298 Eumyeetes. — Pflanzenkrankheiten. 



Phomopsis Cestri auf Zweigen von Cestrus noctumus. Stenocarpella 

 nov. gen. {fungi imperfecti) mit St. Zeae auf toten Spitzen von 

 Zea Mays, Botryogene nov. gen. {fungi imperfecti) mit B. Visci auf 

 Blättern und Sprossen von Viscum Opuntiae. Septoria Merrillii auf 

 Blattern von Buddleia asiatica. Leptostromella Thysanolaenae auf 

 Blättern von Thysanolaena maxima. Peltaster, nov. gen. Pycnothy- 

 viaceanim mit P. Hedyotidis auf Blättern von Hedyotis Elmeri. Me- 

 lanconium Parkiae auf Rinde von Parkia timoriana. Oospora puc- 

 ciniophila parasitisch auf Puccinia heterospora auf Sida javensis. 

 Monotospora parasitica auf Stroma von Catacaumas apoensis auf 

 Blättern von Ficus nervosa, von Phyllachora pseudis Rehm auf 

 Ficus nota. Cercospora extremorum auf Blättern von Homalonema 

 philippinensis . Leucodochium nov. gen. Tubercidariacearum mit L. 

 Fipiuri auf Blättern von Pipturum arborescens. Rippel (Breslau). 



Nowell, W., Internal Disease of Cotton Bolls in the West 

 In dies. (West Indian Bull. XVI. N° 3. p. 203—235. 1917.) 



This paper deals with the facts at present known with regard 

 to a disease of cotton bolls in the West In dies, characterised by 

 the progressive staining and rotting of the lint in green unopened 

 bolls of healthy external appearance. 



Such staining has been shown to be due to infection of the 

 contents of the boll with certain fungi and bacteria. The author 

 reviews previous literature, and describes investigations as to the 

 extent and cause of the disease in the Wes t Indies. Experimental 

 evidence is brought forward to show that the occurrence of the 

 disease depends on the infection of bug punctures. It seems most 

 probable that the infecting organisms are carried by the bugs 

 themselves. 



Under ordinary conditions fungoid infections greatly predomi- 

 nate over those due to bacteria, but under circumstances which 

 appear to be connected with wet weather the proportion of the 

 latter may he largely increased. 



Uninfected bug punctures produce small, dead brown patches 

 of lint in young bolls only; the punctures are further characterised 

 by the occurrence of proliferated tissue on the inner surface of the 

 carpels and on punctured seeds, and by the death of a certain 

 number of seeds in bolls severely attacked. The returns of stained 

 lint are due, in varying proportions, to infection of the punctures 

 by a) internal boll disease, and b) ordinary bacterial boll disease. 



The varying incidence of the disease is shown to depend in 

 general on the relation between the time of planting, the length 

 of the crop period, and the time when infestation with bugs or 

 „cotton-stainers" occurs. The infestation of the cotton fields with 

 stainers originates from waste land on which their wild food-plants 

 exist. The principal food-plants on which the stainers breed freely 

 out of the cotton season, are the silk-cotton tree (Eriodendron) , and 

 the mahoe (Thespesia); they also breed to some extent on various 

 malvaceous herbs or shrubs. They feed, without breeding, on a 

 large variety of other plants. 



The manner in which the infecting organisms are carried over 

 from one cotton season to another is not known. 



E. M. Wakefield (Kew). 



