Warm Region Horticulture Institute

Tateyama, Japan

Warm Region Horticulture Institute

Tateyama, Japan
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Ohtani T.,Warm Region Horticulture Institute | Mihira T.,Warm Region Horticulture Institute | Mihira T.,Chiba Prefectural Agriculture and Forestry Research Center | Kawana T.,Warm Region Horticulture Institute | And 2 more authors.
Applied Entomology and Zoology | Year: 2017

The abundance of the adult brown-winged green bug, Plautia stali Scott, varies annually. During outbreaks, P. stali causes severe damage to various fruit crops. Therefore, predicting its abundance beforehand is important. In this study, we constructed multiple regression models to predict the abundance of overwintered adult P. stali in Chiba Prefecture, Japan, by using the accumulated aggregation-pheromone-trap captures of P. stali and the male flower production of sugi Cryptomeria japonica (Thunb. ex L.f.) D. Don, which relates to cone production, from 1998 to 2016. The abundance of overwintered adults in the present year can be predicted by male C. japonica flower production and the abundance of P. stali adults in the previous year. The models are highly precise and can calculate estimates in August for the abundance in the next year, which is far enough in advance for the application of control measures. These models also indicate intraspecific competition for food resources in P. stali. © 2017, The Japanese Society of Applied Entomology and Zoology.


Usami T.,Chiba University | Matsubara C.,Chiba University | Kanegae Y.,Warm Region Horticulture Institute | Ebihara Y.,Warm Region Horticulture Institute
Journal of General Plant Pathology | Year: 2015

Unknown spot diseases were observed on calla lily leaves and spathes in Japan. Fungi isolated from spots were identified as Plectosphaerella sp. based on morphological characteristics. Inoculation and reisolation confirmed the pathogenicity of the fungi on calla lily. The fungi were distinct from known species of Plectosphaerella in terms of rDNA nucleotide sequences, growth rate, and specific pathogenicity on Zantedeschia species. This report is the first in the world literature of a spot disease of calla lily caused by Plectosphaerella sp. Management of this pathogen is important for calla lily cultivation because it degrades spathes having high commercial value. © 2015, The Phytopathological Society of Japan and Springer Japan.


Kurose D.,Japan National Institute for Agro - Environmental Sciences | Kanegae Y.,Warm Region Horticulture Institute | Misawa T.,Hokkaido Research Organization | Ebihara Y.,Warm Region Horticulture Institute | And 5 more authors.
Journal of General Plant Pathology | Year: 2015

Yellow spots on leaves of white lace flower, Ammi majus, were found in Chiba Prefecture, Japan, in October 2006. The symptoms later developed into large brown spots. Brown lesions were also observed on the lower stem, and stem rot followed. A fungus was frequently isolated from the lesions, and the symptoms were reproduced after artificial inoculation. The causal fungus was identified as Pleospora herbarum based on morphology and molecular analysis. We named the new disease “yellow spot” (“ouhan-byo” in Japanese). © 2015, The Phytopathological Society of Japan and Springer Japan.

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