ASCOCHYTA 431 



Aspidistra leaf blotch. Large, irregular, bleached patches 

 are produced on living leaves of Aspidistra lurida by Ascochyta 

 aspidistrae (Mass.). The perithecia are grouped in blackish 

 streaks which run across the leaf and not along its length. 

 Spores narrowly fusiform, i-septate, 12-17 x 2_2 '5 I'- 



Diseased leaves should be removed. 



Violet leaf blotch {Ascochyta violae, Sacc.) forms large, 

 circular, brown or yellowish patches on living leaves of the 

 sweet violet ( Viola odorata,) and other cultivated species. 

 Spores cylindrical, i-septate, 10-11X3-4/^. The dead spots 



iP 



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Fig. 134. Ascochyta pisi. 1, pod and leaflet of 

 garden pea attacked by fungus ; 2, section through 

 two conceptacles of fungus ; 3, conidia. Figs. 2 and 

 3 mag. 



become yellowish-white, dry up, and often fall out. A very 

 destructive disease. 



Favoured by excess of moisture. The diseased leaves 

 should be removed on their first appearance, otherwise the 

 disease spreads quickly, the spores being spread by watering 

 or syringing. 



Pea spot {Ascochyta pisi, Lib.) every now and again appears 

 under the form of an epidemic, attacking cultivated peas, 

 haricot, and French beans, also wild plants belonging to the 

 pea family, as Vicia, Cercis, etc. It is most frequent on 



