Efficacy of some bioinsecticides against the Colorado potato beetle Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) under laboratory conditions
The efficacy of three bioinsecticides: the microbial Naturalis (Beauveria bassiana), the botanical Pyrethrum FS EC (pyrethrin + sesame oil + soft potassium soap) and NeemAzal T/S (azadirachtin), allowed for application in organic farming in Bulgaria, against larvae and adult...
Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Plovdiv University Press
2020-12-01
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Series: | Journal of BioScience and Biotechnology |
Subjects: | |
Online Access: | https://editorial.uni-plovdiv.bg/index.php/JBB/article/view/323/256 |
Summary: | The efficacy of three bioinsecticides: the microbial Naturalis (Beauveria bassiana), the botanical Pyrethrum FS EC (pyrethrin + sesame oil + soft potassium soap) and NeemAzal T/S (azadirachtin), allowed for application in organic farming in Bulgaria, against larvae and adults of the Colorado potato beetle, Leptinotarsa decemlineata(Say) (Coleoptera: Chrysomelidae) was studied under laboratory conditions. The best results from the tested products showed microbial insecticide Naturalis (Beauveria bassiana). At a concentration of 0.2%, the efficacy reached 78.4% and 68.4% on the 5th day for larvae and adults, respectively, and 100% on the 7th day after the treatment for both larvae and adults. The preparation showed very good action in its low concentration (0.1%) –efficacy was 88.5% and 68.5% on the 7th day after the treatment for larvae and adults, respectively. Insecticides based on plant extracts showed very good results. The botanical insecticide Pyrethrum FS EC showed a fast initial action and good effectiveness. At a concentration of 0.1%, the efficacy reached 96.5% and 86.5% on the 5th day for larvae and adults, respectively, and 100% on the 7th day after the treatment for both. The preparation showed good action in its low concentration (0.05%) –efficacy was 84.3% and 68.4% on the 7th day after the treatment for larvae and adults, respectively. The botanical insecticide NeemAzal T/S at a concentration of 0.3% the efficacy was 81.8% and 63.7% for larvae and adults, respectively on the 7th day after the treatment. At its low concentration of 0.1%, the NeemAzal T/S had insufficient effect and efficacy was only was 59.3% and 29.8% on the 7th day after the treatment for larvae and adults, respectively. |
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ISSN: | 1314-6238 1314-6246 |