Volume 7, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Field trials are demonstrating the valuable suppressive effect of interspecific competition by on , the snail intermediate host of Puerto Rican schistosomiasis. colonies were established easily in ten of sixteen farm ponds planted manually with the snail. Eight of the ten ponds originally contained . By about 2 years after planting, had disappeared from all eight of the ponds, in an average time of 8 months. Widespread planting of in one endemic watershed has practically eliminated the schistosome host there in less than 2 years. is now being used as an adjunct to other types of control by the insular government.

Among other snails under study shows definite promise of useful competition in irrigation tanks. appears to be effectively crowding in some areas, while sp. has been ineffective.

Other than snails, there apparently are few natural enemies of in Puerto Rico.


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