The artemisia weevil, Adosomus sp., has become an important wormwood （Artemisa ordosoca and A. sphaerocephala） pest in recent years in Ningxia Province, China. The number of larval instars should be determined befor...The artemisia weevil, Adosomus sp., has become an important wormwood （Artemisa ordosoca and A. sphaerocephala） pest in recent years in Ningxia Province, China. The number of larval instars should be determined before further studies on its life history, biology and integrate management of pest （IMP）. In this study, we measured the length and width of head capsule, based on frequency histograms and Dyar＇s law, from which we concluded that the larvae ofAdosomus sp. have four instars. Of the two variables measured, the width of head capsule provided the best division of instars. The average width of head capsule of the 1st instar larvae was 1.348±0.152 mm, the 2nd 2.109±0.199 mm, the 3rd 3.563±0.492 mm and the 4th 5.974±0.581 mm.展开更多
Adosomus sp. eats the leaves and oviposits on the stems ofArtemisia ordosica Krasch. Based on an analytical PTI-GC/MS method, 21 volatile organic compounds （VOCs） from the leaves ofA. ordosica were identified. The m...Adosomus sp. eats the leaves and oviposits on the stems ofArtemisia ordosica Krasch. Based on an analytical PTI-GC/MS method, 21 volatile organic compounds （VOCs） from the leaves ofA. ordosica were identified. The major operating equipment consisted of a DB-5 column （30 m × 0.32 mm × 0.25 μm） and a flame ionization detector （FID）. The amounts of the components from VOCs were determined by a peak area normalization method and 17 VOC components were identified by PTI-GC/MS. The elec- troantennogram （EAG） responses ofAdosomus sp. to 17 of the VOCs were tested. The results show that seven compounds, i.e., oci- mene, myrcene, R-（＋）-α-pinene, caryophyllene, S-（＋）-2-canene, humulene and （＋）limonene elicited strong EAG responses by female Adosomus sp., with myrcene and ocimene eliciting the strongest responses. It is interesting to note that male Adosomus sp. presented different EAG responses from females to those compounds. Four volatile compounds： β-pinene, myrcene, trans-ocimene and longipinene elicited strong EAG responses to males with myrcene eliciting the strongest response.展开更多
基金supported by the National Project of ScienceTechnology for the 11th Five-Year Plan in China (Grant No. 2006BADO8A12)
文摘The artemisia weevil, Adosomus sp., has become an important wormwood （Artemisa ordosoca and A. sphaerocephala） pest in recent years in Ningxia Province, China. The number of larval instars should be determined before further studies on its life history, biology and integrate management of pest （IMP）. In this study, we measured the length and width of head capsule, based on frequency histograms and Dyar＇s law, from which we concluded that the larvae ofAdosomus sp. have four instars. Of the two variables measured, the width of head capsule provided the best division of instars. The average width of head capsule of the 1st instar larvae was 1.348±0.152 mm, the 2nd 2.109±0.199 mm, the 3rd 3.563±0.492 mm and the 4th 5.974±0.581 mm.
基金supported by the technology pillar program in the "Eleventh Five-year" National Science and Technology Support Program of China (2006BA-D08A10)the program for Changjiang Scholars and Innovative Research Teams in Universities (PC-SIRT0607)
文摘Adosomus sp. eats the leaves and oviposits on the stems ofArtemisia ordosica Krasch. Based on an analytical PTI-GC/MS method, 21 volatile organic compounds （VOCs） from the leaves ofA. ordosica were identified. The major operating equipment consisted of a DB-5 column （30 m × 0.32 mm × 0.25 μm） and a flame ionization detector （FID）. The amounts of the components from VOCs were determined by a peak area normalization method and 17 VOC components were identified by PTI-GC/MS. The elec- troantennogram （EAG） responses ofAdosomus sp. to 17 of the VOCs were tested. The results show that seven compounds, i.e., oci- mene, myrcene, R-（＋）-α-pinene, caryophyllene, S-（＋）-2-canene, humulene and （＋）limonene elicited strong EAG responses by female Adosomus sp., with myrcene and ocimene eliciting the strongest responses. It is interesting to note that male Adosomus sp. presented different EAG responses from females to those compounds. Four volatile compounds： β-pinene, myrcene, trans-ocimene and longipinene elicited strong EAG responses to males with myrcene eliciting the strongest response.
