be weakened or stunted, but little damage occurs. Severe infections may cause 

 premature leaf drop. This disease is not seed-borne. 



2. Yellow leaf blotch- -This disease shows up as yellowing of the leaf margins or 

 along the veins. As the disease progresses, the yellow areas turn orange and 

 small dark dots (fungus fruiting bodies) may be seen. 



3. Pseudoplea spot- -Small, sunken, irregular black spots form on the leaflets. 

 These areas become black-dotted and sunken with gray centers and reddish-brown 

 margins as the disease advances. 



4. Stemphylium leaf spot - -The fungus that causes this disease can overwinter on 

 seed as well as in plant debris. Early infections appear as small, irregular, 

 dark-brown, sunken spots. Later the spots enlarge, become target-like and are 

 often surrounded by a yellow "halo." Infected leaves often turn yellow and 

 may fall prematurely. 



Control: Losses from common leaf spot, yellow leaf blotch, Pseudoplea spot, and 

 Stemphylium leaf spot can be limited by good cultural practices. Sow certified 

 disease- free seed, cut infected stands in early bloom before leaves fall, and grow 

 high-yielding, resistant varieties. 



More information can be obtained from your county Extension adviser. Or write to 

 the University of Illinois Department of Plant Pathology, Urbana, Illinois 61801. 

 Ask for RPD No. 301, "Leaf and Stem Diseases of Alfalfa." 



READ THE LABEL AND FOLLOW ALL PRECAUTIONS 



Read and follow the precautions but also be sure to put pesticides, and all poi- 

 sonous materials for that matter, out of the reach of small children and people 

 who are not responsible for their actions. 



This weekly report was prepared as follows : 



INSECTS: H.B. Petty, Steve Moore, Roscoe Randell , Don Kuhlman, and Tim Cooley , 

 College of Agriculture , University of Illinois at U rbana- Champaign , and the Il- 

 linois Natural History Survey. 



PLANT PATHOLOGY: M.C. Shurtleff and Ed Burns, Department of Plant Pathology. 



WEEDS: Ellery Knake and Marshal McGlamery , Department of Agronomy . 



AG COMMUNICATIONS: Ray Woodis . 



The information for this report was gathered by these people, staff members, 

 county Extension advisers, and others, in cooperation with the USDA Agricultural 

 Research Service, Plant Pest Control Branch. 



