Abstract
An experiment was conducted on the bio-efficacy of certain herbicides for controlling water hyacinth (Eichhornia crassipes) and its impact of herbicides on fish mortality. Three herbicides (Fernoxone @ 1.50 kg ha-1, Glycel or Round up @ 2.50 kg ha-1 and Gramoxone @ 1.50 kg ha-1) were tried, all are foliage applied herbicides. Three different fishes were tested such as common carp, mrigal and rohu. Among the herbicides applied, round up caused maximum reduction of plant height of 0.50, 1.00 and 1.00 cm; 2.75, 6.98 and 10.00g of biomass were obtained at 50 DAS on small, medium and large statures of E. crassipes. The cent percent chlorophyll content was recorded compared to control treatment at 28 DAS, whereas it cent percent mortality of E. crassipes at 35 DAS on small, medium and large statures of the weed. Similarly the same herbicides caused the least mortality percent of fishes 23.30, 16.60 and 20.00 on common carp, mrigal and rohu at 32 DAS, respectively compared to other herbicide treatments.
Highlights
Based on the above facts, a pot culture experiment was conducted on bio-efficacy of chemical control as an effective and quick methods are as follow
44’ E Longitude, and an altitude of +5.79 MSL to study the bio-efficacy of certain herbicides for the control of water hyacinth
In all the three treatments, of which fernoxone caused highest mortality per cent of 42.70, 35.26 and 30.00 of common carp, mrigal and rohu fishes on 32 DAS followed by gramoxone
Summary
Water hyacinth belongs to the family pontederiaceae and is a native of tropical South America [2]. Aquatic weeds are those unwanted plants, growing in water and complete at least a part of their life cycle in water [3].Water hyacinth is an erect, free-floating and one of the most troublesome weeds all over the world and is most devastating aquatic weeds in India [4]. The adopted control methods available on mechanical, chemical and biological methods. Herbicides used today have much more environmentally acceptable properties. They are characteristically biodegradable or become biologically inactive [12]. Based on the above facts, a pot culture experiment was conducted on bio-efficacy of chemical control as an effective and quick methods are as follow
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