Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) is a selective herbicide used for control of broadleaf weeds, especially thistles and clovers. Clopyralid is in the picolinic acid family of herbicides, which also includes aminopyralid, picloram, triclopyr, and several less common herbicides. For control of Creeping Thistle, Cirsium arvense, a noxious, perennial weed, clopyralid is one of the few effective herbicides available. It is particularly damaging to peas, tomatoes and sunflowers and can render potatoes, lettuce and spinach inedible. It does not affect members of the family Poaceae (grasses).; Clopyralid is known for its ability to persist in dead plants and compost, and has accumulated to phytotoxic levels in finished compost in a few highly publicized cases. This first came to light in Washington State when, during 2000 and 2001, residues of clopyralid were detected in commercial compost, and compost made at a municipal site damaged tomatoes and other garden plants planted in it. Word quickly spread to other local and state governments and in 2002, DowAgro, the manufacturer of clopyralid, voluntarily deregistered it for use on domestic lawns in the US and it is banned in several US states but it is found in consumer products in Europe such as Scotts Verdone Extra and Vitax Lawn Clear 2.

CAS：1702-17-6
中文别名：毕克草;3,6-二氯吡啶羧酸;3,6-二氯-2-吡啶甲酸;3,6-二氯-2-吡啶羧酸;
英文别名：3,6-DCP;3,6-Dichloropicolinic Acid;benzalox;shield;3,6-dichloro-2-pyridinecarboxylic acid;3,6-dichloropicolinic acid;format;Clopyralid;reclaim;3,6-Dichloro-pyridine-2-carboxylic acid;cirtoxin;3,6-dichloropyridine-2-carboxylic acid;3,6-Dichloropyridine-2-carboxylic Acid;cyronal;3,6-Dichloro-2-pyridinecarboxylic acid;lontrel;LONCID;campaign;
分子式：C6H3Cl2NO2
分子量：192.0
精确质量：190.954
Psa：50.19
Logp：2.0866

BRN号：473755
EINECS号：216-935-4
RTECS号：TJ7550700

外观与性状：白色或淡黄色粉末或晶体
密度：1.612 g/cm3
沸点：0°C
熔点：151-152°C
闪点：0°C
折射率：1.59
水溶解性：1.0 g/L
储存条件：0-6ºC
蒸汽压：0.000599mmHg at 25°C

RTECS号：TJ7550700
安全说明：S26-S30-S61-S39
危险类别码：R41; R51/53
危险品运输编码：UN 3077
海关编码：2933399028
危险类别：9
包装等级：III
危险品标志：Xi

用途
用于防治油菜田的阔叶杂草