Er worden doorgaans twee methoden gebruikt om de dichtheid van graanluizen vast te stellen: directe telling en bepaling van het bezettingspercentage. De nauwkeurigheid van deze twee methoden wordt hier vergeleken bij een constante monstergrootte, die gewenst is bij praktische waarnemingssystemen. De beide methoden zijn even betrouwbaar over een ree...
Significant numbers of the sugar cane froghopper, Aeneolamia flavilatera, are generally not found to be present on sugar cane during the periodically occurring prolonged dry periods. This is primarily attributable to drought induced quiescence in the froghopper eggs, which delays the appearence of the next generation of active froghopper stages. It...
Profiles of target groups (target group segmentation) in the primary prevention of cardiovascular disease (CVD), can lead to an effective target group-directed approach in health education. Objectives in this thesis are: 1) To identify demographic and socioeconomic characteristics of such target groups. 2) To find personal and environmental determi...
Tea is the national drink of Indonesia. The habitual consumption prevents intestinal infections; the production provides many Indonesians with a living. The production is affected by scarlet mites (Brevipalpus phoenicis GEIJSKES), an important pest of tropical and subtropical crops. It is one of the main pests of tea in Indonesia and inhabits virtu...
In this publication are assembled the most important results of a survey carried out in 1971/1972 by the Central Bureau of Statistics as to the number of physically handicapped in the Netherlands, their social circumstances and the use made of and demand for services and facilities. For the purpose of this survey a sample was drawn from the Netherl...
