- 著者
- 小澤 朗人 内山 徹
- 出版者
- 関東東山病害虫研究会
- 雑誌
- 関東東山病害虫研究会報 (ISSN:13471899)
- 巻号頁・発行日
- vol.2019, no.66, pp.100-105, 2019-12-01 (Released:2021-03-23)
- 参考文献数
- 21
From March 2016 to March 2017, we investigated seasonal population dynamics of the exotic predatory mite, Phytoseiulus persimilis estimated to have colonized tea fields in Shizuoka Prefecture, Japan. Species of phytoseiid mites in the tea field investigated were P. persimilis, and native species: Amblyseius eharai, A. obtuserellus, Neoseiulus womersleyi, and Euseius sojaensis. The percentage of P. persimilis in the species composition were 5.6% (2 Jul.) and 26.0% (6 Sept.). P. persimilis adults with eggs were found on 23 Mar for the first time. The two peaks of occurrences were observed on 25 Apr. three weeks after the peak of Tetranychus kanzawai, and on 23 Aug. two weeks after the peak of T. kanzawai. P. persimilis was not observed after the middle of Sept.. Primary dominant species of native phytoseiid mites was A. eharai, they occurred during most of the seasons. The peaks of native phytoseiid mites were observed on 24 May and 9 Sept., after the peaks of P. persimilis. Indices of ω proposed by Iwao (1977) which indicates a special association between two species were calculated among T. kanzawai, P. persimilis and Amblyseius spp. The indices between T. kanzawai and P. persimilis changed plus (coexistence distribution) to minus (exclusion distribution) around Apr. - May. These results suggest that P. persimilis strongly depends on T. kanzawai, while P. persimils does not significantly affect the populations of native phytoseiid mites in tea fields.
- 著者
- 小澤 朗人 内山 徹 亀山 阿由子
- 出版者
- 関西病虫害研究会
- 雑誌
- 関西病虫害研究会報 (ISSN:03871002)
- 巻号頁・発行日
- vol.60, pp.113-116, 2018-05-31 (Released:2018-09-01)
- 参考文献数
- 11
We estimated the density of shoot blight from Pestalotiopsis longiseta and rolled leaves produced by Adoxophyes honmai or Homona magnanima in tea fields using a direct counting method based on aerial photography from a multirotor-type drone. We used a DJI Phantom 4 to conduct aerial photography of shoot blight and rolled leaves. We then counted the densities of both the diseased and rolled leaves in-situ. We examined the aerial photographs on a LCD, and identified and counted the densities of both the diseased and rolled leaves. The relationship between the densities of shoot blight counted using the LCD and in-situ was R2 = 0.69 and 0.76, respectively. The accuracy of estimation using the LCD was about 80%. These results suggested that estimation of the density of shoot blight based on aerial photography was effective. For the rolled leaves, the accuracy of counting using an LCD increased to about 60% from <40%, after comparing to the first count.
1 0 0 0 OA チャノコカクモンハマキ(チョウ目:ハマキガ科)におけるジアミド系殺虫剤抵抗性の遺伝様式
- 著者
- 内山 徹 小澤 朗人
- 出版者
- 日本応用動物昆虫学会
- 雑誌
- 日本応用動物昆虫学会誌 (ISSN:00214914)
- 巻号頁・発行日
- vol.61, no.2, pp.109-117, 2017-05-25 (Released:2017-06-18)
- 参考文献数
- 45
- 被引用文献数
- 5
We investigated the inheritance of resistance to diamide insecticides, flubendiamide, and chlorantraniliprole in the smaller tea tortrix, Adoxophyes honmai Yasuda, using resistant(R)and susceptible(S)strains obtained from Shizuoka Prefecture, Japan. Lethal concentration 50(LC50)values for flubendiamide in the R and S strains were 129 and 3.26 ppm, respectively. LC50 values for chlorantraniliprole in the R and S strains were 48.2 and 1.33 ppm, respectively. The results of crossing experiments showed that resistance to the two diamides was an autosomal incompletely dominant trait controlled by polygenic factors.
- 著者
- 米山 千温 内山 徹
- 出版者
- 日本植物病理学会
- 雑誌
- 日本植物病理學會報 (ISSN:00319473)
- 巻号頁・発行日
- vol.73, no.3, 2007-08-25
