NOTES AND ABSTBACTS. 



275 



Melon. — Septoria cucurhitacearum occurs occasionally on musk- 

 melons and on other cucurbitaceous plants. 



Tropaeolum majus was found to be attacked by the white rust, 

 Cystopus candidus, so very common on leaves of cruciferous plants. 



Peach. — A remarkable case of the falling of peach leaves while 

 young and green is referred to, and a severe attack of Sphaerotheca 

 pomnosa in June is reported. 



Pear. — The crimson coloration of pear leaves in autumn in an 

 orchard at Geneva is ascribed to unthriftiness in the trees. A case of 

 oedema in trees stored in a house is described at length, apple, peach, 

 plum and cherry stored in the same house being also affected. No 

 cause could be assigned. Eust, due to Gymno sporangium glohosum, 

 occurs occasionally, some varieties being apparently less susceptible 

 than others. In one orchard considerable loss of gi^afted pears has 

 occurred through the death of the stocks, which is thought to be due 

 to the attack of Sphaeropsis mdlorum, but the evidence does not appear 

 very conclusive. 



Pelargonium peltatum suffered from oedema in a warm, very moist 

 house. 



Phlox was attacked by a species of Cercospora to which the name 

 of C. phlogina Peck has been given. It produces circular brown spots 

 on the foliage, which on the upper surface show a dark brown border. 

 Erysiphe cichoracearum is also recorded on phlox. 



Plum. — The " knots " caused by Plowrightia morhosa are often 

 overgrown by the saprophyte, Trichothecium roseum, and sometimes 

 by Sporotrichum parasiticum.. Sclerotinia fructigena is a frequent 

 cause of the death of twigs and small branches in both ordinary and 

 Japanese plums. In several cases infection had evidently been through 

 the flower stems, and had proceeded dov/n the shoots into the main 

 stems, where cankerous spots, with exudation of gum, had been 

 produced. 



Callirhoe involucrata was badly attacked by Aecidium tuberculatum, 

 which is perhaps perennial in the tissues of its host. No alternate 

 host is known. 



Potato. — The author appears to consider Rhizoctonia {Corticium 

 vagum var. solani) as doubtfully the cause of damage to 

 potatos, though it frequently occurs upon them. Eadishes, 

 however, were found to be dying through the attacks of a Rhizoctonia 

 near the surface of the soil, and pure cultures of the fungus from, 

 Actinidia polygama, Lactuda Scariola, Impatiens sp., cabbage and 

 lettuce were found to be infective to radishes. 



Quince. — The rust, Gymno sporangium clavipes, is sometimes fre- 

 quent upon the quince. 



Ruhus. — A blight of raspben-ies due to Lepiospfiaeria Conio- 

 thyrium- is described, and by cultural experiments the author has demon- 

 strated the fact that, as suspected, Coniothyrium Fuckelii is a stage in 

 the life-history of this fungus. Black patches are produced on the 

 canes, and the disease is very destructive. Botrytis patula is occa* 



T 2 



