"May 1980.""University of Illinois College of Agriculture Cooperative Extension Service and Vocational Agriculture Service, Urbana, Illinois.""Picture sheet no. 150.

University of Illinois Extension

University of Missouri: MOspace

1. Frost injury 4. Linuron, preemergence CORN HERBICIDE INJURY I 2. Insect damage 5. Acetanilide herbicide injury 6. Underground leaf unfurling f>S ISO 3. Cyanazine, preemergence 7. Thiocarbamate herbicide injury 8. Pendimethalin, preemergence 9. Alachlor and dicam- 10. Benzoic acid herbicide injury ba, preemergence UNIV l~ RSITY OF ILLINOIS COLLEGE OF AGRICULTUR E COOPERATIVE 1-.xn: NS ION SER VICE HERBICIDE INJURY NO. I MAY 1980 URBA A, ILLINOIS and VOC'ATIO AL AGRICULTURE SERVICE CORN HERBICIDE INJURY I 1. Frost injury - Information on environment-al conditions prior to appearance of injury symptoms is necessary, since environmental stress may cause symptoms that might be con-fused with herbicide injury. 2. Insect .damage - Factors such as dry soil conditions, sha llow planting, insect damage, or disease may also cause symptoms or problems confused with herbicide injury. 3. Cyanazine, preemergence - Chlorosis and necrosis of corn leaves, beginning at the leaf tips, may result from over application of cyanazine (Bladex) applied preemergeence. Injury may occur under prolonged cool, wet stress con-ditions. Avoid use of cyanazine on sandy soil or soils very low in organic matter. 4. Linuron, preemergence - The risk of injury to corn from soil-applied treatments of linuron (Lorox) is usually considered too great to recom-mend its use for corn. Plants appear stunted with yellowing and necrosis of the leaves from the tips back. 5. Acetanilide herbicide injury - Excessive rates of alachlor (Lasso) or metolachlor (Dual) may cause improper unfurling of corn leaves. Corn seedlings may appear malformed and stunted. Injured plants usually outgrow this damage once emerged. Injury may be confused with corn germ injury or crusting. 6. Underground leaf unfurling - Germinating corn affected by excessive rates of Lasso or Dual may result in plants leafing out underground. The problem may become more severe with deep planting, soil crusting, and certain sensitive corn hybrids. 7 . Thiocarbamate herbicide injury - Thiocar-bamate herbicides such as butylate (Sutan) or EPTC (Eptam) may cause stunting, twisting, and knotting of some corn plants. Sutan+ and Eradicane have a "crop safener" in the formu-lation. This reduces but may not eliminate the risk of injury, especia lly with certain sensitive corn hybrids. 8. Pendimethalin, preemergence - Pendimeth-aline (Prowl is a dinitroaniline herbicide that should only be surface-applied (preemergence) for cortl and not incorporated. If incorporated, pendimethalin may cause pruning and stunting of corn roots. 9. Alachlor and dicamba, preemergence - Pre· emergence combinations of alachlor (Lasso) or metolachlor (Dual) and dicamba (Banvel) should only be used on soils relatively high in organic matter and under conditions favorable for rapid corn emergence and growth. Since any one of these herbicides may cause injury when applied alone, the combination may result in symptoms of acetanilide and/or benzoic acid herbicide injury (No. 5 and 10) . 10. Benzoic acid herbicide injury - The primary root system of corn may show proliferation and appear stubby where excessive rates of dicamba (Banvel) applied preemergence have accumu-lated over the germinating seed. Other benzoic acid herbicides, such as chlor-amben (Amiben), which is also a benzoic acid herbicide, may cause a proliferation of stubby roots as well as stunting of t he corn plant. Photo credits: Joe Paul Downs, Michael D. K. Owen, Ellery L. Knake, Marshal D. McGlamery ; University of Illinois at Urbana-Champaign, Extension Agronomists. Subject Matter : Joe Paul Downs, University of Illinois at Urbana-Champaign, Extension Agronomist, Review by Marshal D. McGlamery, Agronomy Dept., University of 1 llinois at Urbana-Champaign. Graphic Design : Martha Martin. The Illinois Vocational Agriculture Service provides equal opportunities in programs and employment. Ahive vrsio -- Se xtension.missuri.du

Corn herbicide injury I (1980)

Abstract

Similar works

Full text

Available Versions

University of Missouri: MOspace