Effect of combined treatment of methomyl and lindane on the activities of auxins and gibberellins in Zea mays plants

Treating maize plants at two different growth stages [1 = 45 days and 2 = 60 days] with either methomyl or methomyl followed by lindane led to reduction in the percentage and activity of auxins and gibberellins. The degree of reduction was found to depend on the growth stage as well as the type of insecticide treatment. On the other hand, the growth inhibitors showed a reverse trend, thus increasing in percentage and activity with the plant age and the application of more than one insecticide. The reduction of the promoting zones following the application of insecticide[s] is probably due to an inhibitory effect on the activity of IAA-oxidase system which results in an increase in the phenolic compounds. The inhibitory effect of insecticide[s] on gibberellins might be due to the inhibition of their precursors

toxicity of the insecticide propetamphos in mice

The toxicity of the organophosphorus insecticide propetampos-labelled with C[14] [PTP] was studied in swiss mice. The toxicological studies carried out included the effect of [PTP] on three enzymes namely: Choilnesterase SGOT and SGPT. The three doses were 4,8,12 mg/kg used. Samples of RBC and brain, tissue were taken at different time intervals, following intraperitonial [ip] injection of the insecticide. Effect on plasma enzymes was noticed with the highest dose [12 mg/kg], while in RBC an inhibition of the cholinesterase activity was found to increase with increase of dose reaching its maximum the highest dose. On brain cholinesterase the three doses showed a continuous increase in the relative inhibition with the increase of time reaching its maximum value after 48 h. The effect of the three different doses of [PTP] on SGOT and SGPT activities, at different time intervals, was recorded at 24 h intervals, using 8 and 12 mg/kg [PTP] concentration, insignificant effect when applying 4 mg/kg PTP doses