Abstract

Author:
Md. Jahir Uddin Majumdar, M. M. Rahman, M. S. Hossain, Md. Emam Hossain

Doi: 10.26480/sfna.02.2022.77.80

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

The experiment was conducted at the apiary of Sher-e-Bangla Agricultural University (SAU), Dhaka during the period from January to June 2019 to study the efficacy of some promising biopesticides in comparison to conventional chemical pesticides against insect pests of gladiolus. With four replications, the experiment was set up in a Randomized Complete Block Design (RCBD). The treatments were: (T1) Neem oil @ 3ml/L water, (T2) Neem oil @ 3ml/L water + Trichogramma evanescense @ 0.5 gm/ 6 m2, (T3) Neem seed kernel @ 200 gm/L water, (T4) Neem seed kernel @ 200 gm/L water + Trichogramma evanescense @ 0.5 gm/ 6 m2, (T5) Ripcord 10 EC @ 2.0 ml/L water, (T6) Radial 20 EC @ 3.0 ml/L water and (T7) Untreated. The highest number of plants (54.66) obtained from T1 (Neem oil @ 3ml/L water). The highest number of pest population derived from (T7) Untreated control and the second highest pest population was found from T6 (Radial 20 EC @3.0 ml/L water. The lowest pest population derived from T4 (Neem seed kernel @ 200 gm/L water + Trichogramma evanescense @ 0.5 gm/ 6 m2) at early, mid and late stage of gladiolus respectively. The best outcomes have been obtained from T4 (Neem seed kernel @ 200 gm/L water + Trichogramma evanescense @ 0.5 gm/6 m2) and lowest outcome came from untreated control.