Hiroshi Amano’s research while affiliated with Kyoto University and other places

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Publications (103)


Development and Reproduction of Neoseiulus californicus (Acari: Phytoseiidae) and Tetranychus urticae (Acari: Tetranychidae) Under Simulated Natural Temperature
  • Article

May 2018

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118 Reads

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8 Citations

Environmental Entomology

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Hiroshi Amano

Although laboratory observations provide basic knowledge of the development and reproduction of predacious and phytophagous mites, little is known of their behavior under natural conditions. Using a closed system designed to simulate natural climate patterns, we investigated the development and reproduction of the predatory mite Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) and the pest mite Tetranychus urticae Koch (Acari: Tetranychidae) at air temperatures typical of June to October at three latitudes (Aomori, Tottori, and Naha) in Japan. The peaks of development in both species showed similar trends at each location. The shortest developmental times for both species were observed during August in Aomori, from July to September in Tottori and during August and September in Naha. Development of T. urticae was not completed during October in Aomori due to the decreased air temperature. High reproduction (number of eggs produced during 5 d from the first oviposition) of N. californicus was attained at the conditions that shortened the developmental times (i.e., high-temperature months). T. urticae showed a reproduction trend similar to that of N. californicus except for the low number of eggs produced during August in Naha due to the high mortality of adult females and during October in Tottori due to diapause incidence. This information is in agreement with field observations and together might be useful for planning biological control programs for phytophagous mites and for successful establishment of predacious mites in new habitats.


Population Expansion of an Acarid Mite, Tyrophagus similis(Acari: Acaridae)due to the Presence of Soil Algae before Spinach Seeding

November 2017

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25 Reads

Japanese Journal of Applied Entomology and Zoology

It is known that an acarid mite, Tyrophagus similis Volgin, feeds on algae and grows on the soil surface in spinach greenhouses. However, no study was conducted on the effect of plowing algae before seeding to promote the mite population in the soil. We carried out observations of mite increase and spinach damage under different algae managements in 2015, both in the laboratory and greenhouses at Yamaguchi Pref., Western Japan. Propagation and plowing of algae before seeding promoted mite numbers and spinach damage in the greenhouse. This result was also supported by a supplementary laboratory experiment. In the laboratory experiment, the population of mites increased around 4 times when algae were introduced into the soil. Furthermore, additional observations demonstrated that high growth and coverage of algae on the soil surface before seeding resulted in a high population level of mites(3.5 times)in the greenhouse experiment. Our findings suggest that algae management of the greenhouse soil is an important practice for mite control in spinach production.


Dispersal of diapausing Tetranychus urticae and T. kanzawai

August 2016

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130 Reads

Entomologia Experimentalis et Applicata

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Tomoe Sekido

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Hiroshi Amano

The spider mites Tetranychus urticae Koch and Tetranychus kanzawai Kishida (Acari: Tetranychidae) overwinter mostly as mated adult diapausing females. Their overwintering survival depends in part on their dispersal towards suitable habitats. We investigated the dispersal behaviour of diapausing females of T. urticae and T. kanzawai with respect to factors known to affect the dispersal of non-diapausing mites: light, population density, gravity, and humidity. In general, diapausing females of T. urticae showed a stronger tendency to disperse than did those of T. kanzawai under all test conditions. High population density promoted the dispersal of diapausing T. urticae, but not of T. kanzawai. Dispersal of diapausing females of both species was not significantly affected by gravity, humidity, or whether feeding damage was caused by conspecifics or heterospecifics. On plants, more T. urticae than T. kanzawai moved downward. We propose that dispersal after the onset of diapause may be an important life-history strategy in T. urticae, but not in T. kanzawai.


Fig. 1 Survival curves of mated and unmated females of Neoseiulus californicus under LE (a, N = 51 and 45 for mated and unmated females, respectively), L (b, N = 30 for mated females and 30 for unmated females), and E (b, N = 30 for mated females and 30 for unmated females) treatments. Significant differences between survival curves in each treatment were analyzed with a Kaplan–Meier survival analysis followed by log-rank test  
Survival times (mean ± SE) of mated and unmated females of Neoseiulus californicus under LE, L, and E treatments. Different letters indicate significant differences (P < 0.05, Tukey’s tests). N = 30–51
Preoviposition period of mated and unmated females of Neoseiulus californicus after the LT50 survival under LE, L, and E treatments for LT50. The term ‘preoviposition period’ is used here for the period from the initiation of the observations to the deposition of the first egg. Different letters indicate significant differences (P < 0.05, Tukey’s tests). N = 12–16
Total number of eggs laid during the first 7 days of oviposition by mated and unmated females of Neoseiulus californicus after the LT50 survival under LE, L, and E treatments. Different letters indicate significant differences (P < 0.05, Tukey’s tests). N = 12–16
The use of the cannibalistic habit and elevated relative humidity to improve the storage and shipment of the predatory mite Neoseiulus californicus (Acari: Phytoseiidae)
  • Article
  • Publisher preview available

July 2016

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67 Reads

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6 Citations

Experimental and Applied Acarology

This study investigated the feasibility of using the cannibalistic habits of the mite Neoseiulus californicus (McGregor) and controlling the relative humidity (RH) to prolong the survival time during the storage or shipment of this predatory mite. Three-day-old mated and unmated females were individually kept at 25 ± 1 °C in polypropylene vials (1.5 mL), each containing one of the following items or combinations of items: a kidney bean leaf disk (L), N. californicus eggs (E), and both a leaf disk and the eggs (LE). Because the leaf disk increased the RH in the vials, the RH was 95 ± 2 % under the L and LE treatments and 56 ± 6 % under the E treatment. The median lethal time (LT50) exceeded 50 days for the mated and unmated females under the LE treatment. However, it did not exceed 11 or 3 days for all females under the L or E treatments, respectively. Under the LE treatment, the mated and unmated females showed cannibalistic behavior and consumed an average of 5.2 and 4.6 eggs/female/10 days. Some of the females that survived for LT50 under each treatment were transferred and fed normally with a constant supply of Tetranychus urticae Koch. Unmated females were provided with adult males for 24 h for mating. Only females previously kept at LE treatment produced numbers of eggs equivalent to the control females (no treatment is applied). The results suggested that a supply of predator eggs and leaf material might have furnished nutrition and water vapor, respectively, and that this combination prolonged the survival time of N. californicus during storage. Moreover, this approach poses no risk of pest contamination in commercial products.

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Phytoseiid mites under environmental stress

March 2016

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413 Reads

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92 Citations

Biological Control

Predatory mites of the family Phytoseiidae are important natural enemies of phytophagous mites and small insects. Phytoseiid mites often experience a variety of stresses brought about by changing or fluctuating environmental factors in the field or laboratory or during their commercial production. These factors include abiotic stressors such as extreme temperature and humidity, ultraviolet radiation, and pesticides, and biotic stressors such as cannibalism, intraguild predation, food shortage, and pathogens, all of which affect the biocontrol potential of phytoseiid mites. The extent to which an environmental stressor may affect the biocontrol efficacy of phytoseiid mites depends on the characteristics of the species and on other concurrent stresses. In this review, we discuss the effects of environmental stressors on various biological and ecological aspects of phytoseiid mites, such as development, survival, reproduction, and predation, and the mites’ adaptation strategies to these stressors.


A new species of Zetzellia Oudemans (Acari, Trombidiformes, Raphignathoidea, Stigmaeidae) and a key to Stigmaeidae of Japan

November 2015

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306 Reads

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10 Citations

Systematic and Applied Acarology

A new mite species, Zetzellia camphorae sp. n. (Acari, Stigmaeidae), is described and illustrated based on adult females. Mites were collected from leaf domatia of camphor trees, Cinnamomum camphora (L.) J. Presl. (Lauraceae) infested with the eriophyid mite, Aceria sp. (Eriophyidae) in Kyoto, Japan. An identification key to the adult females of the Japanese Stigmaeidae is provided.


ENVIRONMENT MANAGEMENT TECHNOLOGY FOR CONTROLLING SPIDER MITES

September 2015

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94 Reads

Acta Horticulturae

Spider mites (Acari: Tetranychidae) are widespread phytophagous pests that cause serious damage to agricultural crops in fields and greenhouses. Growers have great difficulty in managing spider mites because many of the species easily develop a tolerance to acaricides. To offset the ineffectiveness of chemical measures, there is an urgent need to introduce physical and biological measures through integrated pest management (IPM). Hence, we have attempted to introduce an environment management technology for controlling spider mites, specifically: 1) diapause disruption of the twospotted spider mite Tetranychus urticae Koch and the Kanzawa spider mite T. kanzawai Kishida; and 2) effective use of the predatory mite Neoseiulus californicus McGregor (Acari: Phytoseiidae). Through our studies, we demonstrated the importance of environment management technology for controlling the spider mites. We also expect that physical and biological measures based on this technology will greatly contribute to the establishment of effective IPM for spider mites as well as other pest species.


The effects of prestarvation diet on starvation tolerance of the predatory mite Neoseiulus californicus (Acari: Phytoseiidae)

September 2015

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75 Reads

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8 Citations

Physiological Entomology

Understanding the factors affecting stress tolerance in phytoseiid mites is critical for their integration into biological control programs. In the present study, the effects of diet (varying in prey species, physiological status and phenotype) are examined on the future starvation tolerance of the predatory mite Neoseiulus californicus McGregor (Acari: Phytoseiidae). The predators are fed from egg to adulthood on diapausing or nondiapausing Tetranychus urticae, Tetranychus kanzawai (wild and albino strains) or the nondiapausing species Panonychus citri (wild and albino strains). Thereafter, 3-day-old mated adult females are held without food at 25 ± 1 °C and a relative humidity of 98 ± 2%. The survival of these starved females is observed daily until all females have died. The survival curves and mean survival times of N. californicus are found to vary among prey types and are significantly longer when the predator is fed with diapausing prey. This enhanced survival is consistent with high concentrations of glycogen and triacylglyceride in the body of the predator at the onset of starvation. The predators fed nondiapausing prey have shorter survival times, and the glycogen and triacylglyceride contents in their bodies are low or undetectable. The protein contents of the predator's body are similar after consuming different prey types, except for a high concentration when fed the albino strain of P. citri. Protein content is unlikely to play a direct role in starvation tolerance, although it may affect the response to varying glycogen and triacylglyceride levels. These findings indicate that nutritional value of prey has a strong impact on the starvation tolerance of N. californicus.


Behavioral Response of Tyrophagus similis (Acari:Acaridae) on the Soil Surface Algae Triggered by Humidity Changes

July 2015

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20 Reads

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1 Citation

Japanese Journal of Applied Entomology and Zoology

In recent years, damage caused by Tyrophagus similis Volgin (Acari: Acaridae) to greenhouse spinach increased and it is threatening the stable production of spinach. However, details of the climbing behavior of mites on spinach sprout and influence of soil surface algae on mite behavior in the greenhouse remain unknown. It is known that T. similis colonizes soil surface algae under a high humidity condition and that it shows good population increase after feeding algae. In this study, we investigated proximate factors for T. similis to move to spinach sprout. In 2012, we conducted laboratory tests to observe behavior of T. similis which aggregated on soil surface algae under two aerial humidity conditions (65%RH and 95%RH). The total number of mites, after 24 hs without algae, was largest on spinach sprout at the 65%RH condition and in the soil at the 95%RH condition, respectively. With algae as well as spinach sprout, mite numbers were also highest on spinach sprout at 65%RH but most mites moved to algae at the 95%RH condition. To test the feasibility of our findings, algal occurrence and mite damage were investigated in the greenhouse in Yamaguchi pref. in April 2013. Algae covered all soil surfaces when spinach was young, and then depending on dryness, algal distribution was sporadic at the harvest time. Areas without algae showed a high damaging index of mites showing a significant negative relationship between algal occurrence and mite damage. These results suggested that soil inhabiting mites aggregated on algae in humid condition and dry condition triggered their movement to spinach sprout.


Citations (91)


... Various abiotic conditions can influence the demographic parameters of an insect. The intrinsic rate of increase (r) for T. urticae was shown to decrease as light wavelength increased (Suzuki et al. 2005), However, no researches have assessed the population growth performance of a predatory mite when subject to wavelength of light. The present study demonstrates for the first time that demographic parameters of a phytoseiid mite are wavelength-dependent. ...

Reference:

Effects of visible light wavelength on development and demographic parameters of Phytoseiulus persimilis (Acari: Phytoseiidae)
(363) Effect of Visible Light Wavelengths on the Population Growth Rate of the Two-spotted Spider Mite (Tetranychus urticae Koch.)
  • Citing Article
  • July 2005

HortScience

... al., 2013) [4,9,20] which they also, illustrated that the temperature considered the main a biotic factor influencing the distribution and abundance of insects and mites in fields. [7,10,17] which studied the effect of temperature on T. urtcae, and also agreed with (Saeidi and Nemati 2017) [22] , who studied the relationship between temperature and developmental rate of mite from the same family (Tetranychidae), and also agreed with (Bhamare et.al., 2018) [3] , who studied the effect of weather parameters on population of sucking insect pests. [11] , who studied the impact of global warming scenarios on the life history of Tetranychus evansi (Acari: Tetranychidae). ...

Development and Reproduction of Neoseiulus californicus (Acari: Phytoseiidae) and Tetranychus urticae (Acari: Tetranychidae) Under Simulated Natural Temperature
  • Citing Article
  • May 2018

Environmental Entomology

... To determine reproductive interference between N. womersleyi and N. longispinosus, intraspecific and interspecific crosses were carried out. As phytoseiid mites are pseudo-arrhenotokous (Toyoshima and Amano 1999), females never oviposit without mating (Gotoh and Tsuchiya 2008). During copulation, females may receive sperm/seminal fluid proteins from males (Avila et al. 2011). ...

Cytological Evidence of Pseudo-arrhenotoky in Two Phytoseiid Mites, Phytoseiulus persimilis Athias-Henriot and Amblyseius womersleyi Schicha.
  • Citing Article
  • January 1999

Journal of the Acarological Society of Japan

... World distribution. Canada (Sciarappa et al. 1977), USA (Denmark and Evans 2011), Japan (Toyoshima et al. 2014), and Turkey (this study). ...

Occurrence of Typhlodromips sessor (De Leon) (Acari: Phytoseiidae) on Mexican Sunflower Tithonia rotundifolia (Miller) (Asteridae: Asteraceae) Planted around a Tea Plantation in Japan
  • Citing Article
  • January 2014

Journal of the Acarological Society of Japan

... In particular, fungi of the genus Fusarium sp. play a very important role not only in the infection of bulb crops but also in the enhancement of R. robini populations on infected onion bulbs (Okabe and Amano 1991;Ofek et al. 2014). Thus, the application of MPFs can decrease the infestation of the bulb mite, too. ...

Penetration and Population Growth of the Robine Bulb Mite, Rhizoglyphus robini Clapar'de (Acari: Acaridae), on Healthy and Fusarium-Infected Rakkyo Bulbs
  • Citing Article
  • January 1991

Applied Entomology and Zoology

... In the earlier researches, it has been showed that the bulb mite obviously penetrates faster into the fungal-infected rather than healthy bulbs. For instance, Okabe and Amano (1990) found that the Robine mite (R. robini) required 60 to 90 days to penetrate healthy bulbs of Rakkyo plants, whereas it needed only 14 days to penetrate Fusarium-infected bulbs. Similarly, Amiri-Jami (2023) observed that the bulb mite on infected saffron corms penetrated within two weeks, whereas on healthy or even injured corms the mite showed almost no increase during first three weeks and it was not able to penetrate and develop a stable colony on these corms. ...

Attractancy of Alcohols Isolated from Culture Filtrates of Fusarium Fungi for the Robine Bulb Mite, Rhizoglyphus robini CLAPAREDE (Acari : Acaridae), in Sand
  • Citing Article
  • August 1990

Applied Entomology and Zoology

... In the orchard, A. andersoni had not been observed until at least 2018before then, only the three above-mentioned native phytoseiid mite species had been observed. Amblyseius andersoni was found for the first time in Japan in 2014, in apple and apricot orchards in Nagano Prefecture in central Japan (Toyoshima et al. 2016). ...

Occurrence of Amblyseius andersoni (Chant) (Acari: Phytoseiidae) in deciduous fruit tree orchards in Japan
  • Citing Article
  • June 2016

Journal of the Acarological Society of Japan

... Lowering the temperature is not the only and indispensable condition when storing predatory mites. As a factor that contributes to better storage of Neoseiulus californicus is found sustaining in the habitation place of mites of increased relative humidity of 96 % [10]. However, unlike the works [2][3][4][5], it was noted that ticks are stored at a temperature of +25 ºС. ...

The use of the cannibalistic habit and elevated relative humidity to improve the storage and shipment of the predatory mite Neoseiulus californicus (Acari: Phytoseiidae)

Experimental and Applied Acarology

... The lower comparative toxicity to phytoseiids, however, does not itself ensure compatibility. If the bioacaricide significantly reduces the prey population, the lack of food may cause the decline and disappearance of the predator population, followed by an outbreak of the prey population [163]. Also, the consequences of approximately equal harmfulness of the recommended concentrations for predator and prey should be interpreted depending on the level of the harmful effects of a bioacaricide. ...

Phytoseiid mites under environmental stress
  • Citing Article
  • March 2016

Biological Control

... To our knowledge, the few examples are the works of Graves (1965) on Cypherotylus californicus (Lacordaire, 1842) (Erotylinae, Erotylini), Leschen (1994) on Coccimorphus sp. and Ischyrus sp. (Erotylinae, Erotylini and Tritomini, respectively), Sato et al. (1999) on Dacne picta Crotch, 1876 (Erotylinae, Dacnini), Carlton et al. (2000) on Loberus impressus LeConte, 1863 (Loberinae), Moreira et al. (2010) on "Mycotretus" apicalis Lacordaire, 1842 (Erotylinae, Tritomini; currently Mycomystes apicalis (Lacordaire), see Pecci-Maddalena et al. 2021a), Toki et al. (2014), focusing on the morphology of adults and immatures with comments on the biology of Doubledaya sinuata Zia, 1934 (Languriinae: Languriini), and more recently Zaitsev et al. (2016) on a review of larval Encaustini. Aside from that, descriptions and images of the eggs (e.g. ...

Selective oviposition by adult females and larval growth of Dacne picta Crotch (Coleoptera: Erotylidae) on different growing stages of the shiitake mushroom, Lentinula edodes
  • Citing Article
  • February 1999

Applied Entomology and Zoology