Union Catalogue of Agricultural Libraries in the Netherlands
The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.
Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.
The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.
As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".
All titles are entered in their original language. Keywords are added to facilitate subject searching.
The database is updated every day and now contains over 830.000 records.
Macroscopic and microscopic symptoms of leaf-roll disease of potatoes were extensively discussed in an analysis of the cause. Infected plants, derived from healthy tubers, frequently showed no symptoms during growth. Sometimes signs of discolouring and of rolling could be detected, first in the uppermost leaves, but they were not distinctive for this disease. If the seed potato was already infected, leaves, first the lowest, hardened and rolled about 30 days after the plant came up. This was preceded by a disturbance of starch breakdown. After the external symptoms necrosis of the phloem always developed and was specific. Information on the abnormal action of certain enzymes in diseased plants was reviewed.The disease was contagious during growth. Transfer was by lice and probably also bugs. Another possibility was transfer within the soil. The rapidity of spread depended largely on still unknown environmental conditions. Control was sought first in the possibility of breeding less susceptible varieties, as there were great differences in susceptibility.
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