Evaluation of effective dose of monocrotophos for the control of mango hopper Amritodus atkinsoni Lethierry (Cicadellidae: Homoptera) by injection method and its comparison with foliar application.
Shah A. H., Jhala R. C., Patel G. M., Patel S. H.
Author Affiliation: Department of Entomology, N.M. College of Agriculture, Gujarat Agricultural University, Navsari, India.
Gujarat Agricultural University Research Journal 9 : 14-18
Abstract : A field trial was carried out in Gujarat, India, in February-March 1981 to determine the effectiveness of monocrotophos (Nuvacron) applied to mango as a stem injection at 3 dosages (0.15, 0.25 and 0.30 ml a.i./cm girth) for the control of Amritodus atkinsoni (Leth.) in comparison with a foliar spray containing 0.04% of the compound. The treatments were applied after flowering. The stem injections at 0.25 and 0.30 ml a.i./cm girth and the foliar spray reduced the pest population significantly 1 week after application and remained effective for up to 1 month, when the effectiveness of the foliar spray decreased. Stem injection at 0.15 ml a.i./cm girth was effective only for 3 weeks. The lowest effective dosage of monocrotophos for controlling the pest for more than 5 weeks was 0.25 ml a.i./cm girth.