey cypress affected by canker. llosl llanff, e Thc principal hosts are b, lontercy cypress, Cupressus IIItICrOcIII'pll, Italian cypress, C. sempervirett.s', and the imergcneric hybrid, Cupressocyparis leylandii. C. lusi- tattica, (7. benthamii, C. arizonica, C. macnabiatta, and Jt#tipertts virgittiatta also are moderately susceptible. The larvae of lhe cypress bark m~dh, i,a.V~cyrcvia CtIpFC3!S¢IIItl, I'rctlUes~lly invade Iht b()rclcrs t)t' CllllkCl'S, wlmre Ihey excrete la~gc quanlilics o1' a rcdtlish brown t'ras~ and slimulalc adtlititmal resin I Iow. 'ibc disease prescul in all pa~ls coastal shelf Ironting the Paoli'it Ocean. (iausal I,'ungus 'l'he I'ungus that causes Ibc cliscasc is Sciridittm cardimde ('= COCVllt'llllt cardinah,), il I,roduccs spoi'cs (ctmitlia} in black lmslular I'ruiling bodies (ascervuli) ~m the surface of lesions I't'o~u /out Io eighl weeks al'let death o1' Iht lissucs. I~r~duclion ot' conidia is c~fimm'cd by moisture and ceases in very dry weal her. 'Iht si,read i,i Slflashing ami wiml-drivc,~ walc~ survive on the host lt~ several tl]o~Hhs whorl there instill'icictlt moistu['c.l'or i[n~ncdialc gcr~ninali{m and inl'ection. Thc pcrlccl stage of Ihe I.elllO. sllhtlt,ritl sp. Sl~()res I,l'OdtlCCd ill thc sexual I'ruit- i~g slructu~cs {pcrilhccia) arc ai~l~o~'nc ami may carry lot many miles. (~onidia Imvc been recovered Ir{m~ adult cypress bark iilolhs, Sllggcslil~g Ihat insects oilier animals also serve as agents o1' clJssc~)lJ~alioil the fungus. Control In inland areas, where the disease can be particularly severe, the only solution is to avoid planting susceptible trees. In areas closer to the coast, thc disease can be combated by removal of diseased branches in the summer COul, lcd with spraying the wounds with a fungicide. Pro- tcctive fungicidal sprays commencing with the first fall rains may be helpful ill preventing infections. Pruned material should be burned or buried to prevent produc- lion of the perfect state of the fungus. It is also advisable lo disinfect pruning tools between major cuts--wounds a~'c important cutry points for thc I'ungus. ilcmmlyl and chlorothalo,fil are elTective fungicides. Fungicides con- lathing copper are not elTcctivc in prcvcming infections. The mere presence of cypress bark moth larvae at sites of infection on the tree does not warraut their control. These insects are secondary invaders, having been attracted 'to the tree by disease-injured tissue. It is the fungus that is the tree or branch killer, not the insect larvae. Cooperative Exter sion UNIVERSITY OF CALIFORNIA Division of Agricult'[ r anct Natural Resources 7102 Formerly 2997 Fruiting bodies (sporodochia) of Coryneum fu~gus e ': '~. :~ ',' / . _..~_. :...-~.-. Fig. 2. l'hotograph and ¢lrawittl.~ of typic'-ai canbrs, i~ the l~hotograpi~ the i~fection origina£ed at tke bra~ch junctions. TIte authors are Arth,r l-L McCaift. Pleltlt lbthologist. Cooperative Extension. Berkeley. and W. Douglas Ha,tiitott. Far,! AdvisOr. Alameda County. WAi~NING ON THE USE OF CHEMICALS Pesticides are poisonous. Alwoy~ read end carefully follow all precautions and safety recommendations given on the contalr~er label. Store. all chemicals in their original labeled containers in a locked cabinet or shed, away from load or leeds, and out of the reach of children, unauthorized persons, pets, and livestock. Conllne chemicals to the property being treated. Avoid drift onto nelghboring properties, especially gardens containing fruits and/or vegetables ready to be picked. Thinly spread all leftover spray material on the soil where it cannot contaminate crops or standing or underground water supplles. (Do not pour down sink or toilet.) Wrap empty containers in newspaper and put in the garbage can. Never burn pesticide containers. PHYTOTOXICITY: Certain chemicals may cause plant injury If used at the wrong stage of plant development or when temperatures are too high. Iniury may also result from excessive amounts or the wrong formulation or from mixing Incompatible materials. Inert ingredle~tts, such as wetters, spreaders, emulsifiers, dlluents, and solvents, can cause plant Injury. Since formulations a~'e ~hen cha~tged by manufacturers, it is possible that plant injury may occur, even though no iniury was noted in previous seasons. T t~' Ulliver sity of Calilornia in compliance with th~, Civ il Riql ii s Acl nl 196,1,1 ill~ tX of tho EdIJCalion Amendments of 1972, and the Rehabililalion Act of 1973 does not discliminale on the basis of r~ce, creed, religion, color, nalional eli,lin, sex, or i~d:ll o~ physical hal~d~cap in any el its progralljs or a~ivilies, or with respect Io any of its employment ~licies, p~ actices, or procedures ] he Universily of California do~s not d~c~i.,l~at~ on lh~ basis el age, ancestry, sexual orienlalion, medial status, citizenship, nor because individuals are disabled or Vietnam era veterans. Inquiries regard, iq this policy tony t~ d~ecl~ Io tho Allirmalive Action Olficer, Division of Agriculture and Natural Resources, 2120 University Ave., University el Calilomia, Berkeley, Calilomia 94720 (415) 644-4270. Issupd in furth~farlce of Cooperative Exlollsion wo~k, Acts el M:~y ~ :..I .I~,., :~[~, lf) 14, in cooperation with Ihe U.S, Department el Agriculture. Jerome B. Siobed, D,eclor of Cool)pulhvn Fxl,.l~sion, Ul~ivorsity OI Caliloma ?rr,-rr, r~-tl/i3.fi-Vl /I /~rl