R. Parimala Devi and P. Marimuthu
An ecofriendly botanical formulation "Polymin 40 EC" was developed from the chloroform extract of P. minus. The effect of various concentrations of P-40 on seed infection, germination and vigour of tomato and 2 per cent P-40 was found to increase the germination and vigour but reduced the seed infection to a significant extent. Two percent P-40 was found to be the optimum concentration for plant disease control (tomato - Alternaria solani) under pot culture conditions. Application of P-40 increased the activity of peroxidase (PO), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL) and phenol content of the crop plants.