752 



FUNGI 



being at the same time forcibly ejected into the air and carried 

 to the young bines and leaves growing near the ground. AVe 

 thus see why it is that 'hop-mould generally commences close 

 to the ground and spreads upwards, and why there are ' mouldy 

 places' in gardens where the disease begins almost every 

 year. 



Prevention and Remedy. — (a) Although the complete de- 

 struction of ' hop-mould ' is unattainable, every effort should be 

 made to diminish its prevalence by burning all badly affected 

 bines and leaves. This practice should especially be carried out 



Fig. 255. — A, Perithecia (/) with appendages (//) of hop-mould (enlarged 12 

 diameters). 



^, A single perithecium which has been burst ; a ascus ; j ascospores 

 (enlarged 80 diameters;. 



C, A single free ascus (a) with ascospores (s) within (enL-u-ged go diameters). 



in cases after a bad attack where the hops have been not worth 

 picking on account of ' mouldiness.' The bines should on no 

 account be left lying about, as the spore cases are produced in 

 thousands and fall upon the ground only to remain a certain 

 source of infection for succeeding years. 



The application of gypsum to the soil is said to be beneficial 

 in such circumstances, but no trustworthy experiments upon 



