Efficacy of Bacillus thuringiensis var. aizawai and NeemAzal-T/S against the old world bollworm Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)
1 Department of Crop Protection, Faculty of Agriculture, University of Khartoum, Shambat, Sudan.
2 Department of Plant Protection, College of Agricultural Studies, Sudan University of Science and Technology (SUST), Shambat.
Research Article
International Journal of Frontiers in Biology and Pharmacy Research, 2021, 01(01), 007–012.
Article DOI: 10.53294/ijfbpr.2021.1.1.0002
Publication history:
Received on 19 February 2021; revised on 24 March 2021; accepted on 27 March 2021
Abstract:
The efficacy of XenTari® containing Bacillus thuringiensis var. aizawai (Bta), NeemAzal -T/S® (Azadirachtin A) and their combination were tested against the second and fourth larval instars of the old world bollworm (OWB), Helicoverpa armigera (Hübner). The Bta was applied in three concentrations of 0.5, 1, and 1.5 kg/ha while NeemAzal concentrations were 1, 2, and 3L/ha. The results showed a significant difference in the mortality percentage between the different concentrations. The Bta was more effective in the fourth larval instars. Seven days, after treatment, the mortality percentage in both second and fourth instar larvae reached 97% at concentration of 1 ml/l water. At the concentration of 2.7 g/l water, the mortality percentage caused by Bta in both second and fourth instar larvae increased gradually until the sixth day, where it reached 90% and 93%, respectively. On the other hand, the efficacy of NeemAzal-T/S® on the second and fourth instar larvae reached 97% seven days after treatment when applied at concentration of 1 ml/l water. The combination of XenTari® and NeemAzal-T/S® resulted in 100% mortality in the second instar larvae compared with respective mortality of 70% and 83%, when either of the two biopesticides was applied alone.
Keywords:
Helicoverpa Armigera; Biopesticides; Azadirachtin; Bacillus thuringiensis
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