Soil-borne mosaic appears when wheat starts to grow (about March) , and continues until 

 temperatures are continuously above 75° F. 



A summary of notes taken by Dr. Henry Jedlinski and Charlie Brown of the advanced wheat 

 nursery last week at the Agronomy South Farm in Urbana on soil-borne mosaic showed that 

 even highly resistant varieties were affected. Notes were taken on prevalence (zero to 

 100 percent of the plants) and on the severity of infection (a scale of to 5) . The 

 same wheat varieties found at the Agronomy South Farm were evaluated on May 1 at Browns - 

 town by Drs. Jedlinski and Shurtleff. Soil-borne mosaic symptoms, although somewhat 

 beginning to fade, could be seen on the lower leaves of essentially every plant of 

 every variety. 



Wheat variety 



Triumph 64 . . 

 Pawnee . . . . 



Gage 



Scout 66 . . . 

 Parker . . . . 

 Centurk. . . . 

 Ottawa . . . . 

 Tx 62A2522-8-2 

 Tx 65A1268 . . 

 Bezostaia. . . 

 NE 68437 . . . 

 NE 68440 . . . 

 Purdue 6834. . 



Monon 



Benhur . . . . 

 Arthur . . . . 

 Arthur 71. . . 



Abe 



Knox 62. . . . 

 Timwin . . . . 

 Blueboy. . . . 

 Blueboy II . . 

 McNair 4823. . 

 Mo 7910. . . . 

 Mo 7687. . . . 



Replicate one 



Prevalence (%) Severity (0-5) 



Replicate two 



Prevalence (%) Severity (0-5) 



70 



100 



80 



100 



50 



20 



60 



80 



100 



30 



40 



60 











80 



40 



20 



10 







30 























3 

 4 



2 

 5 

 4 

 2 

 3 

 4 

 4 

 2 

 1 

 3 



20 

 

 



50 



50 

 

 



40 



100 











80 

 

 

 

 



60 

 

 

 

 

 

 

 

 



3 



2 



4 

 3 



Septoria leaf blotch. With the frequent rains and heavy dews, this disease has lit- 

 erally "exploded" in the past week. Look for pale-green dots that soon enlarge to 

 yellow blotches between the veins on lower leaves. The yellow areas later elongate 

 and develop brown centers. Then, several days later, black specks appear in these 

 reddish -brown centers. Septoria is rapidly killing the lower leaves on wheat plants 

 all over the state. The disease will continue to spread upward on the plants as long 

 as the weather remains cool and moist. 



Nitrogen deficiency and wet or "drowned out" spots. These are evident in wheat fields 

 almost everywhere. The loss of wheat from root-rotting fungi under conditions of a 

 water- logged soil is underestimated. It is not uncommon to have N-deficient symptoms, 

 soil-borne mosaic, Septoria leaf blotch, and root rot all on the same wheat plant. 



