Slowing insect resistance to genetically modified crops
Genetically modified Bt crops are now widely used in the USA.
These crops contain genes from bacteria that make them toxic to some insect pests. A central concern in regulating these genetically modified crops is the risk of insects evolving resistance to the Bt toxins.
To reduce this risk, the “high dose/refuge” strategy is now being used, in which non-Bt fields (refuges for insect pests) are planted near Bt fields (where there is high dose of toxin).
In the November issue of Ecology Letters, Ives and Andow use mathematical theory to explain how the high dose/refuge strategy works. This analysis leads to several unexpected results. For example, for some Bt crops and some pests, spraying insecticides in refuges should not severely compromise the value of refuges.
This makes the high dose/refuge strategy more practical by allowing farmers to protect their crops in refuges. The new theory could lead to new resistance management strategies.
All news from this category: Agricultural and Forestry Science
Researchers confront optics and data-transfer challenges with 3D-printed lens
Researchers have developed new 3D-printed microlenses with adjustable refractive indices – a property that gives them highly specialized light-focusing abilities. This advancement is poised to improve imaging, computing and communications…
Research leads to better modeling of hypersonic flow
Hypersonic flight is conventionally referred to as the ability to fly at speeds significantly faster than the speed of sound and presents an extraordinary set of technical challenges. As an…
Researchers create ingredients to produce food by 3D printing
Food engineers in Brazil and France developed gels based on modified starch for use as “ink” to make foods and novel materials by additive manufacturing. It is already possible to…