1Xylotrechus rusticus （Linnaeus） is one of the most destruc-tive woodborers in northeast China;it damages poplar and is listed as a domestic forestry quarantine pest. Overwintering larvae were collected during Octob...1Xylotrechus rusticus （Linnaeus） is one of the most destruc-tive woodborers in northeast China;it damages poplar and is listed as a domestic forestry quarantine pest. Overwintering larvae were collected during October 2012 and March 2013 in Harbin, China, to quantify indi-cators related to the insect’s overwintering strategy and the major cryo-protectants. The supercooling points （SCPs）, which ranged from-14.7＆#176;C to -2.9＆#176;C, were higher than the lethal temperatures of LT50 （-33.64＆#176;C） and LT99 （-40.17＆#176;C） after 24 h exposure. , also the minimum mean daily temperature （-24.5＆#176;C） and mean monthly temperature （-18.0＆#176;C） at the sampling site in January during 2008-2012. Thus, X. rusticus is a typical freezing-tolerant insect. Glycerol serves as a major cryoprotectant for overwintering larvae , because it was the only polyol accumulated during the winter and it also had a significant negative correlation with the SCP （p=0.033, R=0.907）. The glycogen and lipid are major sources of ener-gy and their levels decreased substantially in the middle of overwintering, when glycogen had a significant correlation with the SCP （p= 0.006, R=0.971） whereas the lipid contents did not. Moreover, inter-conversions between glycerol and glycogen, as well as mannose and glycogen, were suggested by their negative correlations. The water content did not change obviously during the winter and was not correlated with the SCP. The free amino acids in the hemolymph and the total protein contents of the bodies of larvae changed significantly during winter, although both had no correlations with the SCP.展开更多
We used scanning electron microscope （SEM） to observe the ultrastructure of stridulating organs in Xylotrechus rusticus L. We com- pared the morphological structure and size of stridulating organs, the numbers of a ...We used scanning electron microscope （SEM） to observe the ultrastructure of stridulating organs in Xylotrechus rusticus L. We com- pared the morphological structure and size of stridulating organs, the numbers of a tooth-like part used in stridulation and its presence in fe- males and males of this beetle. The alarm sound of X.. rusticus was re- corded first when it was stimulated, then we tested behavioral responses to this alarm sound. The alarm sound ofX. rusticus has a warning effect on conspecifics.展开更多
The occurrence and damage of Xylotrechus quadripes Chew were investigated in different time points and micro environments in Siman south island river coffee test demonstration field. The results showed that X. quadr/p...The occurrence and damage of Xylotrechus quadripes Chew were investigated in different time points and micro environments in Siman south island river coffee test demonstration field. The results showed that X. quadr/pes mainly damaged 5-year-old coffee trees. X. quadr/pes occurred one generation per year in Siman region, and the larval stage lasted 296 - 322 d. The adult could be found in four seasons because of different development progress and overlapping generations. In different micro environments, X. quadr/pes were mainly distributed in mixed forests and the coffee land in sunny slope. The adult enjoyed sunshine on the coffee trees at noon. The nattwal enemy Prislauacus nigripea kieff was found to parasitize in the larvae of X. quadripes, which could control the population of X. quadr/pes.展开更多
Based on the dynamic observation of Xylotrechus quadripes Chevrolat for consecutive three years, the living habits and damage status of X. quadripes in Dehong Prefecture, Yunnan Province were cleared, to provide the b...Based on the dynamic observation of Xylotrechus quadripes Chevrolat for consecutive three years, the living habits and damage status of X. quadripes in Dehong Prefecture, Yunnan Province were cleared, to provide the basis for its prevention and control. The results showed that the larvae and pupae of X. quadripes occurred from April to September in Dehong Prefecture;the adults occurred from September to November;the eggs occurred from December to March of the next year. Different measures could be adopted according to different periods, so as to achieve the best control effect.展开更多
基金supported financially by the National Science and Technology Projects(Grant No.2012BAD19B00)
文摘1Xylotrechus rusticus （Linnaeus） is one of the most destruc-tive woodborers in northeast China;it damages poplar and is listed as a domestic forestry quarantine pest. Overwintering larvae were collected during October 2012 and March 2013 in Harbin, China, to quantify indi-cators related to the insect’s overwintering strategy and the major cryo-protectants. The supercooling points （SCPs）, which ranged from-14.7＆#176;C to -2.9＆#176;C, were higher than the lethal temperatures of LT50 （-33.64＆#176;C） and LT99 （-40.17＆#176;C） after 24 h exposure. , also the minimum mean daily temperature （-24.5＆#176;C） and mean monthly temperature （-18.0＆#176;C） at the sampling site in January during 2008-2012. Thus, X. rusticus is a typical freezing-tolerant insect. Glycerol serves as a major cryoprotectant for overwintering larvae , because it was the only polyol accumulated during the winter and it also had a significant negative correlation with the SCP （p=0.033, R=0.907）. The glycogen and lipid are major sources of ener-gy and their levels decreased substantially in the middle of overwintering, when glycogen had a significant correlation with the SCP （p= 0.006, R=0.971） whereas the lipid contents did not. Moreover, inter-conversions between glycerol and glycogen, as well as mannose and glycogen, were suggested by their negative correlations. The water content did not change obviously during the winter and was not correlated with the SCP. The free amino acids in the hemolymph and the total protein contents of the bodies of larvae changed significantly during winter, although both had no correlations with the SCP.
文摘We used scanning electron microscope （SEM） to observe the ultrastructure of stridulating organs in Xylotrechus rusticus L. We com- pared the morphological structure and size of stridulating organs, the numbers of a tooth-like part used in stridulation and its presence in fe- males and males of this beetle. The alarm sound of X.. rusticus was re- corded first when it was stimulated, then we tested behavioral responses to this alarm sound. The alarm sound ofX. rusticus has a warning effect on conspecifics.
基金Supported by Scientific Research Fund Project of Yunnan Department of Education(2014Y508)Project of Yunnan Department of Finance(YCJ[2013]212)Project of Pu’er University for Professional Gardening Talents
文摘The occurrence and damage of Xylotrechus quadripes Chew were investigated in different time points and micro environments in Siman south island river coffee test demonstration field. The results showed that X. quadr/pes mainly damaged 5-year-old coffee trees. X. quadr/pes occurred one generation per year in Siman region, and the larval stage lasted 296 - 322 d. The adult could be found in four seasons because of different development progress and overlapping generations. In different micro environments, X. quadr/pes were mainly distributed in mixed forests and the coffee land in sunny slope. The adult enjoyed sunshine on the coffee trees at noon. The nattwal enemy Prislauacus nigripea kieff was found to parasitize in the larvae of X. quadripes, which could control the population of X. quadr/pes.
文摘Based on the dynamic observation of Xylotrechus quadripes Chevrolat for consecutive three years, the living habits and damage status of X. quadripes in Dehong Prefecture, Yunnan Province were cleared, to provide the basis for its prevention and control. The results showed that the larvae and pupae of X. quadripes occurred from April to September in Dehong Prefecture;the adults occurred from September to November;the eggs occurred from December to March of the next year. Different measures could be adopted according to different periods, so as to achieve the best control effect.
