Ill 



FUNGI FOUND DAMAGING BOTH USEFUL PLANTS 



AND WEEDS. 



PERONOSPORACEAE. 



PKRONOSPORA EFFUSA, [Grev.] Rabenh. Downy mildew of goose- 

 foot and spinach. On leaves of goosefoot [Chenopodium 

 hybridum and C. album], said spinach [Spinacea oleracea]. 

 Plentiful. The fungus has been exceedingly destructive to 

 all hosts this season. The spinach was completely ruined, 

 much of it being killed before ^oing to seed, and nearly all 

 rendered unfit for use. Though this fungus is very useful in 

 injuring the weeds it is one of the worst enemies that the 

 spinach growers have to contend with here. 



PERONOSPORA PARASITICA, [Pers. ] DeBary. This mildew has been 

 common on all of our cruciferous weeds, as the mustard, and 

 peppergrass. In some cases it has been very damaging to 

 them. It was also troublesome to the radishes in the garden 

 but did little damage to them. 



PYEENOMYCETES. BLACK FUNGI. 



CLAVICEPS PUEPUREA, [Fr.] Tul. Ergot Common on wheat grass 

 (Agropyrum glaucum), quack yrass (Ag. repens), and wild 

 rye (Klymus canadensis}. It has been especially destructive 

 to the wheat grass and quack grass- Hardly an un- 

 jured head of either species could be found on the 

 college grounds. Here where these grasses are weeds 

 the fungus is beneficial in its effects, but in some parts 

 of the state, especially the West, where the wheat grass is one 

 of the forage grasses, it is very injurious wherever it occurs, 



