Water Hyacinth: a weed menace and ways to control

摘要

The research identified small, medium and large growth stages of water hyacinth during the field survey based on various parameters like plant height, petiole length, leaf area and biomass. Among the different inoculation loads of the insect biocontrol agents 3 insects/plant and 6 insects/plant was adequate for controlling the I (small) and II (medium) stage of the weed respectively. Among the different herbicides used Imazapyr 0.50 kg/ha was found to excel in controlling water hyacinth but the water quality and fish growth was shown to be impaired. Among the different plant species screened for their allelopathic potential on water hyacinth Coleus amboinicus was found to effect 100 percent kill within 24 hr after treatment.