| Effect of biopesticides Bacillus thuringiensis var. kurstaki, Se Nucleopolyhedrovirus, Spinosad and Emamectin on Spodoptera exigua Hübner in laboratory and field conditions |
| Paper ID : 1153-3IICE (R1) |
| Authors: |
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Mahsa Abdollahzadeh Bavani *1, Shahram Aramideh2, Abbas Hosseinzadeh3 1Department of entomology, faculty of plant protection, urmia university of iran 2. Assistant Professor of Plant Protection Department, Agriculture Faculty, Urmia University, Iran 3Assistant Professor, Department of Plant Protection, Mahabad Branch, Islamic Azad University, Mahabad, Iran |
| Abstract: |
| Sugar beet (Beta vulgaris L.) is one of the main and strategic industrial crops, which has a major share in sugar production in the world. Beet armyworm (Spodoptera exigua Hübner) is one of the most important pests of sugar beet. Due to the problems associated with the use of chemical pesticides against this pest, the use of bio-pesticides in integrated pest management program is recommended. Therefore, in this research, effects of Bacillus thuringiensis subsp. kurstaki, Spodoptera exigua nucleopolyhedrovirus (SeNPV), Spinosad and Emamectin were evaluated on 1st larval instar of S. exigua in laboratory (25±2 ºC, 57±2 RH and 16: 8 L: D) and in field conditions. In the laboratory experiments, LC50 values of different concentrations of B. thuringiensis, SeNPV virus, Spinosad and Emamectin were determined after 24, 48 and 72 h by probit analysis. Also, the effects of each compound using Henderson- Tilton formula and GLM analysis was evaluated after 1, 3, 7, 14 and 21 days in the field conditions. The results of probit analysis of different concentrations of Bt., Spinosad and Emamectin after 24, 48 and 72 hours were {( 0.47, 0.410, 978.158) ,(0.291,0.172 ,687.938 ) (0.218, 0.159, 595.714)}mg/L, and for SeNPV (0.76 ×105, 0.856×105, 1.578×105)OBs/L, respectively. Also, the highest and lowest mortality were related to Emamectin (95.33%), SeNPV virus (49.00%) after 21 days at field conditions. The highest and lowest percentages of damage were observed in the control (67.78 %), Emamectin and Spinosad (18.89 and 34.44%), respectively. Based on the laboratory and field results, Spinosad and Emamectin, were the most effective compounds for controlling this pest and further studies are required to compare the mentioned treatment economically. |
| Keywords: |
| Beet armyworm, Biological control, Bio-pesticides, Damage |
| Status : Paper Accepted (Oral Presentation) |
