498 



FUXGI IMPERFECTI. 



exhibit reddish or yellow spots ; therein the mycelium spreads 

 rapidly and gives off tufts of conidiophores which rupture the 

 epidermis. The conidiophores are septate, branched, and give 

 off chains of unicellular oval conidia. Meanwhile the affected 

 fruit becomes rotten and gradually shrivels up, it remains, 

 however, hanging on the tree throughout the winter. During 



Fig. 30C\—MoHilia fructigena 

 more or less concentric lines, 

 attack, (v. Tubeuf del.) 



A, Apple showing the grey conidial patches as 

 S, Young Peach, slnivelled up in consequence of 



next spring, when the fruit is again moist, further conidia are 

 given off'. Infection takes place by wounds or even through 

 the epidermis of young leaves and blossoms. The conidia have 



Fio. 307. — Monilui fructigena. Branched conidiophore with chains of conidia. 

 ", Branched hypha of MonUia in the tissue of an Apple, (v. Tubeuf del.) 



been found to retain their vitality for two years. Smith ^ 

 found that twigs were also affected by the disease, so that a 

 gummy degeneration took place in the soft bast and cambium. 

 As remedial measures, the gathering of all diseased fruit left 

 hanging over winter is strongly recommended. This, as well 

 as other diseased parts, should be l)urned as soon as possible. 



' Smith (Ervvin), Journal of Mycology, vii., p. 36. 



