The rampant spread of the invasive alien plant Parthenium hysterophorus (Asteraceae) in subtropical South Africa prompted research into biological control methods more than a decade ago. Parthenium impacts broadly on agriculture, biodiversity conservation and health. Elsewhere, significant control...

This manual contains detailed biological descriptions of the major characteristics of some weed species found in Trinidad, including Axonopus compressus, Brachiaria mutica [Urochloa mutica], Commelina diffusa, Cyperus rotundus, Echinochloa colonum [E. colona], Eleusine indica, Parthenium...

Chromolaena odorata (L.) King & Robinson (Asteraceae), an invasive alien plant of terrestrial habitat in many tropical and sub-tropical regions of the world, was investigated in the South-West Ecological Zone of Nigeria. Investigations, including field observations on C. odorata and a survey of...

Relative amounts of nutrients, especially nitrogen, the most abundant macro-element, and also the distribution of ammonium ions in relation to nitrate ions, in the soils of different ecosystems, are determined by many factors. The most important are: temperature, pH of substrate, accumulation of...