Insecticidal Effects of Some Bacillus thuringiensis Commercial Biopreparats on the Larvae of the Tomato Leaf Miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae)

Year 2022, Volume: 6 Issue: 4, 632 - 636, 30.12.2022

Alime Bayındır Erol Oktay Erdoğan

https://doi.org/10.31015/jaefs.2022.4.17

Abstract

Effects of 5 commercial biopreparats named; Dacron®, Florbac®, Dipel®, Delfin® and Rebound® containing different Bacillus thuringiensis (Bt) strains on the 3rd instar larvae of the tomato leaf miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) were determined under laboratory conditions. T. absoluta, tomato (Gusto F1) variety and some commercial biopreparats were used as materials in the study. Production of T. absoluta larvae were performed under the conditions of the growth chambers where the tomato variety was grown (25±1°C, 60±5% RH and 16:8 photoperiod). Under laboratory conditions, 1, 3 and 5% concentrations of commercial biopreparats were applied on the 3rd instar larvae of the pest, and the experiment was carried out with 5 replications according to a randomized parcels design. As a result of the application of 1% IU/mg concentrations of Dacron® and Delfin® commercial biopreparats, 100% mortality rate was determined in the 3rd instar larvae of T. absoluta on the 7th day counts. When 3 and 5% IU/mg concentrations of all commercial biopreparats were applied, a mortality rate of 100% was recorded on the 3rd instar larvae of T. absoluta on the 5th and 7th day counts. In-vitro, as the concentration of commercial biopreparats increased, mortality rate of the 3rd instar larvae of T. absoluta increased. However, it would be appropriate to conduct field trials with the same commercial biopreparats to recommend their use of them commercially.

Keywords

Bacillus thuringiensis, Tuta absoluta, Mortality rate, Biopesticide

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