Entomology and Zoology Group

Bangkok, Thailand

Entomology and Zoology Group

Bangkok, Thailand
Time filter
Source Type

Punyawattoe P.,Nanjing Agricultural University | Punyawattoe P.,Entomology and Zoology Group | Han Z.,Nanjing Agricultural University | Sriratanasak W.,Bureau of Rice Research and Development | And 3 more authors.
Applied Entomology and Zoology | Year: 2013

This article reports the current status of ethiprole resistance in Nilaparvata lugens Stål in the central region of Thailand, together with the associated resistance mechanisms. A resistance survey found that a field population had developed 308. 5-fold resistance to ethiprole. Further selection with ethiprole for nine generations in the laboratory led to 453. 1-fold ethiprole resistance. However, following this selection procedure, the resistance of N. lugens to other insecticides decreased to about one-third of its original resistance. This result implies that there is no cross-resistance between ethiprole and other kinds of insecticides in this pest. In an in vivo study of synergisms, triphenyl phosphate (TPP) exhibited a strong synergism (SR 4. 2) with ethiprole in the resistant hoppers, piperonyl butoxide (PBO) also showed significant synergistic effects with ethiprole (1. 6), but diethyl maleate (DEM) did not show any obvious synergism with ethiprole (1. 2). An in vitro biochemical study indicated that esterase activity increased with ethiprole resistance in N. lugens, that P450 monooxygenase activity also increased significantly with high resistance, but that glutathione S-transferase activity did not. These results reveal that increases in esterase activity and P450 monooxygenase activity cause the ethiprole resistance observed in the field populations of N. lugens. Whether the mechanisms for ethiprole resistance involve target-site sensitivity is not yet known; further molecular analysis is required. However, an analysis of insecticide cross-resistance and the insecticide application history of the resistant populations indicated that target resistance was present and that rotation between insecticides with different modes of action will provide a key countermeasure to maintain the efficacy of ethiprole. © 2013 The Japanese Society of Applied Entomology and Zoology.

Somta C.,Kasetsart University | Winotai A.,Entomology and Zoology Group | Ooi P.A.C.,Kasetsart University
Journal of Asia-Pacific Entomology | Year: 2010

Bactrocera fruit flies (Diptera: Tephritidae) are pests of cultivated plants worldwide. Many Bactrocera flies are specific to commercial vegetable and fruit crops but some may develop in alternate hosts. One such alternate host is malabar or Indian almond, Terminalia catappa L. (Combretaceae) in Thailand. We studied a wild mature tree that was at least 20 years old and growing in a protected environment of Kasetsart University Kamphaeng Saen campus in 2008. We found that fruit flies and their associated parasitoids were recovered only from ripening (yellow colored) malabar almond fruits. Four species of fruit flies were recorded: Bactrocera dorsalis (Hendel), B. correcta (Bezzi), B. latifrons (Hendel) and B. cucurbitae (Coquillett). Of the four species of parasitoids recorded; the braconid Fopius arisanus (Sonan) (Hymenoptera: Braconidae) was most commonly recovered. © 2009 Korean Society of Applied Entomology, Taiwan Entomological Society and Malaysian Plant Protection Society.

Yasunaga T.,American Museum of Natural History | Yamada K.,Tokushima Prefectural Museum | Duangthisan J.,Entomology and Zoology Group | Artchawakom T.,Thailand Institute of Scientific and Technological Research
Zootaxa | Year: 2016

The deraeocorine plant bug genus Fingulus Distant from Indochina is reviewed, diagnosed and discussed. Seven species are currently recognized, including two new species described herein: F. angkorensis and F. rubricatus from Cambodia and Thailand. Behavior and habitat of F. angkorensis are documented, which was observed to be associated with two anthocorids and a thrips in leaf margin curl-galls produced by the thrips on a banyan tree Ficus microcarpa. A checklist including two species of the assumed sister genus Angerianus Distant is provided, with available distributional records; images of two Angerianus species are also shown for the first time. Copyright © 2016 Magnolia Press.

Parsa S.,Centro Internacional Of Agricultura Tropical Ciat | Kondo T.,Research Center Palmira | Winotai A.,Entomology and Zoology Group
PLoS ONE | Year: 2012

Phenacoccus manihoti Matile-Ferrero (Hemiptera: Pseudococcidae), one of the most serious pests of cassava worldwide, has recently reached Asia, raising significant concern over its potential spread throughout the region. To support management decisions, this article reports recent distribution records, and estimates the climatic suitability for its regional spread using a CLIMEX distribution model. The article also presents a taxonomic key that separates P. manihoti from all other mealybug species associated with the genus Manihot. Model predictions suggest P. manihoti imposes an important, yet differential, threat to cassava production in Asia. Predicted risk is most acute in the southern end of Karnataka in India, the eastern end of the Ninh Thuan province in Vietnam, and in most of West Timor in Indonesia. The model also suggests P. manihoti is likely to be limited by cold stress across Vietnam's northern regions and in the entire Guangxi province in China, and by high rainfall across the wet tropics in Indonesia and the Philippines. Predictions should be particularly important to guide management decisions for high risk areas where P. manihoti is absent (e.g., India), or where it has established but populations remain small and localized (e.g., South Vietnam). Results from this article should help decision-makers assess site-specific risk of invasion, and develop proportional prevention and surveillance programs for early detection and rapid response. © 2012 Parsa et al.

Chotwong W.,Entomology and Zoology Group | Tanikawa A.,University of Tokyo
Acta Arachnologica | Year: 2013

Four spider species, Chrysso trimaculata Zhu, Zhang & Xu 1991, Argiope dang Jäger & Praxaysombath 2009, Cyclosa cucurbitoria (Yin, Wang, Xie & Peng 1990), and Thiania bhamoensis Thorell 1887, are newly recorded from Thailand. © Arachnological Society of Japan.

Chotwong W.,Entomology and Zoology Group | Tanikawa A.,University of Tokyo | Miyashita T.,University of Tokyo
Acta Arachnologica | Year: 2013

Male spider specimens collected in Thailand were identified as males of Anepsion japonicum Yaginuma 1962. There was no conclusive evidence that female specimens collected at the same time belong to the same species, because the female of the species has not been described. We compared morphological data and mt-COI sequencing data for these female specimens with those of males and concluded that the female specimens belonged to the same species as the males. However, comparison of morphological data for the females and the holotype of Paraplectana japonica Bösenberg & Strand 1906 revealed that Anepsion japonicum Yaginuma 1962 is a junior synonym of P. japonica. Furthermore, after examining the taxonomic features of the holotype of P. japonica, it became clear that this species should be placed in the genus Anepsion. Therefore, the specific name was changed to Anepsion japonicum (Bosenberg & Strand 1906). Consequently, this work permits recording of two new spider species from Thailand: Anepsion depressum (Thorell 1877) and Anepsion japonicum (Bösenberg & Strand 1906). © Arachnological Society of Japan.

Dankittipakul P.,Chiang Mai University | Tavano M.,Museo Civico di Storia Naturale Giacomo Doria | Chotwong W.,Entomology and Zoology Group | Singtripop T.,Chiang Mai University
Zootaxa | Year: 2012

The female holotype of Clubiona distincta Thorell, 1887 from Myanmar is illustrated for the first time. It is considered a junior synonym of C. filicata Pickard-Cambridge, 1874 originally described from India. Two new species belonging to the genus Clubiona are described from Thailand. These taxa are C. digitata sp. nov., and C. aberrans sp. nov. The conspecific female of C. filifera Dankittipakul, 2008 is designated and described. Clubiona melanothele Thorell, 1895 and C. corrugata Bösenberg & Strand, 1906 are recorded from Thailand for the first time. Copyright © 2012 Magnolia Press.

Loading Entomology and Zoology Group collaborators
Loading Entomology and Zoology Group collaborators