scholarly journals Coexistence and Competition betweenTomicus yunnanensisandT. minor(Coleoptera: Scolytinae) in Yunnan Pine

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Rong Chun Lu ◽  
Hong Bin Wang ◽  
Zhen Zhang ◽  
John A. Byers ◽  
You Ju Jin ◽  
...  
Keyword(s):  
Thin Layer ◽  
Bark Beetles ◽  
Yunnan Province ◽  
Southwest China ◽  
Lower Trunk ◽  
Competition And Cooperation ◽  
Pinus Yunnanensis ◽  
Pine Trees ◽  
Tomicus Minor ◽  
Intensity Of Competition

Competition and cooperation between bark beetles,Tomicus yunnanensisKirkendall and Faccoli andTomicus minor(Hartig) (Coleoptera: Scolytinae) were examined when they coexisted together in living Yunnan pine trees (Pinus yunnanensisFranchet) in Yunnan province in Southwest China.T. yunnanensisbark beetles were observed to initiate dispersal from pine shoots to trunks in November, while the majority ofT. minorbegins to transfer in December.T. yunnanensismainly attacks the top and middle parts of the trunk, whereasT. minormainly resides in the lower and middle parts of the trunk. The patterns of attack densities of these two species were similar, but withT. yunnanensiscolonizing the upper section of the trunk andT. minorthe lower trunk. The highest attack density ofT. Yunnanensiswas 297 egg galleries/m2, and the highest attack density ofT. minorwas 305 egg galleries/m2. Although there was significant overlap for the same bark areas, the two species generally colonize different areas of the tree, which reduces the intensity of competition for the relatively thin layer of phloem-cambium tissues where the beetles feed and reside.

Biology of Pissodes yunnanensis (Coleoptera: Curculionidae), a pest of Yunnan pine in southwestern China

2004 ◽  
Vol 136 (5) ◽  
pp. 719-726 ◽  
Author(s):  
Hongrui Zhang ◽  
Hui Ye ◽  
Robert A. Haack ◽  
David W. Langor
Keyword(s):  
Yunnan Province ◽  
Tree Mortality ◽  
Fourth Instar ◽  
Southwestern China ◽  
Old Growth ◽  
Optimal Development ◽  
Pinus Yunnanensis ◽  
First Instar ◽  
Pine Trees ◽  
Lateral Branches

AbstractPissodes yunnanensis Langor et Zhang, a pest of Yunnan pine, Pinus yunnanensis Franchet, in southwestern China, occurs at elevations of 2200–2800 m. These weevils infest Yunnan pine trees less than 20 years old but prefer trees 8–10 years old. Oviposition occurs mainly along the upper trunk on current-year and 1-year-old growth and occasionally on the upper lateral branches. Weevil feeding often kills the leader, which results in stem forking and crooking. At times, after 2–3 years of consecutive severe infestation, tree mortality occurs. In southwestern Yunnan Province, adults of this univoltine weevil emerge from infested stems from mid-April to mid-July. Eggs appear in late June, first-instar larvae in early July, and fourth-instar larvae in late March of the next year. First- and second-instar larvae feed in the phloem, and third-instar larvae move to the sapwood or pith, where they overwinter. In March, larvae resume feeding and development. Fourth-instar larvae excavate pupal chambers (chip cocoons) in the outer sapwood or pith, and pupation occurs from late March to late May. Optimal development of eggs and pupae occurs at 25 °C in the laboratory. Parasitism is the main cause of mortality in P. yunnanensis, accounting for 2%–25% of mortality among third- and fourth-instar larvae and 5%–10% among pupae.

scholarly journals Genetic diversity and population structure of rice stripe virus in China

2009 ◽  
Vol 90 (4) ◽  
pp. 1025-1034 ◽  
Author(s):  
Tai-Yun Wei ◽  
Jin-Guang Yang ◽  
Fu-Long Liao ◽  
Fang-Luan Gao ◽  
Lian-Ming Lu ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Yunnan Province ◽  
Southwest China ◽  
Eastern China ◽  
Rice Stripe Virus ◽  
Genetic Distances ◽  
Geographical Regions ◽  
Strong Negative Selection ◽  
Recent Outbreak

Rice stripe virus (RSV) is one of the most economically important pathogens of rice and is repeatedly epidemic in China, Japan and Korea. The most recent outbreak of RSV in eastern China in 2000 caused significant losses and raised serious concerns. In this paper, we provide a genotyping profile of RSV field isolates and describe the population structure of RSV in China, based on the nucleotide sequences of isolates collected from different geographical regions during 1997–2004. RSV isolates could be divided into two or three subtypes, depending on which gene was analysed. The genetic distances between subtypes range from 0.050 to 0.067. The population from eastern China is composed only of subtype I/IB isolates. In contrast, the population from Yunnan province (southwest China) is composed mainly of subtype II isolates, but also contains a small proportion of subtype I/IB isolates and subtype IA isolates. However, subpopulations collected from different districts in eastern China or Yunnan province are not genetically differentiated and show frequent gene flow. RSV genes were found to be under strong negative selection. Our data suggest that the most recent outbreak of RSV in eastern China was not due to the invasion of new RSV subtype(s). The evolutionary processes contributing to the observed genetic diversity and population structure are discussed.

scholarly journals Acronema crassifolium sp. nov. (Apiaceae), a distinct new species from Yunnan, southwest China

Phytotaxa ◽  
2013 ◽  
Vol 87 (3) ◽  
pp. 39
Author(s):  
HUAN-CHONG WANG ◽  
XIN-MAO ZHOU ◽  
HANG SUN ◽  
YUE-HUA WANG
Keyword(s):  
New Species ◽  
Pollen Morphology ◽  
Yunnan Province ◽  
Southwest China

Acronema crassifolium, a distinct new species endemic to Yunnan province, China, is described and illustrated. It is characterized by its thickly papery, ternate, abaxially dark purple leaves, terminal umbels with 8–13 rays, and absent calyx teeth. The pollen morphology of the new species is also described in this study.

A review of the non-lyctine powder-post beetles of Yunnan (China) with a new genus and new species (Coleoptera: Bostrichidae)

Zootaxa ◽  
2022 ◽  
Vol 5091 (4) ◽  
pp. 501-545
Author(s):  
YI-FENG ZHANG ◽  
LING-ZENG MENG ◽  
ROGER A. BEAVER
Keyword(s):  
New Species ◽  
Southeast Asia ◽  
Yunnan Province ◽  
New Genus ◽  
Southwest China ◽  
Geological History ◽  
Yunnan Region ◽  
Palearctic Region ◽  
History Of ◽  
First Time

The powder post beetles (Coleoptera: Bostrichidae) (except Lyctinae) of Yunnan Province in Southwest China are reviewed for the first time. Keys to twenty-six genera and fifty-two species from the Yunnan region are provided. One new genus and seven new species are described: Dinoderus (Dinoderastes) hongheensis sp. nov., Dinoderus (Dinoderastes) nanxiheensis sp. nov., Gracilenta yingjiangensis gen. nov., sp. nov., Calonistes vittatus sp. nov., Calophagus colombiana sp. nov., Xylodrypta guochuanii sp. nov. and Xylodrypta zhenghei sp. nov.. Fourteen species are recorded in China for the first time. The bostrichid fauna of Yunnan is compared with those of the neighbouring bio-geographically related Southeast Asian and Himalayan regions. The fauna has a close affinity with that of tropical Southeast Asia and a much weaker relationship with the Palearctic region. The differences with the Himalayas may reflect the separate evolutionary and complex geological history of the two areas.

scholarly journals Human paleodiet and animal utilization strategies during the Bronze Age in northwest Yunnan Province, southwest China

PLoS ONE ◽  
2017 ◽  
Vol 12 (5) ◽  
pp. e0177867 ◽  
Author(s):  
Lele Ren ◽  
Xin Li ◽  
Lihong Kang ◽  
Katherine Brunson ◽  
Honggao Liu ◽  
...  
Keyword(s):  
Bronze Age ◽  
Yunnan Province ◽  
Southwest China ◽  
Northwest Yunnan ◽  
Animal Utilization ◽  
The Bronze Age

Vegetation and climate evolution during the Last Glaciation at Tengchong in Yunnan Province, Southwest China

2019 ◽  
Vol 514 ◽  
pp. 441-452 ◽  
Author(s):  
Jixiao Zhang ◽  
Hai Xu ◽  
William D. Gosling ◽  
Jianghu Lan ◽  
John Dodson ◽  
...  
Keyword(s):  
Yunnan Province ◽  
Southwest China ◽  
Last Glaciation ◽  
Climate Evolution ◽  
Vegetation And Climate

scholarly journals Meiogyne oligocarpa (Annonaceae), a new species from Yunnan, China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10999
Author(s):  
Bine Xue ◽  
Yun-Yun Shao ◽  
Chun-Fen Xiao ◽  
Ming-Fai Liu ◽  
Yongquan Li ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
Yunnan Province ◽  
Southwest China ◽  
A New Species

Meiogyne oligocarpa sp. nov. (Annonaceae) is described from Yunnan Province in Southwest China. It is easily distinguished from all previously described Meiogyne species by the possession of up to four carpels per flower, its bilobed, sparsely hairy stigma, biseriate ovules and cylindrical monocarps with a beaked apex. A phylogenetic analysis was conducted to confirm the placement of this new species within Meiogyne. Meiogyne oligocarpa represents the second species of Meiogyne in China: a key to the species of Meiogyne in China is provided to distinguish it from Meiogyne hainanensis. Paraffin sectioning was undertaken to study the anatomy of the corrugations on the inner petals of Meiogyne oligocarpa to verify whether they are glandular.

Sign in / Sign up

Export Citation Format

Share Document