by Staff Writers
Washington DC (SPX) Mar 23, 2012
New research has linked springtime die-offs of honeybees critical for pollinating food crops - part of the mysterious malady called colony collapse disorder - with technology for planting corn coated with insecticides.
The study, published in ACS' journal Environmental Science and Technology, appears on the eve of spring planting seasons in some parts of Europe where farmers use the technology and widespread deaths of honeybees have occurred in the past.
In the study, Andrea Tapparo and colleagues explain that seeds coated with so-called neonicotinoid insecticides went into wide use in Europe in the late 1990s. The insecticides are among the most widely used in the world, popular because they kill insects by paralyzing nerves but have lower toxicity for other animals.
Almost immediately, beekeepers observed large die-offs of bees that seemed to coincide with mid-March to May corn planting. Scientists thought this might be due to particles of insecticide made airborne by the pneumatic drilling machines used for planting.
These machines forcefully suck seeds in and expel a burst of air containing high concentrations of particles of the insecticide coating. In an effort to make the pneumatic drilling method safer, the scientists tested different types of insecticide coatings and seeding methods.
They found, however, that all of the variations in seed coatings and planting methods killed honeybees that flew through the emission cloud of the seeding machine.
One machine modified with a deflector to send the insecticide-laced air downwards still caused the death of more than 200 bees foraging in the field.
The authors suggest that future work on this problem should focus on a way to prevent the seeds from fragmenting inside the pneumatic drilling machines.
American Chemical Society
Farming Today - Suppliers and Technology
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Fertilization by invasive species threatens nutrient-poor ecosystems
Bielefeld, Germany (SPX) Mar 21, 2012
They can estimate whether native plants in the neighbourhood of invasive species incorporate the nitrogen fixed by the latter. The biologists examined the Sydney Golden Wattle (Acacia longifolia), an Australian shrub that has established itself in Mediterranean climates worldwide. They found that the invasive species threatens native ecosystems not only through its prolific growth but also ... read more
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