Published Paper Details:

Sumicidin, the fungicide cum insecticide showed significant difference in action at different concentrations on a blue-green alga, is well evident from the tables and figures described in the result chapter. At higher concentration of the fungicide and higher exposure period, drastic effects on the blue-green alga were observed. At the highest concentration (Conc. Z) of the toxicant, the alga showed typical toxic symptoms, beyond which survival of the alga becomes extremely difficult and at times impossible under laboratory control conditions. The analysis of variance ratio tests and correlation coefficient analysis carried out for all parameters studied indicated clearly that the fungicide cum insecticide, Sumicidin is extremely toxic to blue-green alga. In the present investigation, a graded series of concentrations of the fungicide, Sumicidin was prepared to evaluate the toxic effects of the Sumicidin on the blue-green alga. With the increase in the concentration of the toxicant the percent survival decreased and hundred percent death was noticed at 1.87 mg.l-1 of Sumicidin with in a period of 15 days. The maximum allowable concentration (MAC) recorded for this alga for 15 days exposure was 0.31ml l-1. The optical density study and the dry weight analysis indicated that the toxicant Sumicidin is deadly toxic. Sumicidin did not show any dichotomous behavior. Complete bleaching of the algal mass inside the test solution was observed. At higher concentration of the fungicide and at higher exposure period, bleaching of the filaments and total chlorosis of the filaments were observed. The exposed alga could not recover in recovery studies, even after prolonged recovery period. This indicated that the toxicant, Sumicidin caused permanent damage to the exposed algal system. Hence, it can be safely concluded that the damage caused in exposed system was only due to the toxicant. The present work was designed to study the effects of the fungicide, Sumicidin, on growth of the blue-green alga, Anabaena cylindrica, Lemm.