Biochemical aspects of juvenile hormone action in the adult Locusta migratoria

The present study deals with the actions of juvenile hormone in the adult African migratory locust (Locusta migratoria). Juvenile hormone (JH) was known to be essential for a completely normal yolk development in the oocytes of most female insects. No egg production was possible if the corpora allata (small spherical organs near the cerebral complex, which excrete JH) were extirpated. The general metabolism of such 'allatectomized' insects was strongly modified.To find whether JH directly influenced respiratory metabolism, experiments in vitro with mitochondria isolated from flight muscles and fat body were used. No relation existed between JH action and oxygen consumption in vitro. However, a positive effect of JH on oxidative phosphorylation was evident.Several aspects of the reproductive metabolism of normal and allatectomized adult Locusta were then compared. Production of yolk protein in the fat body was dependent on JH. It dit not regulate whether these proteins could be produced at all, but which proteins could be formed at a certain moment.This fundamental study was published at a time when practical application of insect hormones for pest control might become a reality. An increase in knowledge of the biochemical and physiological action of these hormones within the insect was essential

Biochemical aspects of juvenile hormone action in the adult Locusta migratoria

The present study deals with the actions of juvenile hormone in the adult African migratory locust (Locusta migratoria). Juvenile hormone (JH) was known to be essential for a completely normal yolk development in the oocytes of most female insects. No egg production was possible if the corpora allata (small spherical organs near the cerebral complex, which excrete JH) were extirpated. The general metabolism of such 'allatectomized' insects was strongly modified.To find whether JH directly influenced respiratory metabolism, experiments in vitro with mitochondria isolated from flight muscles and fat body were used. No relation existed between JH action and oxygen consumption in vitro. However, a positive effect of JH on oxidative phosphorylation was evident.Several aspects of the reproductive metabolism of normal and allatectomized adult Locusta were then compared. Production of yolk protein in the fat body was dependent on JH. It dit not regulate whether these proteins could be produced at all, but which proteins could be formed at a certain moment.This fundamental study was published at a time when practical application of insect hormones for pest control might become a reality. An increase in knowledge of the biochemical and physiological action of these hormones within the insect was essential

Wat betekent 'IOBC/WPRS' en wat steekt er achter?

Artikel over de structuur en het functioneren van de International Organisation for Biological Control of Noxious Animals and Plants (IOBC), opgericht in 197

Control of moth pests by mating disruption: Successes and constraints

Male moths generally find their mates by following the females' pheromone plume to its source. A formulated copy of this message is used to regulate mating of many important pests, including pink bollworm Pectinophora gossypiella, oriental fruit moth Grapholita molesta and tomato pinworm Keiferia lycopersicella. How synthetic disruptant interrupts normal orientation is uncertain, but the most probable mechanisms invoke adaptation and habituation, competition between point sources of formulation and females, and a camouflage of a female's pheromone plume by the formulation. The efficacy of this technology is related principally to the motility of mated females into the area to be managed, the initial population levels of the pest, and the release characteristics of the formulation. In most cases, implementation of this technology necessitates a sophisticated monitoring and management program. Area-wide management schemes are ideal vehicles for using disruptants. -from Author