Data collected from bi-monthly sampling of arthropods found in lagundi showed that the most common species attacking the plants are thrips, leafhoppers and dipterans.Pesticide bioefficiency trials on seven (7) insecticide and three (3) fungicide formulations were evaluated after 6 sprayings at bi-weekly interval. Results showed that after the first 3 sprayings cypermethrin, carbaryl and deltamethrin treated plots showed lowest number of insects collected compared to control plots. For the last 3 sprayings, fenvalerate, cypermethrin, carbaryl and dimethoate showed reduction in insect counts at 3 days after spraying. Results also indicate that bi-weekly spraying interval is too long because insect counts increase by day 7. Fungicide efficacy evaluation showed that all three were equally effective in reducing disease incidence.Among the insecticides used for lagundi, monocrotophos and cypermethrin were found to be most effective as they gave the lowest number of insects collected compared to control plots. Among the fungicides used in lagundi, mancozeb significantly reduced incidence of plant disease.
The study aims to develop sound crop protection practices as a component of pest management schemes and herbal production; monitor pesticides residues and determine the effect of processing on pesticide residue.