Abstract
From the aspect of biological control,the physical and chemical properties of venomous insecticidal plants in Heilongjiang province were studied,and physiologically active substances for insecticides were extracted from 9 kinds of insecticidal plants widely distributed in Heilongjiang province with Soxhlet-extraction method.The virulence test and control experiment with Dendrolimus superans Butler in larch forests of Keshiketeng County Jingpeng forestry centre in Chifeng of the Inner Mongolia were carried out.The 20 times diluents of extracts of 6 insecticidal plants including Pulsatilla dahurica(fisch.)Spr.,Angelica amurensis Schischk.,Dictamnus dasycarpus Turcz.,Chelidonium majus L.,Veratrum dahuricum Loes.f.and Angelica dahurica(Fisch.ex Hoffm.) Benth.et Hook.f.ex Franch.et Sav..exhibited good virulence effect on the 3-year larvae of Dendrolimus superans Butler,and the emendation mortalities were 85.0%,81.7%,80.0%,76.7%,73.3% and 60.0%,respectively.The control efficiency of 50 times diluents of extracts of 5 insecticidal plants including Pulsatilla dahurica(fisch.)Spr.,Chelidonium majus L.,Veratrum dahuricum Loes.f.,Dictamnus dasycarpus Turcz.,and Angelica amurengis Sehischk.on the Dendrolimus superans Butler were 62.0%,60.4%,58.6%,58.6% and 53.5%,respectively.The drug effects were compared to those of biological medicaments,botanical pesticides and chemical pesticides,and the results of this study provided references for the biological control of forest pests as well as the exploitation and utilization of venomous plant resources.
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