Toxicity of chlorophyllin in different wavelengths of visible light against Fasciola gigantica larvae

Abstract

Toxicity of chlorophyllin against redia and cercaria larvae of Fasciola gigantica was studied under irradiation of visible light. Highest and lowest toxicity of chlorophyllin against both larvae was noted under red (redia – 8h LC50 7.88mg/10mL and cercaria – 11.99mg/10mL) and green (redia – 8h LC50 32.12mg/10mL and cercaria – 8h LC50 43.80mg/10mL) light irradiation respectively. The highest toxicity of chlorophyllin under red light irradiation against redia (8h LC50 7.88mg/10mL)/cercaria (8h LC50 11.99mg/10mL) was followed by white (8h LC50 redia – 20.48mg/10mL, 8h LC50 cercaria – 18.03mg/10mL), blue (8h LC50 redia – 33.10mg/10mL/ 8h LC50 cercaria – 19.98mg/10mL) and yellow (8h LC50 redia – 23.87mg/10mL/ 8h LC50 cercaria – 23.48mg/10mL). Chlorophyllin treatment in darkness (control I) and without treatment of chlorophyllin, while all other conditions were same as treatment group (control II) caused no mortality of redia/cercaria larva. Chlorophyllin might be a promising new safe strategy to replace synthetic larvicide in fasciolosis control programme.