SCIE 1P50 Lecture Notes - Lecture 8: Bacillus Thuringiensis, Beetle, Lepidoptera
29 Oct 2016
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Document Summary
Toxins have specific activities against insect species of moths and butterflies (lepidoptera), flies and mosquitoes and hymenoptera (wasps), coleoptera (beetles), and nematodes. Anything that is going to compete with crops nutrients and life. Glyphosate - broad spectrum (roundup): kill a lot of different types of means. Soybean, canola, cotton, maize, sugar beet, alfalfa. Planting refuges of non-bt crops near bt crops in the field is the primary strategy of delaying insect resistance. Pyramid stacking - using other bt toxins. The genes which produce the enzyme that causes the browning are switched off - silenced. Us - potato reduced browning when cut and less visible bruising. Escaping transgenes could pollute ecosystems and damage non-target organisms. Could ruin the integrity of native ancestral species. Gm crops pose no ill health effects. They benefit the environment by using less amounts of insecticides. Gm crops reduce carbon emissions by needing fewer fuel-burning tractors and sequestering carbon in the soil by no-till farming.
