پديد آورندگان :
Ayyappan S. نويسنده , Chattopadhyay A. نويسنده , Adhikari S. نويسنده , Adhikary S. P. نويسنده
چكيده لاتين :
In this investigation, the efficacy of the herbicide butachlor, (N-butoxymethyl-2 chloro-2^1, 6^1 diethyl
acetanilide) was tested against few common submerged macrophytes namely Hydrjlla (Hydrilla
verticiltata (L.) Royale). Najas (Najas minor All.), Nechamandra (Ncchamandra alternlfolia (Roxb.)
Thwaitcs) and Ottelia (Ottetia alismoides (L.) Pers.) of freshwater fish ponds. Almost complete decay
of Hydrilla, Nechamandra and Ottelia was achieved at 7.5 L of active ingredient/ha/m butachlor within
15 days while the herbicide showed no negative effect on Najas, However at the same concentration of
butachlor, total mortality of zooplankton and water fern Azolla (Azolla caroliniana Lamarck) OCCUlTed
within seven days. In case of few freshwater fish species like Rohu (Lahro rohita}, Channa (Channa
punctatus). Anabas (Anabas testitudineus) and lleteropneustcs (Heteropneustes fossilis), total mortality
occurred upto 90 days after application of the same dose of butachlor but fish survived beyond 120
days of herbicide application indicating degradation of the herbicides.
