Kilaso, Manlika
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Preferred name
Kilaso, Manlika
Alternative Name
Kilaso, M.
Main Affiliation
Email
manlika.ki@kmitl.ac.th
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Item type:Publication, Toxicity of synthetic insecticides on Tetragonula pagdeni (Hymenoptera Apidae)(2024-01-01); Chaisuekul, ChatchawanStingless bees are important pollinators in the ecosystem and crop production in most subtropical and tropical regions of the world. However, the global decline of bee populations is a serious concern. Insecticides are considered crucial factors affecting bee survival. In this study, the acute toxicity of selected synthetic insecticides (imidacloprid, profenofos, and lambda-cyhalothrin) on a stingless bee, Tetragonula pagdeni (Schwarz) (Hymenoptera Apidae), was investigated and the LD50 and LC50 determined through topical, oral, and contact exposure under laboratory conditions. The estimated topical LD50 values for imidacloprid, lambda-cyhalothrin, and profenofos were 0.06, 0.53, and 45.39 ng active ingredient (a.i.)/bee, respectively. The corresponding estimated LD50 values from oral bioassays were 0.66, 7.52, and 75.04 ng a.i./bee, and LC50 values for contact exposure were 48.74, 4,339.83, and 3,062.81 ng a.i./cm<sup>2</sup>. Overall, imidacloprid exhibited the highest toxicity among the evaluated insecticides for all routes of exposure. In addition, insecticide toxicity was higher in the topical bioassay than in oral and contact bioassays. These findings demonstrate that this stingless bee is extremely vulnerable to insecticide use. Therefore, selection of insecticides in pest control programs should consider mitigation of the risk to and detrimental effects on stingless bees. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Toxicity for Control of Frankliniella schultzei and Selenothrips rubrocinctus (Thysanoptera: Thripidae) of Several Common Synthetic Insecticides(2022-06-01)Thrips are serious pests of several kinds of crop plants throughout the world. Their attack leads to loss in plant production. Common blossom thrips, Frankliniella schultzei (Trybom), and red-banded thrips, Selenothrips rubrocinctus (Giard) (both Thysanoptera: Thripidae), are serious insect pests attacking various plants, such as tomato (Solanum esculentum Miller [Solanaceae]), mango (Mangifera indica Linnaeus [Anacardiaceae]), avocado (Persea americana Miller [Lauraceae]), and lotus flower (Nelumbo nucifera Gaertn. [Nelumbonaceae]). Currently, basic thrips control relies on synthetic insecticides. However, the toxicity of each existing insecticide for control of some specific pest species still has not been well established. This study evaluated and reported the toxicity of 6 insecticides (chlorantraniliprole, cypermethrin, carbosulfan, fipronil, abamectin, and spinetoram) for control of the 2 thrips species mentioned above. The evaluation was done by exposing 10 thrips to a bean dipped in insecticide, and mortality was recorded after 24 h of exposure under laboratory conditions. Spinetoram was the most toxic to F. schultzei with an estimated LC50 of 0.05 ng per μL. For red-banded thrips, S. rubrocinctus, the most toxic insecticides were abamectin, spinetoram, and fipronil, with LC50 values of 1.67, 1.85, and 4.23 ng per μL, respectively. On the other hand, the least toxic insecticide to common blossom thrips and red-banded thrips was chlorantraniliprole, with LC50 values of 270.51 and 641.08 ng per μL, respectively. Overall, among the tested chemicals, spinetoram was the most effective in controlling these pests. The findings from this study will benefit developers of insecticide management strategies in thrips control programs.