Abstract: Effects of systemic fungicide (topsin-M) and insecticide (dimecron) on absorption spectra, chlorophyll and total phenolic content of Vigna radiata were examined. Results revealed significant (P<0.001) deviation on absorption spectra of both chlorophyll a and b. However, dimecron had greater effects as compared to control. Chlorophyll and phenolic contents were stimulated by the application of systemic fungicide and insecticide. Use of pesticides such as topsin-M and dimecron showed some harmful effects on plant at higher concentration.