hazard in relation to soybeans, vegetables and ornamental flowers, shrubs, and trees 

 with the phenoxy herbicides (2,4-D, 2,4,5-T fenoprop or dichloroprop) . Using Animate-: 

 (AMS or ammonium sulfate) presents less of a drift hazard than with the phenoxy herbil 



cides . 



THE CURRENT PICTURE 



PLANT DISEASES 



To provide insight about the plant diseases currently appearing in Illinois fields anc 

 gardens, here is a list of ones that were diagnosed in our plant disease clinic this 

 week: 



Host plant 



Disease 



Number of 

 specimens 



More information 

 available in RPD* 



4 

 3 

 9 

 1 

 1 



504 

 500 

 502 

 502 



1 





1 

 1 



114 



3 



301 



2 

 1 



1 





2 



905 



1 

 1 



803 

 801 



1 

 1 



908 



929 



Soybeans. Rhizoctonia root rot 



Pythium damping-off 

 Bacterial blight 

 Bacterial pustule 

 Chemical injury 



Com Pythium root rot 



Oats Covered smut 



Bird damage 



Alfalfa Common leaf spot 



Grapes Black rot 



Anthracnose 

 Chemical injury 



Muskmelons Bacterial wilt 



Apples Apple scab 



Fire blight 



Peppers Early blight 



Fusarium root rot 



*Reports on Plant Disease. Copies are available free on request from the Department 

 of Plant Pathology, 218 Mumford Hall, Urbana, Illinois 61801. 



BACTERIAL LEAF BLIGHT ON SOYBEANS 



The plant disease clinic has received many soybean specimens this week. The disease 

 diagnosed most often was common leaf blight. This bacteria- caused disease is enhanced 

 by cool, rainy weather. It diminishes rapidly with hot, dry weather. Bacterial bligh 

 appears as a set of small, angular yellow spots with water-soaked centers. These late 

 turn brown-to-black, and may tear or drop out. Heavy infection may cause premature de 

 foliation. 



The causal bacteria are seed-borne and may overwinter in dead leaves. Seedlings grow 

 from infected seed are stunted and blighted, and usually die prematurely. For more inl 

 formation, write for Report on Plant Disease No. 502. 



