Bui. 957, U. S. Dept. of Agriculture. 
Plate IV. 
Leaves of Ribes Infected With Cronartium ribicola, Showing Different 
Types of Attack. 
Fig. i._ Lower surface of a leaf of Ribes aureum infected bv Cronartium ribicola. Note the charac- 
teristic isolated infected areas, with the abundant uredinia closely crowded together Fig 2—\ 
Ribes bud with a single leaf which bears normal uredinia. This leaf is relatively old ' bem> 
stunted m growth by adverse conditions which have held it stationarv for several week-; Fig 3-^- 
Lower surface of an infected leaf of Ribes vulgare, horticultural varietv White Transparent Note 
the large infected areas merging into a single one. The uredinia'are not so clo^elv crowded 
together as m figure 1 Fig. 4.— Lower surface of an infected leaf of Ribes nigrum ' Note the 
general distribution of the telia, their grouping closely together, and their vigor of growth 
