赤帶薊馬（＂Selenothrips rubrocinctus＂）對荔枝葉片之危害與殺蟲劑藥效測試

Abstract

Red banded thrip (＂Selenothrips rubrocinctus＂) is a polyphagous pest widely distributed in tropical and subtropical regions in the world. The thrip attacks various fruit trees such as cacao, cashew, mango, avocado, and guava in certain habitats. In this study, we first recorded the infestation of red banded thrips on litchi in Taiwan. We observed the damage on leaves of 'Hak Ip', 'No Mai Tsz (73- S-20)', 'Tainung No. 3 (Rose Red)', 'Tainung No. 5 (Ruby)', and 'Tainung No. 7 (Early Big)' litchis in the orchard at Chiayi Agricultural Experiment Station of Taiwan Agricultural Research Institute in November, 2014, after a warm and dry period in almost half of year. Surface of infested litchi leaves, especially nearby the midrib, showed bronzing and patched necrosis. Upper epidermis and mesophyll in damage tissues are shriveled, distorted and even disorganized. We also tested toxicity of 5 insecticides, including 40.8% chlorpyrifos EC (1,000× dilution), 50.0% fenthion EC (1,000× dilution), 2.4% deltametrin SC (1,500× dilution), 85.0% carbaryl WP (850× dilution), and 40.46% carbofuran SC (1,000× dilution) to red banded thrips in the study. All the insecticides killed 100% larva and adults of thrips within 24 h after leaf-dip assays. Our results suggest that massive occurrence of red banded thrips can be avoided under conventional pest management.