- 著者
- 土田 祐大 増井 伸一
- 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.65, no.2, pp.99-108, 2021-05-25 (Released:2021-06-10)
- 参考文献数
- 46
- 被引用文献数
- 4
Five phytoseiid mite species: Phytoseiulus persimilis Athias-Henriot, Neoseiulus californicus(McGregor), Neoseiulus womersleyi(Schicha), Amblyseius eharai Amitai and Swirski, and Euseius sojaensis(Ehara)(Acari: Phytoseiidae)were collected from commercial Japanese pear orchards in Shizuoka Prefecture. To evaluate the suppressive effect of generalist phytoseiid species on the spider mite Tetranychus kanzawai Kishida(Acari: Tetranychidae), we compared four treatments(E. sojaensis release, A. eharai release, synthetic pyrethroid application, and no-release)performed in a greenhouse. These treatments were conducted when T. kanzawai densities were low, and pine pollen was provided as alternative food for predatory mites in all treatments. At late June, the peak densities of T. kanzawai were significantly low in E. sojaensis release and in no-release compared with in pyrethroid application and in A. eharai release. The dominant phytoseiid species in E. sojaensis release and in no release was E. sojaensis. After July, however, E. sojaensis densities became lower in E. sojaensis release as well as no-release, and thus T. kanzawai densities became higher in all treatments at early August. These results suggest that conservation and augmentative release of E. sojaensis prior to T. kanzawai population increase, might suppress the outbreak of this spider mite in Japanese pear orchards until early summer.
- 著者
- 増井 伸一
- 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.62, no.2, pp.107-114, 2018-05-25 (Released:2018-07-10)
- 参考文献数
- 38
- 被引用文献数
- 3 5
I investigated the impact of insecticide application on the population density of Panonychus citri(McGregor)in two citrus orchards in Shizuoka Prefecture with different species of mite predators. In one citrus orchard, Neoseiulus californicus(McGregor)was the main mite predator species. The application of tolfenpyrad reduced the density of N. californicus and resulted in an increase of P. citri, whereas the application of imidacloprid or chlorfenapyr did not affect the densities of N. californicus and P. citri. In the other citrus orchard, Stethorus spp. were the main mite predator. The application of imidacloprid reduced the density of the predators and increased the density of P. citri, whereas the application of chlorfenapyr did not affect the density of P. citri and the predators. The application of tolfenpyrad reduced the density of the predators, but P. citri did not increase. These results demonstrate that biological control of P. citri requires careful selection of insecticides that will not have a detrimental effect on the region-specific species of mite predators in citrus orchards.
- 著者
- 片井 祐介 石川 隆輔 土井 誠 増井 伸一
- 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.59, no.1, pp.1-6, 2015
- 被引用文献数
- 13
温室メロン栽培の重要害虫であるミナミキイロアザミウマに対して,メロンの播種直後からLED電球による赤色光(波長620-630nm)を1×10 18photons・m-2・s-1の光強度で照射したところ,成幼虫数は24時間連続照射区および昼間12時間照射区で無照射区と比較して有意に少なかった。また,ガラス温室において定植後のメロン株に赤色光(同上)を光強度4.7×10 18photons・m-2・s-1の光強度で照射したところ,成幼虫数は赤色照射区が無照射区より有意に少なかった。また,ビニールハウスにおいて定植後のメロン株に赤色光(同上)を1×10 18photons・m-2・s-1で照射したところ,成幼虫数は赤色照射区が無照射区より有意に少なかった。これらのことから,温室メロン栽培において,赤色LED光の照射はミナミキイロアザミウマの防除に有効であると考えられた。