Moisturized sheltered sachets are potentially useful for the efficient release of selected predators in a wide range of humidity environments

Shimoda, Takeshi; Kagawa, Yoshitake; Yoshizawa, Hitoshi; Nakano, Akio; Matsuhira, Kunihiko; Yanagita, Hirotsugu; Shimomoto, M.; Adachi-Hagimori, Tetsuya; Mori, Kotaro; Hinomoto, Norihide; Hiraoka, Tadashi; Nakajima, Tetsuo

doi:10.1007/s10526-018-09920-2

Cited by 8 publications

(12 citation statements)

References 42 publications

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“…For example, RH levels around the leaf layer (within 0.5-5.0 mm) are slightly higher than ambient due to leaf transpiration (Shipp et al 2009). Finally, to predict the suitability of this mite for augmentative release in a particular eld or greenhouse (Shimoda et al 2019), future experiments should investigate the effects of changes in temperature, RH and photoperiod throughout the entire growing season of the host plants.…”

Section: Life Table Parameters and Sex Ratiomentioning

confidence: 99%

“…However, water conservation is a major challenge due to their small size (0.2-0.5 mm in length); predatory mites lose water during respiration, by diffusion across the surface of the body and through the secretion of digestive uids and reproductive products as well as during oviposition and excretion (Arlian and Veselica 1979). Therefore, the successful release and colonization of predatory mites may be in uenced by the RH of the target area (Fatnassi et al 2015;Shimoda et al 2019). Species and strains of predatory mites that originate from different geographical regions exhibit varying responses to RH.…”

Section: Introductionmentioning

confidence: 99%

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Impact of relative humidity and water availability on the life history of the predatory mite Amblyseius swirskii

2021

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The predatory mite Amblyseius swirskii (Athias-Henriot) (Acari: Phytoseiidae) is currently used as an e cient biological control agent of thrips, white ies and spider mites, which are economically damaging pests of ornamental plants and vegetable crops grown in greenhouses and elds worldwide. Currently, the effects of relative humidity (RH) and water availability on the optimal growth of A. swirskii are unknown. Here, we test the combined effects of different levels of RH (33%, 53%, 73% and 92%) and water availability on the development and reproduction of male and female A. swirskii feeding on the dried fruit mite, Carpoglyphus lactis (Linnaeus). While eggs failed to hatch at 33% RH, the survival rates of the immature stages at ≥ 53% RH increased solely in response to water availability and not due to changes in RH. Regarding growth and development, low RH extended the egg-adult duration and pre-oviposition period. We also found that the negative effects of low RH on adult longevity and fecundity were partially or completely eliminated when drinking water was available. For the life table parameters, the highest values of net reproductive rate (R 0) and intrinsic rate of natural increase (r) were achieved at the highest RH when drinking water was availabile. Overall, water availability mitigated the negative effect of low RH on female reproduction, and female development was more sensitive to water availability than male development. Lastly, a comparison of similar research on A. swirskii suggested that water availability and RH are more in uential on r than food source or temperature.

show abstract

Section: Life Table Parameters and Sex Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of relative humidity and water availability on the life history of the predatory mite Amblyseius swirskii

2021

View full text Add to dashboard Cite

show abstract

“…For example, RH levels around the leaf layer (within 0.5-5.0 mm) are slightly higher than ambient due to leaf transpiration (Shipp et al 2009). Finally, to predict the suitability of this mite for augmentative release in a particular field or greenhouse (Shimoda et al 2019), future experiments should investigate the effects of changes in temperature, RH and photoperiod throughout the entire growing season of the host plants. 1 Same letters indicate no significant differences in multiple comparisons for the interaction between sexes and water availability for egg-adult stage.…”

Section: Rh Water Availability and Intrinsic Rate Of Increase (R)mentioning

confidence: 99%

“…However, water conservation is a major challenge due to their small size (0.2-0.5 mm in length); predatory mites lose water during respiration, by diffusion across the surface of the body and through the secretion of digestive fluids and reproductive products as well as during oviposition and excretion (Arlian and Veselica 1979). Therefore, the successful release and colonization of predatory mites may be influenced by the RH of the target area (Fatnassi et al 2015;Shimoda et al 2019). Species and strains of predatory mites that originate from different geographical regions exhibit varying responses to RH.…”

Section: Introductionmentioning

confidence: 99%

Impact of relative humidity and water availability on the life history of the predatory mite Amblyseius swirskii

San

Tuda

Takagi

2021

Preprint

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The predatory mite Amblyseius swirskii (Athias-Henriot) (Acari: Phytoseiidae) is currently used as an efficient biological control agent of thrips, whiteflies and spider mites, which are economically damaging pests of ornamental plants and vegetable crops grown in greenhouses and fields worldwide. Currently, the effects of relative humidity (RH) and water availability on the optimal growth of A. swirskii are unknown. Here, we test the combined effects of different levels of RH (33%, 53%, 73% and 92%) and water availability on the development and reproduction of male and female A. swirskii feeding on the dried fruit mite, Carpoglyphus lactis (Linnaeus). While eggs failed to hatch at 33% RH, the survival rates of the immature stages at ≥ 53% RH increased solely in response to water availability and not due to changes in RH. Regarding growth and development, low RH extended the egg–adult duration and pre-oviposition period. We also found that the negative effects of low RH on adult longevity and fecundity were partially or completely eliminated when drinking water was available. For the life table parameters, the highest values of net reproductive rate (R0) and intrinsic rate of natural increase (r) were achieved at the highest RH when drinking water was available. Overall, water availability mitigated the negative effect of low RH on female reproduction, and female development was more sensitive to water availability than male development. Lastly, a comparison of similar research on A. swirskii suggested that water availability and RH are more influential on r than food source or temperature.

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“…The slow-release sachets ensure better colonization and installation of the predator in the crop, which is key for successful biological control [ 8 , 9 ]. These sachets release a large number of predatory mites over a sustained period [ 10 ] over several weeks [ 6 ]. They consist of a sachet with water-repellent walls and an outlet opening.…”

Section: Introductionmentioning

confidence: 99%

Effect of Relative Humidity on the Population Dynamics of the Predator Amblyseius swirskii and Its Prey Carpoglyphus lactis in the Context of Slow-Release Sachets for Use in Biological Control in Greenhouses

Rojas

Gallego

Gámez

et al. 2022

Plants

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Amblyseius swirskii is a predatory mite that is widely used for biological control in greenhouses. One way this predator is released is in a formulation in slow-release sachets. These sachets are prepared with the predatory mite, the factitious prey mite Carpoglyphus lactis, and a food substrate for the latter. The objective of the present study was to study the effects of microclimatic conditions in this type of formulation on the population dynamics of mites inside the sachets and on the release of predatory mites. These experiments were conducted under laboratory conditions in two trials. The ambient relative humidity affected the water content of the food substrate of the prey mite inside the sachets, with an initial value of 21.49 ± 0.42%, which was reduced to values of 4.7 ± 0.25%, 10.87 ± 1.03% and 17.27 ± 0.82% after 21 days of trials when they were exposed to low, medium and high ambient relative humidity levels, respectively. Relative humidity significantly altered the dynamics of the populations of both species inside the sachets and the exits of the predator from the sachets to the external environment.

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Moisturized sheltered sachets are potentially useful for the efficient release of selected predators in a wide range of humidity environments

Cited by 8 publications

References 42 publications

Impact of relative humidity and water availability on the life history of the predatory mite Amblyseius swirskii

Impact of relative humidity and water availability on the life history of the predatory mite Amblyseius swirskii

Impact of relative humidity and water availability on the life history of the predatory mite Amblyseius swirskii

Effect of Relative Humidity on the Population Dynamics of the Predator Amblyseius swirskii and Its Prey Carpoglyphus lactis in the Context of Slow-Release Sachets for Use in Biological Control in Greenhouses

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