A workshop on plant viruses and mycoplasmas brought together scientists and researchers working on these microorganisms in the countries of eastern Asia, and enabled them to discuss their studies, to exchange ideas, and to become familiar with their counterparts These proceedings of the workshop contain papers which include country reports,…

Presents directions for an activity designed to illustrate the function of plant nutrients. (PEB)

The paper presents a generalized life history of the goldenrod ball gall, a ball-shaped swelling found almost exclusively on the Canada goldenrod, Solidago canadensis, and caused by a peacock fly know as Eurosta soldiaginis. (KM)

Describes an ecology exercise suitable for secondary school students in which the school grounds may be used to study communities in association with woody plants. (JR)

Describes the construction and operation of a network of entirely passive electrical components that gives a response to an electrical shock similar to an action potential. The network of resistors, capacitors, and diodes was developed to produce responses that would mimic those observed, for example, when a dark-grown pea epicotyl is shocked…

The file organization for the computerized Flora North America (FNA) data bank is described. A four level character hierarchy allows subdivision of any flora description into as many as four levels in order to specify plant character precisely. Terms at any one level will not necessarily be parallel in status. Both PLANTS and LEAVES serve as…

This bulletin describes 46 of the more common trees found in Minnesota's forests and windbreaks. The bulletin contains two tree keys, a summer key and a winter key, to help the reader identify these trees. Besides the two keys, the bulletin includes an introduction, instructions for key use, illustrations of leaf characteristics and twig…