Plant Protection Research and Development Office

Chatuchak, Thailand

Plant Protection Research and Development Office

Chatuchak, Thailand
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Konvipasruang P.,Plant Protection Research and Development Office | Chandrapatya A.,Kasetsart University
Systematic and Applied Acarology | Year: 2015

Two new genera and four new species of the Diptilomiopidae from Thailand were described. They are Khamroka tomentosi gen. nov., sp. nov. on Ellipanthus tomentosus Kurz, Salaya takhronami gen. nov, sp. nov. on Sisyrolepis muricata (Pierre) Leenh. Diptilomiopus mandongii sp. nov. on Cordia dichotoma G. Forst. and Diptilomiopus khatkhaii sp. nov. on Oxyceros horridus Lour. © Systematic & Applied Acarology Society.

Tangchitsomkid N.,Plant Protection Research and Development Office | Chanmalee T.,Kasetsart University | Hodda M.,CSIRO
Australasian Plant Pathology | Year: 2014

Extraction of nematodes from plant roots is a very time- and labour-intensive process, so new methods offering advantages for either speeding or lessening workloads are highly desired, but must be tested before adoption. This paper reports a novel method for extraction of nematodes using ultrasonic waves that is fast and simple. It is also non-destructive to roots, and whole root systems can be sampled for migratory endoparasitic nematodes. The method was tested and optimized for extraction of Burrowing Nematodes (Radopholus similis) from the roots of the aquatic plant Anubias sp. in water. Different durations of treatment and ultrasonic frequencies were tested, and the number of nematodes and plant damage recorded. The highest extraction efficiencies per sample were obtained after 40 min or longer sonication at a frequency of 40 KHz, but the condition of the extracted nematodes was poor for identification at these long durations. Considering efficiency as number of nematodes extracted per unit time, optimal extraction was obtained with a duration of 20 min at a frequency of 40 KHz. With this duration there was little observable damage to nematodes (allowing use in experiments or inoculation trials), or plants (so that successfully replanting is possible). The ultrasonic method was compared with other extraction techniques, and was much more efficient than root incubation, shaking or mist chamber techniques, but a little less efficient per sample than the maceration-centrifugal-flotation method. The ultrasonic method is suitable for extracting migratory endoparasites and semi-endoparasites from plant roots. If present, ectoparasites are also extracted. Ultrasonic extraction requires less time and effort for root preparation than other methods, so it can be a lower cost method for routine use. Furthermore, it can be incorporated into a simple, cheap, mass-manufactured, portable and automated kit, which can be made widely available, so that the technique can be widely used. © 2014, Australasian Plant Pathology Society Inc.

Chandrapatya A.,Kasetsart University | Konvipasruang P.,Plant Protection Research and Development Office | Amrine J.W.,West Virginia University
Systematic and Applied Acarology | Year: 2016

Six new genera and new species of eriophyoid mites from Thailand were reported in this paper. They are Yangnarus dipterocarpi and Rapinarus maphoki on Dipterocarpus alatus Roxb. ex G.Don (Dipterocarpaceae); Longanella lamyai and Lamyacarus longani on Dimocarpus longan Lour. ssp. longan var. longan (Sapindaceae); Kradukarus suregadi on Suregada multiflora (A.Juss.) Baill. (Euphorbiaceae) and Wangthonga phayomae on Shorea roxburghii G. Don (Dipterocarpaceae). All of them are vagrants found on the under leaf surfaces. © Systematic & Applied Acarology Society.

Bart R.,University of California at Berkeley | Cohn M.,University of California at Berkeley | Kassen A.,University of California at Berkeley | McCallum E.J.,ETH Zurich | And 16 more authors.
Proceedings of the National Academy of Sciences of the United States of America | Year: 2012

Cassava bacterial blight (CBB), incited by Xanthomonas axonopodis pv. manihotis (Xam), is the most important bacterial disease of cassava, a staple food source for millions of people in developing countries. Here we present a widely applicable strategy for elucidating the virulence components of a pathogen population. We report Illumina-based draft genomes for 65 Xam strains and deduce the phylogenetic relatedness of Xam across the areas where cassava is grown. Using an extensive database of effector proteins from animal and plant pathogens, we identify the effector repertoire for each sequenced strain and use a comparative sequence analysis to deduce the least polymorphic of the conserved effectors. These highly conserved effectors have been maintained over 11 countries, three continents, and 70 y of evolution and as such represent ideal targets for developing resistance strategies.

Chandrapatya A.,Kasetsart University | Konvipasruang P.,Plant Protection Research and Development Office | Amrine J.W.,West Virginia University
Systematic and Applied Acarology | Year: 2015

Six new generic names are assigned to eriophyoid mites formerly collected by A. Chandrapatya and described by Chandrapatya & Boczek during 1991-2000. They are Makruta citri (Boczek, 1996) new combination, on Citrus hystrix DC. (Rutaceae); Vareeboona mangiferae (Chandrapatya, 1997) new combination, on Mangifera indica L. (Anacardiaceae); Khanthongella suregadi (Boczek & Chandrapatya, 2000) new combination, on Suregada multiflora (A.Juss.) Baill. (Euphorbiaceae); Mimenacarus glutinosae (Boczek, 1996) new combination, on Litsea glutinosa (Lour.) C.B. Robinson (Lauraceae); Bangkokarus diospyrosis (Chandrapatya, 1991) new combination, on Diospyros rhodocalyx Kurz (Ebenaceae); and Phayomoca talutus new combination on Shorea roxburghii G. Don (Dipterocarpaceae). Afemurseta acuminatae (Boczek & Chandrapatya, 2000) new combination on Musa acuminata Colla (Kluai Pa), (Musaceae) is also reported. © Systematic & Applied Acarology Society.

Oliveira D.C.,University of Sao Paulo | Charanasri V.,Plant Protection Research and Development Office | Kongchuensin M.,Plant Protection Research and Development Office | Konvipasruang P.,Plant Protection Research and Development Office | And 3 more authors.
Zootaxa | Year: 2012

Little has been published about the phytoseiid mite fauna of Thailand. This paper presents information about the morphology and distribution of phytoseiid mites collected in Thailand between 1991 and 2011 on different plant species, a list of the species presently known from that country, and a key for their identification. Twenty six species belonging to 11 genera were collected and identified in this study, six of which are reported for the first time from Thailand. In total, 38 species of phytoseiid species of 13 genera are reported, 29 of Amblyseiinae, seven of Phytoseiinae and two of Typhlodrominae. Copyright © 2012 Magnolia Press.

Colomerus Newkirk & Keifer, 1971 is an eriophyid genus described by Newkirk and Keifer about 43 years ago, that contains species from all continents, except Antarctica. They live mostly on dicotyledonous plants. Colomerus novahebridensis Keifer, 1977 was described from coconut (Cocos nucifera L., Arecaceae) fruits from Vanuatu. A description of a Thai population of this species is given in this paper. A revised characterization of Colomerus and a dichotomous key for the separation of the species presently considered to belong to this genus are provided, and a consideration about the importance of Colomerus species is presented.

PubMed | Cambodian Agricultural Research and Development Institute, Qingdao Agricultural University, National Agriculture and Forestry Research Institute, Ministry of Agriculture and Irrigation and 3 more.
Type: | Journal: Scientific reports | Year: 2016

The white-backed planthopper, Sogatella furcifera (Horvth) (Hemiptera: Delphacidae), is a serious pest of rice in Asia. However, little is known regarding the migration of this pest insect from the Greater Mekong Subregion (GMS) including Cambodia, Laos, Myanmar (Burma), Thailand, and Vietnam, into Chinas Yunnan Province. To determine the migration patterns of S. furcifera in the GMS and putative secondary immigration inside Chinas Yunnan Province, we investigated the population genetic diversity, genetic structure, and gene flow of 42 S. furcifera populations across the six countries in the GMS by intensive sampling using mitochondrial genes. Our study revealed the potential emigration of S. furcifera from the GMS consists primarily of three major sources: 1) the S. furcifera from Laos and Vietnam migrate into south and southeast Yunnan, where they proceed to further migrate into northeast and central Yunnan; 2) the S. furcifera from Myanmar migrate into west Yunnan, and/or central Yunnan, and/or northeast Yunnan; 3) the S. furcifera from Cambodia migrate into southwest Yunnan, where the populations can migrate further into central Yunnan. The new data will not only be helpful in predicting population dynamics of the planthopper, but will also aid in regional control programs for this economically important pest insect.

Tungmunnithum D.,Chulalongkorn University | Boonkerd T.,Chulalongkorn University | Zungsontiporn S.,Plant Protection Research and Development Office | Tanaka N.,Tsukuba Botanical Garden
Phytotaxa | Year: 2016

Monochoria vaginalis s.l. is an annual aquatic herb belonging to the family Pontederiaceae and having an extensive distribution in tropical and subtropical Asia, Africa, and Australia. The taxon is extremely variable and morphologically complicated. In Thailand, it is recognized as a monotypic species but displays great variations not only in vegetative but also in reproductive structures. Because of these variations, its taxonomic status and species boundary remain uncertain. Morphological investigation was conducted on 244 living specimens of M. vaginalis s.l. covering the current distribution in Thailand together with a detailed observation of 80 herbarium specimens. The holotype of M. vaginalis var. angustifolia and its related specimens were also re-examined. The present study points out that M. vaginalis can be separated into 2 morphological forms: based on leaf shapes, leaf base, number of flowers/raceme, flower arrangements, seed shapes and its longitudinal ridges. Furthermore, the living specimens were used for two cluster and one canonical discriminant analyses in a phenetic study to collect additional data for new taxonomic insights. A total of 22 quantitative and 12 qualitative characters were employed. The first cluster analysis using only quantitative characters and the second cluster analysis using both quantitative and qualitative characters displayed the same trends. The specimens separated into two distinct groups. Likewise, canonical discriminant analysis also indicated that there were two groups. The two groups can be distinguished by the petiole length of floral-leaf and peduncle length. In conclusion, the results from morphological and phenetic studies support the segregation of M. vaginalis s.l. in Thailand into two taxa. © 2016 Magnolia Press.

PubMed | Ibaraki University and Plant Protection Research and Development Office
Type: | Journal: Experimental & applied acarology | Year: 2016

The effects of copulation duration on reproduction were studied in two important biological control agents, Neoseiulus womersleyi (Schicha) and Neoseiulus longispinosus (Evans), to better understand their reproductive potential. The number of eggs produced was significantly and positively related to the copulation duration in both species. Egg production was observed even in females which experienced only 15min of copulation and increased as copulation period increasedin both species. Both pre- and post-oviposition periods of N. womersleyi and N. longispinosus decreased with the increase of copulation durations, and they were significantly different between the two species. Copulation duration had no effect on the female adult longevity of N. womersleyi and N. longispinosus, but N. womersleyi showed higher adult longevity than N. longispinosus. Fecundity remarkably increased in both species when the copulation period exceeded 90min. The size of the spermatophore inside the spermathecae increased in proportion to the copulation duration in both species. Fecundity was consistent with the sizes of the spermathecae and spermatophores. When copulation was extended, males first filled one spermatheca and then filled the other. The results obtained in this study suggest that copulation duration had similar effects on egg production in N. womersleyi and N. longispinosus. Egg production depended on the quantity of sperm transferred during copulation. The two species have similar reproductive potentials and mating properties under laboratory conditions.

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