MAIZE DWARF MOSAIC 



A recent survey in southern Illinois revealed a relatively high incidence of maize 

 dwarf mosaic in fields planted with susceptible hybrids. This virus-caused disease 

 first appears as an irregular, light- and dark-green mottling of leaves. The symp- 

 toms are especially prominent during periods of cool weather. Plants showing these 

 leaf symptoms usually become stunted and bushy because of a bunching of the upper 

 internodes. Such plants may become totally barren and may die prematurely. Labora- 

 tory analysis is required for positive diagnosis. 



Control of the two strains (A and B) of this disease is obtained by planting resist- 

 ant varieties. NOTE: Some inbreds resistant to strain A of the virus may be com- 

 pletely susceptible to strain B, and vice-versa. 



READ THE LABEL AND FOLLOW ALL PRECAUTIONS 



This weekly report was prepared as follows : 



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

 lege of Agriculture , University of Illinois at Urban a- Champaign , and the Illinois 

 Natural History Survey. 



WEEDS: Marshall McGlamery , Department of Agronomy. 



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



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. 



