Effect of synthetic pyrethroids on the pests of paddy

Abstract

The relative efficacy of four synthetic pyrethroide against the important rice pests was assessed through a field experiment laid out at the Model Agronomic Research Station karamana, during 1981, taking carbaryl as standard. Against the rice gall midge Pachydiplosis oryzae cypermethrin (50 and 25 g ai/ha) and permethrin (50 g ai/ha) were found superior, The low variation in tho percentage incidence of silver shoots in plots treated with pyrothroids and carbaryl showed that the use of the former category of pesticides is not justified due to the high, cost involved.