Alligator weed, Alternanthera philoxeroides (Martius) Grisebach of family Amaranthaceae, is a native of south America but has spread to 30 countries in the world. At present, the weed has spread to many states of India and has become a problematic weed in aquatic body, ditches, canals and vacant low land areas in residential colonies. Survey revealed the occurrence of alligator weed in Madhya Pradesh, Maharasthra, Assam, Meghalaya, Arunachal Pradesh, Bihar, Haryana, Himachal Pradesh, Karnataka, Kerala, Orissa, Tamil Nadu, Uttarakhand, Uttar Pradesh and West Bengal. The infestation of alligator weed varied pond-to-pond ranging from 0.0 to 91.40% in Jabalpur, Satna and Rewa cities of Madhya Pradesh. Out of 27 ponds surveyed in Jabalpur, alligator weed was not found in six ponds. In four ponds infestation ranged between 1 to 25% while 25 to 50% infestation occurred in 8 ponds. In 9 ponds, more than 50 per cent infestation was found. Out of four ponds in Rewa city of Madhya Pradesh, the weed was found in one pond infesting about 45% area of the pond. Weed infestation was severe in two out of three ponds in Satna. These figures clearly indicate the severity of the weed problem in Jabalpur in Particular and in India in general.