Abstract
The molluscicidal effects of herbicide 2, 4-D were studied against tow species of freshwater snail Bulinus truncatus and Melanopsis nodosa by short term experiments. Calculated values of lethal concentrations (LC50 and LC100) were maid to two spices for different period of time 24hr, 48hr, 72hr and 96hr. The study had showed that the herbicide 2, 4-D was toxic against the tow species. The toxicity of the herbicide was low or unknown in low concentrations in the first period of exposure 24and 48hr to two spices but it increase gradually with increase period of exposure. The spice of B.truncatus was more tolerant than the M.nodosa. All the individual of M nodosa was death while in B.truncatus the complete death was not appear until finish the period of exposure 96hr.
Highlights
The molluscicidal effects of herbicide 2, 4-D were studied against tow species of freshwater snail Bulinus truncatus and Melanopsis nodosa by short term experiments
From the probit values found that the LC50 values against M.nodosa are calculated as 0.3 ml/l in 24hour,0.2 ml/l in 48 hour,0.1 in 72 hour,and 0.1 in 96 hour respectively
The LC50 values against B.truncatus are calculated as 0.5 ml/l in 4 hour,0.1 in 72 hour,and 0.1 in 96 hour respectively (Table 3)
Summary
2, 4-D (Dichlorophenoxy acetic acid) is used in many commercial products. A few commercial names for products containing 2, 4-D includes Weed trine-II, Aqua-Kleen, Barrage, Plantgard, Lawn-Keep, Planotox and Malerbane [1]. 2, 4-D, a chlorinated phenoxy compound, functions as a systemic herbicide and is used to control many types of broadleaf weeds. This study will refer to the acid form of 2, 4-D. This compound is used in cultivated agriculture and in pasture and rangeland applications, forest management, home and garden situations and for the control of aquatic vegetation. Most of the problems associated with the use of Agent Orange were associated with a contaminant (dioxin) in the 2, 4, 5-T component of the defoliant. The 2, 4-D acid forms, the oil-soluble amine salt and low-volatile ester do not dissolve well in water. 2, 4-D has only limited potential to contaminate ground-water. Most reported 2; 4D ground-water contamination has been associated with spills or other large sources of 2, 4-D release [4]. The data obtained from the above studies were subjected to probit analysis [13] to calculate LC50 and LC100 values
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