Biological and ecological investigations of the pest Valanga in leguminous cover plants under rubber were studied in the laboratory and field. Field studies were carried out by sampling the natural population of Valanga as well as its natural enemy. Tenodera aridifolia. Laboratory studies were based on field observations of the seasonal abundance of adults and nymphs predator-prey relationships to size and susceptibility of nymphal instar and field application reates of selected insecticides in wooden cages. Pueraria phaseoloides was found to be not only an ideal trap-crop for the development of beneficial insects, but also Valanga. For the long-term control of Valanga, efforts should be made in ccontrolling the nymphs before they became adults. Scouting for the presence of nymphs should be made as early as August. In the event of a population outbreak, chemicala control should be exercised to kill adults as well as nymphs. For quick killing of Valanga nymphs which were less mobile, insecticides in descending order of effectiveness were acephate (Orthene 75 S), chlorpyritos (Lorsban 40 EC), methamidophos (Tamaron 50 EC) and dieldrin (Dieldrex 15).