. Bulletin. Natural history; Natural history. 230 Illinois Natural History Survey Bulletin Vol. 33, Art. 3. Fig. 2. - Abiotic stresses as primeiry factors affecting Dli- nois trees. (AlOak decline in northern Illinois. (B) Injury from lawn herbicide on yew. (CI Loss of roots during trans- planting. (D) Iron chlorosis symptoms on pin oak leaves. extent on sweet gum, white oak, bald cypress, river birch, red maple, and hackberry. Several Stirvey pathologists have investigated the cause and control of the chlorosis problem. Soil tests from areas of chlorotic trees have consistently shown that chl
. Bulletin. Natural history; Natural history. 230 Illinois Natural History Survey Bulletin Vol. 33, Art. 3. Fig. 2. - Abiotic stresses as primeiry factors affecting Dli- nois trees. (AlOak decline in northern Illinois. (B) Injury from lawn herbicide on yew. (CI Loss of roots during trans- planting. (D) Iron chlorosis symptoms on pin oak leaves. extent on sweet gum, white oak, bald cypress, river birch, red maple, and hackberry. Several Stirvey pathologists have investigated the cause and control of the chlorosis problem. Soil tests from areas of chlorotic trees have consistently shown that chlorosis is generally associated with pockets of alkaline clay soils, quite common in urban areas in the north- ern part of the state (Schoeneweiss 1973). The yellowing of leaves, with veins remaining green, is a typical symptom of iron deficiency and can be corrected by treating plants with cer- tain iron-containing compounds if the iron is in the proper form (Wallace 1971). Field research has centered around both soil injection and direct trunk implantation of iron compounds. Trunk implantations with ferric citrate and ferric ammonium citrate were found to be effective on pin oak, red oak, and swamp white oak; cypress; and sweet gum (Neely 1973; Himelick & Himelick 1980). These compounds are now commercially available in Medicaps"^ and are being used nation- ally to correct chlorosis by commercial arborists, nm-serymen, and operators of fruit orchards. Applications of inor- ganic iron compounds to the soil, prior to the 1960's a standard recommenda- tion, was totally ineffective in the alka- line clay soils of Illinois. However, pres- sure injection of liquid organic com- pounds, known as iron chelates, cor- rected even advanced stages of chlor- osis in highly alkaline soils for 3 or more years (Schoeneweiss 1973). Either treatment may be used for iron chlor- osis in Please note that these images are extracted from scanned page images that may have been digi
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