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Meta-analysis of the damage suppression effect of a double-layer fruit protection bag on fruit bug injuries of loquat fruits and evaluation by explicit solution of odds ratio

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Abstract

In the cultivation of loquat (Eriobotrya japonica (Thunb.) Lindl.) in Japan, injury to fruit by fruit bugs, such as the brown-winged green bug, Plautia stali Scott (Heteroptera: Pentatomidae), is a serious problem. Bagging developing fruits with a double-layer fruit protection bag (“double bag”) prevents damage better than a single-layer bag. In 19 field trials using both types of bags from 2005 to 2015 under varying conditions of fruit bug pressure, we compared the effects of bag types on the harvest rate of saleable fruits and the suppression of injury. Meta-analysis of the relative effect of double bags gave an odds ratio of 5.57 for the harvest rate of saleable fruits, indicating the high effect of protection by double bag. Explicit solution of the odds ratio showed the effect as a function of fruit bug pressure. This method makes it possible to cost-effectively choose which bag to use according to the predicted emergence of fruit bugs each year.

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Acknowledgements

The authors would like to express gratitude to Mr. Takehiro Kato and other technical staffs for their sincere dedication to this work. This work was also supported in part by a Grant-in-Aid for Research Project for Utilizing Advanced Technologies in Agriculture, Forestry and Fisheries (1648) from the Ministry of Agriculture, Forestry and Fisheries, Japan.

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Author notes

  1. Ken Shimizu

    Present address: Chiba Prefectural Agriculture and Forestry Research Center, 808 Daizenno, Midori, Chiba, 266-0006, Japan

  2. Tosaku Mihira

    Present address: Chiba Prefectural Isumi Agriculture Office, 14 Saruine, Ohtaki, Isumi, Chiba, 298-0212, Japan

Authors and Affiliations

  1. Warm Region Horticulture Institute, Chiba Prefectural Agriculture and Forestry Research Center, 1762 Yamamoto, Tateyama, Chiba, 294-0014, Japan

    Ken Shimizu, Toshiyuki Kawana, Toru Ohtani & Tosaku Mihira

  2. Kobayashi Bag MFG. Co., Ltd, 101 Kitagata, Iida, Nagano, 395-8668, Japan

    Seiji Furukawa

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  1. Ken Shimizu
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  2. Toshiyuki Kawana
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  3. Toru Ohtani
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  4. Tosaku Mihira
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  5. Seiji Furukawa
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Correspondence to Ken Shimizu.

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Shimizu, K., Kawana, T., Ohtani, T. et al. Meta-analysis of the damage suppression effect of a double-layer fruit protection bag on fruit bug injuries of loquat fruits and evaluation by explicit solution of odds ratio. Appl Entomol Zool 54, 247–254 (2019). https://doi.org/10.1007/s13355-019-00619-z

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