Massenauftreten der HaubennetzspinneTheridion ovatum Clerck(Theridiidae, Arachnoidea) an Lindenjungpflanzen

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Art, Anteil und Verteilung niedrig molekularer Kohlenhydrate in der Rotbuche (Fagus sylvatica Linn)

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Early Encoppicements in the New Forest

This paper traces the history of silvicultural management inthe New Forest prior to the establishment of the first plantationsdevoted solely to the production of oak for shipbuilding inthe early eighteenth century, and considers the origin of thepresent structure of the unenclosed woodlands of the Forest.     

III. Buchbesprechungen

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Seasonal influences upon the pod weight of cacao and their consequences for selection

In a previous publication about the selection of cacao in West New Guinea, directions have been given on the production determination of individual trees. It was tacitly assumed that the pod weight of a given tree, although variable, would not change systematically with time. However, new data brought to light that this assumption was wrong. It was established that during the main harvest the average pod weight was considerably lower than during the remaining months. But as these changes of weight appeared to have no influence on the quotient pulp weight/pod weight, the method of production determination mentioned needs no revision.Present address: University of Science and Technology, Kumasi, Ghana.     

A test method for resistance to stem mottle in potatoes

In breeding for resistance to stem mottle in potatoes there is a need for a rapid testing and selection method. Following the method normally used with X- and Y-virus, seedlings in the cotyledon stage and young plants of potatoes were inoculated with the stem mottle virus (= rattle virus). In this way it seems possible to test and to select young seedlings for resistance. In addition it is possible to establish rapidly the resistance of known potato varieties and progenitors with the air of young plants.     

Professor Dr. Johannes Weck

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Professor Ludwig Fabricius 90 Jahre

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