Effects of Synthetic Insecticides and Crude Botanicals Extracts on Cabbage aphid, Brevicoryne brassicae (L.) (Hemiptera: Aphididae) on Cabbage

Tadele Shiberu,Mulugeta Negeri

doi:10.4172/2471-2728.1000162

Abstract

The study was conducted to evaluate the insecticidal action of two new chemical insecticides and three locally available botanicals. These materials were evaluated for their efficacy against cabbage aphids, Brevicoryne brassicae (L.), under laboratory and field conditions. The laboratory result revealed that Lambda Cyhalothrin (Triger 5 E.CTM) and Emamectin benzoate (Cutter 112 E.CTM) were non-significant difference from the standard check within 1 day after application. The field results showed between the new insecticides, Triger 5 E.CTM and Cutter 112 E.CTM were non-significant difference from that of the standard check (Diazinon 60% E.CTM) at both locations (Guder and Mutulu) within three days after application. Extracts of neem (Azadirachta indica) seed, Hop bush (Dodonae angustifolia) fresh leaf and Lemon grass (Cymbopogon citrates) gave positive performance under laboratory while the efficacy percent were decline at both field locations on field. Azadirachta indica seed, Dodonae angustifolia and Cymbopogon citrates were given 59.48, 57.16 and 52.50 at Mutulu and 53.92, 37.26 and 62.72 at Guder location mortality percent, respectively, after 3rd day observation in first spray. The obtained results revealed that all tested materials were exhibited mortality rate action against cabbage aphids. Powdered neem seed, Dodonae angustifolia fresh leaf and leaves of Cymbopogon citrates caused moderately mortality percent against cabbage aphid within 3 days after applications. Higher damage and low yield were observed in control and botanicals application. This study indicated that the two insecticides Cutter 112 E.CTM and Triger 5 E.CTM and botanicals could be recommended as an alternative management option of Brevicoryne brassicae (L.) in Ethiopia.

Highlights

Cabbage (Brassica oleracea L. var. capitata) is cultivated in about 31,783.54 ha [1]
Cabbage yield and quality has been shown to be influenced by several factors, among of these factors cabbage aphids are very serious in cabbage growing areas of Ethiopia especially in dry season
This plant commonly found in West shawa of Ethiopia, the branches used for teeth brush because of its interesting aroma and the leaves used for cultural medicinal value

Summary

Introduction

Cabbage (Brassica oleracea L. var. capitata) is cultivated in about 31,783.54 ha [1]. Colonies of aphids are found on upper and lower leaf surfaces, in leaf folds, along the leafstalk, and near leaf axils It secretes honey dew while feeding on leaves that reduces the quality of cabbage. Use of alternatives including botanicals, biopesticides and new generation synthetic insecticides is essential to grow health crops of cabbage. Plant product pesticides can be undertaken into practical applications in natural crop protection, which can help the small-scale farmers [13]. Commonly known as hop bush, called “Etecha” in afan oromo and “Kitkita” in Amharic is a perennial shrub belonging to Sapindaceae family This plant commonly found in West shawa of Ethiopia, the branches used for teeth brush because of its interesting aroma and the leaves used for cultural medicinal value

Methods

Findings

Discussion

Conclusion