Polarized Light Microscopy Digital Image Gallery

DCPA (Dimethyl Tetrachloroterephthalate)

Also commonly known as chlorthal or chlorthal-dimethyl, DCPA has little effect on mature weeds or crops, but is instead effective at controlling plants that are in their seed and pre-emergence stages. The mechanism of action of DCPA is antagonism of auxin, a plant growth hormone that affects cell elongation, root formation, and bud development. The pesticide may be purchased in several different forms and is often sold under the trade names Dacthal and Dacthalor. Considered a class IV toxin by the Environmental Protection Agency (EPA), DCPA poses little health hazard to those who utilize the compound or accidentally come into contact with it. Indeed the greatest hazard in use of DCPA, which is not teratogenic, mutagenic, or carcinogenic, is often considered the possible presence of more dangerous impurities, such as dioxin or hexachlorobenzene, in preparations of the pesticide.

© 1995-2019 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Wednesday, Jan 21, 2004 at 09:07 AM
Access Count Since January 23, 2004: 6663
Microscopes and digital imaging equipment provided by:
Visit the Olympus Microscopy Resource Center website. Visit the QImaging website.