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Youichi Kobori,Yupa Hanboonsong 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
The biological and life-history parameters of the leafhopper,Matsumuratettix hiroglyphicus (Matsumura), a vector of sugarcane white leaf phytoplasma,were studied on sugarcane host plants, at different constant temperatures, in the laboratory. The results revealed no complete life cycle development at extreme lowand high temperatures of 20 °C and 38 °C, respectively. There was a significant decrease in adult longevity, and reduced developmental time from egg to adult, with increasing temperatures. Low fecundity and reduced female oviposition period occurred at high temperatures. The sex ratio of male offspring appeared to be higher with increasing temperature (30–35 °C),while, at lower temperatures (25–27 °C), the ratio of female offspring appeared to be higher. According to the obtained life-history parameters, including intrinsic rate of increase (rm), finite rate of increase (λ), and net reproductive rate (R0) (rm=0.067, λ=10.70 days, and R0=21.2), 27 °C was the optimumtemperature for M. hiroglyphicus development. The lowest temperature developmental threshold and degree-days for leafhopper development from the egg to nymph stages was 11.5 °C and 132 degree-days, and for development from egg to adult, 12.8 °C and 345 degree-days. These results provide useful information for predicting M. hiroglyphicus population growth, and thus for evaluation of related insect control programs.
New bacterium symbiont in the bacteriome of the leafhopper Yamatotettix flavovittatus Matsumura
Jureemart Wangkeeree,Panida Tewaruxsa,Yupa Hanboonsong 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.3
The leafhopper Yamatotettix flavovittatus Matsumura is the vector of the phytoplasma pathogen that causes white leaf disease in sugarcane crops. This study aimed to identify the bacterial symbionts associated with Y. flavovittatus by amplifying, cloning, and sequencing their 16S rRNA genes. Two types of bacteria were present; one is Candidatus Sulcia muelleri (Bacteroidetes), a well-known ancient primary symbiont found in a diverse range of insects in Auchenorrhyncha suborder. The other is a member of Gammaproteobacteria that differed from all other members deposited in the GenBank database and was therefore named Candidatus Yamatotia cicadellidicola. These bacteria were present throughout the leafhopper life cycle and were found in 100% of the natural host populations examined. Fluorescent in situ hybridization analysis revealed that these bacteria were co-localized in the same bacteriome and present in the full-grown oocyte. Our main finding suggests the Ca. Y. cicadellidicola is a new type of symbiont that co-occurs with Ca. S. muelleri in the leafhopper Y. flavovittatus (Deltocephalinae subfamily).