Symptoms 



Peziza Willkommii. Plant larch in suitable 

 positions, weU drained and not subject to spring 

 frosts. Avoid planting very large breadths of 

 larch only. Some species of Larix, e.g. L. 

 leptolepis, are more resistant than the common 

 larch, L. europaea. 



Lathyexts. See Sweet Pea. 



Laitrel. 



Foliage and Young Shoot. — Grepsh-white 

 mould on the foliage, especially young foliage. 

 Mildew due to SpJiaerotheca pannosa. Dust 

 plants with flowers of sulphur or spray with 

 Uver of sulphur (7). 



Lavateea tbimestris. 



Stem and Foliage. — Yellowish-brown rounded 

 spots on leaves, long spots on stems with a 

 darker margin. Due to Colletotrichum mal- 

 vacearum. Destroy afEected plants as soon as 

 seen, and spray remainder with Bordeaux 

 mixture or liver of sidphur (7). The disease is 

 liable to be carried in the seed. The same 

 fungus attacks and kiUs hollyhocks in America. 



Lettuce. 



Drop disease. The whole plant withers. 

 Attacked by fungus {Botrytia sp.) at base of 

 stem. Measures, see below. 



Foliage. — YeUowish spots on foliage, with 

 white velvety fimgus upon them on under side. 

 Leaf subsequently rots. Rot mould due to 

 83 



