The reactions of the xylem of Ulmus hybrids were studied after injecting branches with a spore
suspension of Ophiostoma ulmi (Buism.) Nannf. Discolouration of the walls of the vessels …

Eenige niets zeggende namen zijn in het buitenland gebruikt om necrose-verschijnselen in
aardappelen aan te duiden:„Eisenfleckigkeit",„internal brown spot",„internal rust spot". Niets …

Phytotoxic material has been isolated from liquid cultures of Ceratocystis ulmi. One
component of the material has been obtained in pure form and has proved to be a rather …

On strawberry leaves Cladosporium herbarum and Botrytis cinérea were predominant, the
latter fungus occurring in comparatively large numbers even on green leaves without disease …

The oak mildew invaded Western Europa in the years 1908 and 1909. Since then this parasite,
Microsphaera alphitoides Griff. & Maubl. (syn. M. quercina (Schw.) Burr.) has occurred …

Johanna Westerdijk," Hans" to her friends, was born over a century ago on January 4, 1883,
in Amsterdam, where her father was a general practitioner. Her mother's family came from …

1. Introduction. There is an extensive literature dealing with the influence of environmental
conditions on the development of the rice plant. The influence of nutrients, temperature and …

Many weeds, includingSenecio vulgaris, are virtually symptomless hosts ofVerticillium albo-atrum.
Plants ofSenecio vulgaris were inoculated with spore suspensions ofV. albo-atrum by …

Met sap van zieke Petunia-en tabaksplanten werden gezonde Atropa-planten geinoculeerd,
die na vijf tot zes dagen de oorspronkelijke symptomen vertoondem Dit gebeurde ook, als …

In 1962 in the Netherlands a foot rot due toNectria haematococcaBerk. & Br. var. Cucurbitae
(Snyd. & Hans.) Dingley occurred inCucurbita ficifolia, the rootstock of grafted cucumber …