Scientific name

 : Parthenium hysterophorus L.

Common name

:

Gajarghas, Chatakchandani, Congress grass, Carrot weed

Origin

 :

Central and N. America, Invaded large area of India

Introduction

:

 Commercial trade from USA, believed to have come with Mexican wheat consignment (1950) under PL 480 Scheme

Likely pathways of spread

:

Wind, water run off, transport of gains and vegetables, garden waste etc

Vectors

:

Through air, man, animals, cattle and nurseries

Distribution patterns

:

Agricultural fields, forest areas, grasslands and urban areas, it is an aggressive colonizer of degraded areas with poor ground cover and exposed soil such as fallow wastelands, roadsides and overgrazed pastures between existing plant cover and weed flora.

Threat level

:

National, Regional
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