2020 Vol.26 No.1 PP 65-68
https://doi.org/10.33451/florafauna.v26i1pp65-68
Carbamate, Organophosphate and Organochlorine Pesticidal Effect on the Qualitative Occurrence and Survivability of Blue-green Algae
Ganesh S. Shinde
Department of Botany,
K.J. Somaiya College of Arts, Commerce and Science,
KOPARGAON, Dist. AHMEDNAGAR-423 601 (M.S.), INDIA
*Corresponding Author :
Email : gsshindebhumi@gmail.com
ABSTRACT
Blue-green algae make a valuable contribution to the nitrogenous soil fertility by fixing atmospheric nitrogen and are of
great agricultural importance as biofertilizer. Four commercial grade pesticides, Carbamate, Furadan and Sevin and
Organophosphate, Rogor and Organochlorine, Endotaf were used to study their effect on the survivability and qualitative
occurrence of blue-green algae by taking survival on the control plate as 100%. Stock solutions of these pesticides were
prepared freshly for experiments in the sterilized BG-11 media and added to the culture media to obtain the desired
concentrations of 100, 250, 500 and 1000 ppm. After 30 days of incubation, the blue-green algal forms appeared in the culture
flask were identified using standard monographs. The pragmatic results indicated that, soil blue-green algae show variable
resistance to pesticide treatments. The survival percentage of the tested blue-green algae was reduced upto 50 percent at
500 ppm of carbamate pesticides, Furadan and Sevin. While with Rogor only 10.52% and Endotaf 5.26% survivability was noticed
at 500 ppm dose level. Furthermore, the organochlorine pesticide Endotaf was more toxic than the organophosphate, Rogor and
the carbamates, Sevin and Furadan in sequence to the blue-green algae. It was cocluded that higher doses of pesticide
application in the crop fields i.e. more than 100 ppm of Furadan, Sevin and Rogor and even at 100 ppm of Endotaf,
qualitative and quantitative occurrence of heterocystous and non- heterocystous blue-green algae was decreased considerably.
This suggests that, indiscriminate use of these pesticides may cause adverse effects on the nitrogen fixing blue-green
algae of various crop fields, which has a direct influence on total productivity. In general, the sensitiveness of different
blue-green algae to pesticide application was found to be more in sheathless heterocystous and unicellular forms than
the heterocystous ensheathed and non- heterocystous ensheathed forms.
Key words : Blue-green algae, Endotaf Pesticides, Furadan, Qualitative Occurrence, Rogor, Sevin.