Moisturized sheltered sachets are potentially useful for the efficient release of selected predators in a wide range of humidity environments
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Slow-release sachets of predatory mites are commercially available for controlling small pest arthropods in many crops. We recently developed plant-attached shelters containing sachets and felt patches, called “sheltered sachets”, to protect predators against pesticides and wet conditions, and enhance their release to crops. However, this release system appeared to be vulnerable to dry ambient environments. To address this problem, we developed “moisturized sheltered sachets”, containing water-absorbed polymers as a humidifier, and investigated the numbers of Neoseiulus californicus and Amblyseius swirskii released from three different release systems, at low, moderate, and high RH. Irrespective of predator species and RH (excepting A. swirskii at high RH), more predators were released from the moisturized sheltered sachets than from the sheltered sachets and/or normal sachets. Thus, moisturized sheltered sachets appear to be potentially useful for the efficient predator release in a wide range of humidity environments.
KeywordsSlow-release sachet Environmental stress Biological control Predatory mite Neoseiulus californicus Amblyseius swirskii
We gratefully acknowledge the assistance of Professor Hiroshi Amano (Graduate School of Agriculture, Kyoto University, Kyoto, Japan) and Mr. Takeshi Ohya (Kanagawa Agricultural Technology Center, Hiratsuka, Kanagawa, Japan) for valuable comments on this study. We also thank Ms. Sayuki Yamada, Yumiko Togashi and Yoshiko Ishimura for helping us to conduct some of the experiments. This research part of our project [called the Itsudemo-Tenteki (Banker-Sheet) Project in Japanese] was financially supported by the Science and Technology Research Promotion Program for the Agriculture, Forestry, Fisheries And Food Industry (26070C). We are also thankful for the support of all participants in the project.
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