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Pesticide resistance is the ability of a pest population, such as insects, fungi, weeds or rodents, to evolve a tolerance to a pesticide that it was previously susceptible to. Retrieved from http://en.wikipedia.org/wiki/Pesticide_...
Pre-emergent herbicides kill weeds as they germinate from their seeds. To be effective, pre-emergent herbicides are applied directly to the soil and spread with a light application of water. The herbicide makes a barrier of poison that reduces the chance of weed germination, says the University of Illinois.erbicides that require contact are sprayed onto the plant and absorbed through the waxy layer of the leaf. Contact herbicides will kill only the area they touch and do not kill the weed roots, meaning the weed may grow back, says the University of Illinois Extension.