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Practical Applications of Herbicide Physiology: Introduction for Practical Applications of Herbicide Physiology Alex R. Martin Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA Deana M. Namuth Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA 2005 Lesson Navigation Tips: - Click on 'Animations' button found to the left in order to view the animation which supplements this lesson. You can also click on the animation icon within the text. - Click on the figures to see enlarged versions. - Click on words in color to bring up their definition. Overview: This lesson will examine the basic requirements for herbicide performance. This lesson will examine how herbicide and plant characteristics interact as a basis for explaining herbicide performance. The application requirements of both soil and foliar active herbicides will be examined in relation to their characteristics. The influence of environmental conditions on herbicide performance, both weed control and crop injury, will be examined. Objectives: 1. Understand the influence of herbicide site of absorption and translocation characteristics on herbicide performance. 2. Explain the effects of temperature and moisture on herbicide activity. 3. Understand the mechanisms giving rise to herbicide selectivity. 4. Understand the influence of weed seedling density on herbicide effectiveness. 5. Explain the effect of weed size and age on sensitivity to herbicides. Development of this lesson was supported in part by the Cooperative State Research, Education, & Extension Service, U.S. Dept of Agriculture under Agreement Number 00-34416-10368 administered by Cornell University and the American Distance Education Consortium (ADEC). Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. This lesson has been assigned University of Nebraska-Lincoln Cooperative Extension Journal Series Number 1021.