著者

Kandai Yoshida Shunsuke Asano Yuka Sumikawa

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.61, pp.79-84, 2019-05-31 (Released:2019-09-01)

参考文献数

11

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In 2017, chrysanthemum downy mildew, which has not been reported in Japan since 1980, severely affected chrysanthemum production in Nara Prefecture, Japan. We investigated the occurrence of the disease at the fields in Nara Prefecture and the control efficacy of thermotherapy and fungicides against it. In the field survey, over 95 % of plants were diseased in seven cultivars, while no plants with the symptoms were observed in the other six cultivars. This suggests that some chrysanthemum cultivars had resistance to downy mildew. Chrysanthemum cuttings were treated with thermotherapy (treatment with hot water and hot air). The disease prevalence in both treatments was significantly lower than that in the non-treated. Severely diseased plants were sprayed with three fungicides (azoxystrobin, manzeb, and tolfenpyrad). While azoxystrobin and manzeb reduced the disease severity compared with non-treated, its efficacy was not so high. We concluded that the use of resistant cultivars and the application of thermotherapy can effectively control chrysanthemum downy mildew.

著者

Shunsuke Asano Yoshihiko Hirayama Isao Takenaka Terufumi Naka

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.61, pp.69-74, 2019-05-31 (Released:2019-09-01)

参考文献数

21

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Spotted wilt disease caused by Tomato spotted wilt virus (TSWV) is one of the most important diseases affecting the production of bulbs and cut flowers of Dahlia variabilis in Japan. In Nara Prefecture, the main vector species of TSWV were thrips Frankliniella intonsa and Frankliniella occidentalis. The number of F. intonsa and F. occidentalis captured using blue sticky traps increased in late June and mid-May, and peaked in early July and late May to early June, respectively. TSWV viruliferous F. intonsa and F. occidentalis occurred throughout almost the entire production period in bulb production fields. TSWV might be transmitted by thrips, and the infection rates in dahlias reached up to 80% in a cut flower field. However, the use of insect proof nets greatly decreased the infection rates. In addition, the removal of dahlias with TSWV symptoms effectively decreased the rates of diseased plants. To prevent the spread of TSWV, it is important to prevent invasion of thrips using physical barriers. In addition, removal of the source of infection is an effective way to reduce the occurrence of disease.

著者

黒田 克利 鈴木 啓史 田口 裕美

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.54, pp.109-110, 2012 (Released:2012-09-01)

参考文献数

3

著者

太田 泉 本多 健一郎

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.53, pp.107-109, 2011 (Released:2011-09-01)

参考文献数

8

被引用文献数

1 1

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Sitobion akebiae is a promising alternative host aphid using a banker-plant system of Aphidius gifuensis. This study was conducted to evaluate the effect of host plant species and varieties on population growth of S. akebiae. Barley, wheat, oats and rye were tested in this study. The population increase of S. akebiae were lower on seedlings of the barley variety ‘Shunrai’ than other plants. But S. akebiae successfully increased on the matured plants with ears of ‘Shunrai’. These results suggest that young seedlings of the barley ‘Shunrai’ should be useless for host plants of S. akebiae.

著者

井村 岳男

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.53, pp.1-6, 2011 (Released:2011-09-01)

参考文献数

7

被引用文献数

1 1

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イチゴハナゾウムシによる春期の蕾被害の発生状況を,奈良県の促成イチゴ栽培施設とその周辺の野生寄主植物において調査した。越冬成虫は3月下旬から4月上旬に活動を開始し,まず野生寄主のクサイチゴを加害した。その2週間後の4月上旬から中旬に施設内のイチゴへの加害が始まった。4月中旬から下旬にノイバラの着蕾が始まるとこれも加害し,異なる寄主植物を着蕾時期に応じて順次利用していた。施設内のイチゴにおける幼虫発生時期は,野外のクサイチゴよりも早かった。また,イチゴにおける蛹の初確認時期から,第1世代成虫の発生時期は少なくとも4月下旬から5月上旬か,それよりも早いと推定された。イチゴにおける被害密度は年次間差が大きかったが,その原因は不明だった。本種成虫に対する殺虫剤の効果を簡易な室内試験で調査したところ,マラソン乳剤とチアクロプリド水和剤,スピノサド水和剤の効果が高かった。

著者

土井 誠 加藤 光弘 斉藤 千温

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.53, pp.131-132, 2011 (Released:2011-09-01)

参考文献数

7

被引用文献数

2 2 2

著者

西東 力 杉山 泰昭 芳賀 一 杉山 恵太郎

出版者

The Kansai Plant Protection Society

雑誌

関西病虫害研究会報 (ISSN:03871002)

巻号頁・発行日

vol.52, pp.135-137, 2010 (Released:2010-09-06)

参考文献数

8

被引用文献数

1 1