<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343829</termId><termName>herbicide</termName><termType>PT</termType><termNote><![CDATA[ Any chemical agent that is toxic to some or all plants, particularly those categorized as weeds. Historically a variety of substances have been used including salts, carbon disulfide, borax, pyridine, mercurials, and arsenic trioxide. After 1945 synthetic varieties emerged including: amitrole, picloram, 2,4-D, DDT, atrazine, glyphosate, diquat, and paraquat. Herbicides do not always decompose and have created environmental hazards. ]]></termNote><termCreatedDate>2026-03-30 20:32:43</termCreatedDate><relation><relationType>UF</relationType><termId>31343830</termId><termName>herbicides</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319909</termId><termName>biocide</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31374022</termId><termName>weed killer</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31373669</termId><termName>sodium arsenite</termName><termType>PT</termType></relation></term>  </Zthes>