During September 1999, surveys to quantify plant infestations and insect biological control agents of both Eichhornia crassipes and Hydrilla verticillata were initiated on the Rio Grande from just west of McAllen, TX, and east to Brownsville, TX. Waterhyacinth biomass/cu m differed significantly from site to site and ranged from 3 kg/cu m to about 21 kg/cu m. Both Neochetina eichhorniae and N. bruchi were commonly collected ...
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