Takashi Tsunoda

Institute of Horticulture, Ibaraki Agriculture Research Center · Plant pathology and Entomology

The attractive baited lethal ovitrap, an autocidal ovitrap, is an alternative tool to control mosquitoes by attracting ovipositing females to lay their eggs in artificial containers. Ovitrap attracts female mosquitoes by biotic factors, such as larval food and conspecific larvae. Long-lasting matrix-release formulations containing 2% pyriproxyfen,...

Ovitraps were set inside and outside of 15 households in December 2012 (dry season) and August 2013 (rainy season) in 2 communes (An Thanh and Phu Hoa) of Binh Duong Province in southern Vietnam. Eggs laid in the ovitraps were collected after 4 days, dried, and soaked in water. Hatched larvae were transferred to cups and reared to adulthood to iden...

Background Japanese encephalitis is a severe disease of acute encephalitis, with children and the elderly primarily affected, and with mortality rates reaching over 25%. The virus is transmitted mainly by species of the Culex (Culex) vishnui subgroup, primarily the widely spread Cx. tritaeniorhynchus Giles. The latter is known as a highly migratory...

The shape and color of an ovitrap affect the sampling efficiency of mosquitoes. We examined the effect of perforated lids of different colored cups on the preference of Aedes aegypti and Ae. albopictus for oviposition containers. The mosquito species were collected from Tuy Hoa City, Phu Yen Province, Vietnam in April 2016. Females of both species...

IntroductionAedes albopictus (Skuse) is an important vector of arboviral diseases, including dengue, chikungunya and Zika virus disease. Monitoring insecticide resistance and mechanisms by which the mosquito develops resistance is crucial to minimise disease transmission.AimTo determine insecticide resistance status and mechanisms in Ae. albopictus...

A 57-year old male, who had taken part in a field investigation of Japanese serow, Capricornis crispus, was bitten by a tick in Shimokita Peninsula in Aomori Prefecture, northern Honshu, Japan in late December 2007. The female tick was found attached to his left chest. The author, who also took part in the field investigation, removed the tick with...

We studied the winter activity of Aedes albopictus (Skuse) from November 2008 to April 2009 in Bat Trang village of Hanoi, Vietnam. We selected 12 houses and collected: 1) adults with BG sentinel traps, 2) pupae from household water containers, and 3) eggs with ovitraps. Aedes albopictus adults, pupae, and eggs were not collected from early January...

We collected larval trombiculid mites on vegetation monthly from October 1997 to February 2000, and from the heads of sika deer culled in March 2003 in Boso Peninsula, central Japan. Two species of trombiculid mites, Neotrombicula nogamii Takahashi, Takano, Misumi, and Kikuchi and Leptotrombidium scutellare Nagayo, Miyagawa, Mitamura, and Tamiya, o...

Tick identification is important in control of tick-born diseases because tick-borne pathogens are often transmitted by specific tick species. In this study, we determined partial DNA sequences of the mitochondrial 16S rDNA gene (mt-rrs) for ticks including 7 genera and 39 species, and these ticks were allocated to 113 sequence types. Of the 39 spe...

Dengue occurs throughout the year in Hanoi, Vietnam, despite winter low temperatures <10°C. During July 2010 to March 2012, we surveyed monthly for Aedes larvae and pupae in 120 houses in 8 Hanoi districts. Aedes albopictus preferred discarded containers in summer and pupal density drastically decreased in winter. Aedes aegypti preferred concrete t...

Ixodid ticks were collected from 13 sika deer, Cervus n. nippon, shot in the Boso Peninsula in central Japan from late February to early March 1999. Haemaphysalis megaspinosa was the most abundant species of the adults collected, although Haemaphysalis longicornis, H. flava, H. kitaokai, H. cornigera, Ixodes ovatus, and Amblyomma testudinarium were...

Background Jars, tanks, and drums provide favorable rearing/breeding sites for Aedes aegypti in Vietnam. However, the use of insecticides to control mosquitoes at such breeding sites has not been approved in Vietnam since they are also often sources of drinking water, making larval vector control difficult. Mosquito nets pre-treated with long-lasti...

An investigation of habitat preference for larval breeding sites by Aedes (Diptera: Culicidae) mosquitoes which occur around human dwellings in Ishigaki-jima and Taketomi-jima Islands revealed that Ae. albopictus Skuse 1894 preferred pools in tires and boats and was distributed widely from the coast, inland. Although Ae. riversi Bohart & Ingram, 19...

The large and recent migrations of the main vector of the Chikungunya virus, Aedes albopictus, raise questions about the epidemiological impact of possible microevolutionary changes in new territories. Quantitative traits are suitable to detect such changes as induced by environmental adaptations, local competition and founder effects. Using landma...

To elucidate the annual lifecycle of the bean bug, Riptortus pedestris Fabricius, especially its characteristics on potential host plants before it attacks soybeans, we investigated the seasonal prevalence of the bean bug in Chinese milk vetch, red clover, and soybean fields from 2004 to 2008. In Chinese milk vetch fields, adults of R. pedestris ap...

The effects of dietary sugar and body size on the oviposition of Ae. aegypti were studied under laboratory conditions. In female mosquitoes provided with sugar, the start of maximum fecundity was significantly delayed and the oviposition period was longer than in females provided with water. The peak of oviposition was also delayed in sugar-fed fem...

To assess the effect of installation of a water supply system on the distribution of water storage containers and abundance of Aedes aegypti immatures, we conducted two successive entomological surveys in October 2007 and July 2008 in an urban neighbourhood of Ho Chi Minh City, Viet Nam. In all, 850 water-holding containers, including plastic bucke...

This study aimed to evaluate the effects of existing practices of residents in reducing pre-adult Aedes aegypti (L.) infestation and to assess the effect of dengue-related knowledge on the practices. A house-to-house survey was conducted in two areas with different socioeconomic status in Ho Chi Minh City between October and November 2007. Some res...

We investigated the flight speed and flight duration of Riptortus pedestris (Fabricius) (Heteroptera: Alydidae) and Leptocorisa chinensis Dallas (Heteroptera: Alydidae) to estimate their flight distance by measuring the speed of stinkbugs flying towards a window in a room with a speed sensor. R. pedestris flew faster than L. chinensis although ther...

The survival of all stages of Haemaphysalis longicornis was investigated at different densities and at 3 levels of relative humidity. Larvae survived longer when the density was higher, or the size of a cluster was larger, or both. However, in nymphs and adults, there was no significant relationship between the density and the survival period. More...

Habitat use of Hemaphysalis longicornis Neumann (Acari: Ixodidae) was observed from February 1998 to January 2000 in Boso Peninsula, central Japan. The number of ticks collected from plants (by hand) and from litter and soil (by the vinyl method) was compared seasonally. Laboratory experiments showed that the vinyl method effectively collected 97%...

The effects of intraspecific and interspecific interactions on preferred questing sites of ticks, specifically nymphs and larvae of Haemaphysalis longicornis and Haemaphysalis megaspinosa, were examined in Boso Peninsula of central Japan from October 1996 to September 1999. Haemaphysalis longicornis were primarily segregated from H. megaspinosa by...

There were five recorded cases of tick bite among researchers studying deer in Boso Peninsula between October 2000 and May 2001. The species of human-biting ticks were Haemaphysalis longicornis (one male and one nymph), H. megaspinosa (two nymphs) and Amblyomma testudinarium (one nymph).

CORRIGENDUM “Questing height of nymphs of the bush tick, Haemaphysalis longicornis, and its closely related species, H. mageshimaensis: correlation with body size of the host” - Volume 129 Issue 3 - T. TSUNODA, S. TATSUZAWA

The questing height (i.e. ambush height) of ticks on a plant plays an important role in host selection. To test the hypothesis that the questing height of ticks in a locality had adapted to the body size of the host in that locality, we examined the questing height of nymphs of the ticks, Haemaphysalis longicornis and H. mageshimaensis, at 7 locati...

The density of nymphs of the bush tick, Haemaphysalis longicornis, was investigated by the catch effort method with flagging. The spatial distribution of H. longicornis nymphs fit the model of contagiously distributed colonies by Iwao's m*-m analysis (Iwao 1968). A sequential sampling method was used to predict the theoretical point at which to sto...

The questing height of the tick Haemaphysalis longicornis Neumann was studied on the plant species Solidago altissima L., Pteridium aquilinum Kuhn, Miscanthus sinensis Anderss, and Pleioblastus chino Makino in an abandoned rice field and in an ume (Japanese Apricot) orchard in a forest. On all plant species, the vertical distribution of tick adults...

The mate-receptivity behavior and reproductive capacity of single-and multiple-mated females of a predacious mite, Amblyseius womersleyi, were examined. Although most females rejected a second mating within one day after the first mating (1 day later), they accepted it towards the end of the oviposition period (10 days later). Females that had expe...

The Height of attachment to host was investigated in two species of ticks, Haemaphysalis megaspinosa and Haemaphysalis longicornis, in the southern part of Chiba Prefecture from March to May in 1992 and 1993. Laboratory experiment showed the attaching H. longicornis adults fell off more easily than H. longicornis nymphs. We wore flannel clothes mar...

In the southern part of Chiba Prefecture, we collected 24,539 ticks of 2 genera including 6 species on Sika deer Cervus nippon in October, 1990,August, 1993,and February and March, 1994. Haemaphysalis megaspinosa was the dominant species in October (92.9% of male, 89.8% of female, 91.2% of nymph), February (78.5% of male, 65.3% of female, 83.0% of...

Houseflies collected from six places in Nepal in August 1992 and colonized in the laboratory were examined for susceptibility to eight insecticides by a topical application method. Most adult houseflies were more susceptible to the insecticides tested than those of the susceptible strain (Takatsuki). Two pyrethroid insecticides, d-t, allethrin and...

Mating behavior of a native phytoseiid mite, Amblyseius womersleyi Schicha, was studied. Males searched for females more vigorously than females did for males. Females significantly differed from males in the method of approach to the mating partners. Males showed several variations in the pattern of copulatory behavior and the same male showed sev...

Studies on Supercooling and Cold-Hardiness in the House-Dust Mite Dermatophagoides pteronyssinus (Astigmata: Pyroglyphidae). Takashi TSUNODA, Hans MORI (Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido 060, Japan) and Kimio SHIMADA (Institute of Low-Temperature Science, Hokkaido University). Jpn. J. Appl. Entomol. Zool. 36: 1-4 (1992)...