PLATE 29 



Spikelets of Wisconsin No. 14 oats: 



A.— Left and center spikelets show natural infection with halo-blight. Tips 

 yellowed and translucent. Spikelet at right normal, unspotted. Photographed 

 July 17, 1918. 



B.— Upper spikelet shows typical isolated halo lesion near base. Lower spikelet 

 normal, unspotted. 



