All over the world a huge effort is being made to fight these pests and now new weapons have been added to man's armoury in this battle. These are radioactive isotopes and radiation sources. Their contribution to the control of agricultural pests is not yet precisely calculable, but several promising lines of attack have been opened up and some concrete r e sults already achieved. The main valu...

In migratory birds, traits such as orientation and distance are known to have a strong genetic background, and they often exhibit considerable within-population variation. How this variation relates to evolutionary responses to ongoing selection is unknown because the underlying mechanisms that translate environmental changes into population genetic changes are unclear. We show that within-popu...

Populations of migratory birds differ in their direction of migration with neighbouring populations often migrating in divergent directions separated by migratory divides. A total of 26% of 103 passerine bird species in Europe had migratory divides that were located disproportionately often along a longitudinal gradient in Central Europe, consistent with the assumption of a Quaternary glacial o...

ethiopia is remarkably rich in its biological, ecological and landscape diversity and is home to outstanding natural bio-resources such as a number of herbs, aromatic and medicinal plants. the present study was carried out to study the composition, distribution and economic importance of insect pests of prioritized aromatic (mentha sp., lemon verbena, fennel, rosemary, rosadamascene, oregano, p...

Migratory birds appear to have relatively smaller brain size compared to sedentary species. It has been hypothesized that initial differences in brain size underlying behavioural flexibility drove the evolution of migratory behaviour; birds with relatively large brains evolved sedentary habits and those with relatively small brains evolved migratory behaviour (migratory precursor hypothesis). A...

How seasonal migration originated and impacted diversification in birds remains largely unknown. Although migratory behaviour is likely to affect bird diversification, previous studies have not detected any effect. Here, we infer ancestral migratory behaviour and the effect of seasonal migration on speciation and extinction dynamics using a complete bird tree of life. Our analyses infer that se...

The desert locust Schistocerca gregagia (Forskål, 1775) is one of the most harmful migratory pests in world, posing a major threat to agricultural production, livelihoods, and food security. Climate, land use, topography influence distribution locusts, but few studies have integrated all factors on global scale explore suitable areas for locusts paths through which this species could potentiall...

Climate change is predicted to increase migration distances for many migratory species, but the physiological and temporal implications of longer migratory journeys have not been explored. Here, we combine information about species' flight range potential and migratory refuelling requirements to simulate the number of stopovers required and the duration of current migratory journeys for 77 bird...

RISKS TO THE ENVIRONMENT AND SOCIETY POSED BY RESISTANT PESTS Many general questions and observations were made concerning the risk of pests, especially insect pests to a crop containing a transgenic pesticide, e.g., the Bacillus thuringiensis (Bt) toxin. If pests cannot be controlled, food and fiber crops will be jeopardized and may negatively impact society throughout the world. As a result, ...

Abstract Background Spodoptera frugiperda (JE Smith), or fall armyworm, is one of major migratory agricultural pests with a wide range hosts. The effect different hosts (maize and kidney bean) on the growth reproduction S. were investigated using age-stage, two-sex life table method. Results results showed that could complete its entire cycle both hosts, albeit significantly development reprodu...