Title: Pesticide resistance - Wikipedia
Headings: Pesticide resistance
Pesticide resistance
Contents
Causes
Examples
Consequences
Multiple and cross-resistance
Adaptation
Management
Integrated pest management
Status
Glyphosate
B. thuringiensis
See also
References
External links

Content: Pest species evolve pesticide resistance via natural selection: the most resistant specimens survive and pass on their acquired heritable changes traits to their offspring. Cases of resistance have been reported in all classes of pests ( i.e. crop diseases, weeds, rodents, etc. ), with 'crises' in insect control occurring early-on after the introduction of pesticide use in the 20th century. The Insecticide Resistance Action Committee (IRAC) definition of insecticide resistance is 'a heritable change in the sensitivity of a pest population that is reflected in the repeated failure of a product to achieve the expected level of control when used according to the label recommendation for that pest species'. Pesticide resistance is increasing. Farmers in the US lost 7% of their crops to pests in the 1940s; over the 1980s and 1990s, the loss was 13%, even though more pesticides were being used. Over 500 species of pests have evolved a resistance to a pesticide. Other sources estimate the number to be around 1,000 species since 1945.