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\ Garden states stretching from Nebraska and Kansas east to Pennsylvania and south to North Carolina. Although apparently present in the upper Mississippi Valley for many years, the disease did ttot cause concern, and, indeed, the fungus was not even described until 1943. Because of the rapidity with which infected trees die, oak wilt is, today, recognized as a major threat to all native species of Quercus (oak), as well as chinquapin, chestnut, and Lithocarpus. In laboratory tests, apples (Malus spp.) have also been shown susceptible. The first symptoms are a slight crinkling and paling of leaves, followed by progressive wilting, bronzing, and browning of leaf blades from the margins to the midribs. D e f o l i a t i o n o c c u r s progressively downward and inward throughout the tree. Once infected, red oaks almost never recover, and are usually killed within four to eight weeks after symptom expression first appears. Infected white oaks and burr oaks may persist for many years with only diseased branches gradually dying CUSTOM BUILT FENCED YARD EDGEBROOK HEIGHTS 3 bedrooms, 2 baths, full basement $36,900 3 bedrooms, full basement $32,500 DOUBLE LOT 4 bedrooms, full basement, ^fireplace. $49,900 RAISED RANCH 4 bedrooms, full basement $41,900 Lower level finished. 3 bedrooms up. $37,500 BULL VALLEY COUNTRY UVING $32,900 THREE ACRES 2 acres, 3 bedroom ranch, indoor New carpeting throughout. 3 bedrooms 4 bedrooms, access to Fox River swimming pool. $57,500 $30,000 $45,000 SIGN OF GOOD VALUE IN REAL ESTATE ~ OPEN EVERYDAY k CALL ANYTIME NORTHERN ILLINOIS REALTY SERVICE NORTHERN ILLINOIS REALTY SERVICE NCORPORATED 815-385-2340 3815 WEST ELM ST. (RTE. 120) McHENRY, ILLINOIS INCORPORATE! 815-385-2340 Member of all major multi-lists in McHenry County & National Multi-List. I icing a staghead effect. ie initial internal symp­ toms include the formation of gums and tyloses (blockages) in the xylem (water conducting cells.) Shortly after wilting begins, mycelial mats develop between the bark and the wood. (A symptom? No, a sign). The pressure exerted by these mats causes the bark to crack. Covered with perithecia, the mats emit a characteristic sour odor which attracts many species of insects including nitulid beetles, fruit flies, brontids, springtails, and bark beetles. Although it is believed that these insects after becoming contaminated with ascospores (produced by perithecia) and conidia (born at the tips of hyphal strands) serve as the major long range vectors of Ceratocystis fagacearum, conclusive evidence has never been ob­ tained. Birds are also suspected carriers of the pathogen; but, like inserts, definite proof of their role is* lacking. Local spread of oak wilt is largely through root grafts. In this manner, one infected tree has been shown capable of causing infection for fifty feet. Interspecific oak grafts are quite common, and, un­ doubtedly, are of considerable importance in the spread of the disease. Since, unfortunately, there are, at this time, no accepted chemical protective or eradicative control measures, infected trees should be removed immediately, and their stumps killed with amino- triazole. Peeling the bark off infected stumps or dead trees, if the latter cannot be removed immediately, will cause mycelial mats to dry out; and thus, decrease the amount of available inoculum. Native to Siberia and the Far East, Ceratocystis ulmi, the Dutch elm disease fungus, is a perfect example of the catastrophic consequence that can occur when a pathogen is transported outside its native range, and relocated in a favorable climate teeming with a new, highly susceptible host. Brought into Europe during the First World War, and from there to the United States, Dutch elm disease has probably received more publicity than any other tree malady. Free from its natural predators - parasites, Ceratocystis ulmi has, since its discovery in Ohio in 1930, been responsible for the rapid demise of thousands of stately American elms .(Ulmus americana). Lacking inbred resistance, newly infected trees begin showing symptoms in late May. The acute form of the disease is characterized by sudden and severe wilting. Frequently, leaves wilt, dry, and curl so rapidly that they drop while still green. Chronic disease symptoms, on the other hand, appear gradually, with only individual branches or "flags" defoliating. In any event, diseased trees almost, if not always die. When an infected twig is cut across, the vessels (water conducting tubes) show up dark brown or black in color. As was the case with oak wilt, the abnormal color results from the cells being clogged with tyloses, and brown, gummy substances. Although the production of tyloses is thought to be stimulated by a toxin secreted by the pathogen, these symptoms are not dependent on the physical presence of hyphae. Ceratocystis ulmi lives in the sapwood, fruiting in cracks located between the wood and loosened bark, as well as in beetle galleries found in the wood. The spores are produced on small, black, match stick­ like structures topped by sticky, yellowish white heads called coremia. Embedded in each head are vast numbers of pear-shaped spores. Although the smaller European elm bark beetle TO PLACE. YOUR CLASSIFIED Phone 385-0170 (Scolytus multistriatus is chiefly responsible for the spread of Dutch elm disease, Hylurgopinus rutipes, our native elm bark beetle, may also be of considerable im­ portance. When the adult beetles emerge from their galleries under the bark of dead or dying elms in late May, their bodies are covered with the sticky coremia spores. The beetles unintentionally deposit these spores in wounds which they create while feeding in the crotches of young twigs, or leaf axils of nearby, healthy elms. Although the beetles feed on healthy wood, usually within two hundred feet of the tree from which they emerge, these "Typhoid Mary's" of the plant disease world breed only in weakened or dying ilm trees. Natural infection may also occur through root grafts. Control is often, and probably realistically, only a delaying action. Because the elimination of all potential breeding material within seven hundred feet of trees to be protected is critical, any weakened elm, no matter what the cause, should be removed. Such material should be burned or debarked. Once thought to be headed for oblivion, the majestic American elm is now reaping ihe fruits of massive research programs. Recently, a fungicide called benomyl has shown great promise in protecting elms against in­ fection by Ceratocystis ulmi. Should you have a question, or just a horticultural point of information you would like verified why not drop me a line? The address: McHenry County College, 6200 Northwest Highway, Crystal Lake, Illinois 60014. Suggestions on future topics are always appreciated. s>:>; PATZKE HEATING AIR CONDITIONING FURNACES GUTTERS. PHONE 385-5534 McHENRY EARL R. WALSH & JACK WALSH INS. F i r e , A u t o , F a r m , L i f e R e p r e s e n t i n g R E L I A B L E C O M P A N I E S 3 4 7 9 W . E l m S t . , M c H e n r y 3 8 5.3300 DENNIS CONWAY A U T O L I F E F I R E State Farm Ins. Co. 3 3 1 5 W . E l m S t . M c H e n r y , I I I . 3 8 5 5 2 8 5 o r 3 8 5 7 1 1 1 McHENRY LETTER SERVICE M i m e o g r a p h i n g T y p i n g A d d r e s s i n g M a i l i n g L i s t s 3 5 0 9 W P e a r l S t . , M c H e n r y P h 3 8 5 0 2 5 8 , 3 8 5 8 0 2 0 M o n d a y t h r u S a t u r d a y Farm Equipment George P. Freund,lnc. Case - New Holland 4102 W. Crystal Lake Rd. McHENRY Bus. 38W420 Res. 385-0227 AIR CONDITIONING SALES & SERVICE U-HAUL Trailers & Trucks COMPLETE AUTOMOTIVE & TRUCK REPAIRING ARC & GAS WELDING Guettler Service, Inc. 818 N. Front Street 385- 9831 McHENRY HOBBY SHOP FOR ALL YOUR MODELING NEEDS 3318 W. Elm (NEAR RIVERSIDE DR. McHENRY) 385-7122 DR. LEONARD BOTtARI 1 3 0 3 N . R i c h m o n d R d . , M c h / e n r y E y e s e x a m i n e d C o n t a c t L e n s e s G l a s s e s f i t t e d M o n , T u e s , T h u r s , F r i . 4 6 p . m . T u e s , T h u r s , F r i 7 9 p . m . S a t . , 9 : 3 0 t o 3 0 0 ' P h 3 8 5 4 1 5 1 o r 3 8 5 2 2 6 2 DR. ROBERT 1 PETERSON Optometrist General Practice Contact L en ait, By AppointmenHOniy Closed Thursday 4719 W. Route 120, McHenry 385-7930 McHENRY COUNTY OFFICE MACHINES SALES SERVICE & RENTALS Mon Sat9 5:30 Friday til 9:00 93 Grant St., Crystal Lake Ph 459 122^ RIVERSIDE OFFICE SUPPLY Furniture - Supplies 1 3 2 3 N . R i v e i j s i d e D r i v e M c H e n r y , I l l i n o i s 6 0 0 5 0 ADVERTISE IN THE McHENRY PLAINDEALERi llRELU RADIAL TIRES FOR ALL CARS Europa Motors Inc 231Q Rte. «120 3 1 5 - 3 8 5 - 0 7 0 0 ED'S STANDARD SERVICE STANDARD) EXPERT TUNE-UP ATLAS Tires, Batteries, Accessories QUALITY American Oil Products PH. 385-0720 3817 W. ELM STREET • RADIATORS • Cooling System Specialists it AIR CONDITIONING • Trailer Hitches Fabrication • STEEL SALES • Welding & Ornamental Iron • Frozen** Pipe Thai/ving 3o°6 ADAMS BROS. -- W * 385-0783 Rte. 120 McHenry (Next to Gem Cleaners) ROOFING--REPAIRS Richard Sogers 385 5839 Call Saturday, Sunday or After 5:00 on Weekdays BY THE SEA WOODED LOT 3 bedrooms plus full basement $26,500 By the beautiful sea $36,900 3 bedrooms, family room, 2 car garage. ( V (/£?•<$> mm subject NORTHERN ILLINOIS REALTY SERVICE REAL ESTATE REAL ESTATE REAL ESTATE REAL ESTATE NORTHERNJLLJNOIS REALTY SERVICE A r o u n d T h e ' By Matthew Rosen Instructor of Ornamental Horticulture McHenry County College Fortunately for us, most plants are resistant^or immune to the vast majority of biotic stress factors. Can you imagine the tremendous problem far­ mers and nurserymen would have if their crops, instead of being susceptible to only a handful of maladies, were to devastation by one i or more disease agents. Why, food prices would be even higher than their current record levels, and many ornamental plants would be priced right off the market. Yet, despite this vast amount of inborn resistance, and an­ nual multi-million dollar pathological - breeding programs some plant diseases still pose serious problems. Why? Let's examine the history of probably the two most im­ portant maladies affecting trees in McHenry county, oak wilt and Dutch elm disease. Closely related, almost kissing cousins in fact, the fungi responsible are highly efficient tree killers. Caused by Ceratocystis fagacearum, oak wilt is currently known in twenty FIND JUST THE RIGHT HOME FOR YOUR FAMILY WITH 385-0170 A PLAINDEALER CLASSIFIED ~~Jyair adV PAGE 16-PLAINDEALER-FRIDAY, JULY 13. 197,1 GLAUCOMA SCREENING UNIT--McH^nrv will be the scene of activity such as shown above when the mobile glaucoma screening unit visits the city this month. Sponsored locally by the Lions club, the unit will be located at the Market Place parking lot from 9 a.m. to noon and 1:30'to 4:30 p.m. Thursday, July 19. , WHISPERING OAKS 2 bedrooms, fireplace, llh car garage $39300 ON ONE LEVEL