| 摘要: |
| [目的]进一步确定细辛醚的杀虫作用.[方法]在不同作用方式下测定了细辛醚对粘虫、桃蚜、菜青虫、棉铃虫、玉米象和赤拟谷盗等6种农业害虫的室内毒力.[结果]细辛醚对粘虫、桃蚜和菜青虫24 h的触杀LD50值分别为35.06,1.111,66.28 μg/头,在供试剂量下对棉铃虫、玉米象和赤拟谷盗成虫的触杀作用较差;对粘虫和玉米象的熏蒸LC50值分别为16.92(12 h)和7.53(72 h) μL/L;对玉米象有一定的忌避作用,忌避作用随时问延长而减弱;细辛醚质量浓度为1,5和10 mg/g的处理,33 d对玉米象的致死率分别为26.97%,86.51%和100%,1,5 mg/g处理33 d和76 d对玉米象种群抑制率分别为74.18%和96.54%,63.64%和81.28%;经细辛醚处理的粘虫幼虫表现出明显的兴奋、痉挛、麻痹和死亡等症状.[结论]细辛醚对粘虫有较好的熏蒸、触杀作用,对桃蚜、菜青虫具有较强的触杀作用,对玉米象有一定的熏蒸、忌避和种群抑制作用,而对棉铃虫和赤拟谷盗的活性较差,具有明显的杀虫选择性.细辛醚对昆虫的致毒症状与神经毒剂类似. |
| 关键词: 细辛醚 触杀作用 种群抑制作用 生物活性 |
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| 基金项目:国家“十五”攻关重大专项（2002BA516A04）；西北农林科技大学科研专项(30471156) |
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| Bioactivity of sarisan against several kinds of pests |
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| Abstract: |
| 【Objective】 The study was to further vertify the bioactivities and mechanism of sarisan.【Method】 The toxicity action of sarisan against several normal pests were investigated under the laboratory conditions.【Result】 Sarisan showed strong contac activity against the 4th-instar larvae of Mythimna separate,Myzus persicae and the 5th instar larvae of Pieris rapae.The LD50 values of contact were 35.06,1.11,66.28 μg/larva respectively.Sarisan had weak contact activity against Helicoverpa armigera,Sitophilus zeamais and Tribolium castaneum at the treatment concentration of sarisan.Sarisan also showed strong fumigation activity against 4th-instar larvae of M.separata and S.zeamais,the values of LC50 were 16.92 (12 h) and 7.53 (72 h) μL/L respectively.Sarisan also showed repellent activity against S.zeamais.Strong inhibition of the formation of populations was found of sarisan against S.zeamais.With sarisan at concentration of 1,5 and 10 mg/g for the larvae of S.zeamais by mixture pesticide method,the mortalities were 26.97%,86.51% and 100% on the 33th day after treatment respectively.The rate of inhibition of the formation of populations were 74.18%,96.54%,63.64% and 81.28% respectively for concentration of 1 and 5 mg/g after on the 33th day and on the 76th day of treatment.In vivo symptom was characterized by a definite sequence of events,starting with excitation,convulsion,paralysis,and death.【Conclusion】 The results showed that sarisan had selective insecticidal activity:it possessed strong biological activity to M.separata,P.rapae,M.persicae and S.zeamais,and weak biological activity to H.armigeraa and T.castaneum. |
| Key words: sarisan contact activity population inhibition insect activity |
