福岡県農業総合試験場研究報告

ブドウ黒とう病および枝膨病に対する休眠期防除を省いた防除体系の有効性

[摘要]ブドウ‘巨峰’の主要病害である黒とう病および枝膨病に対して、新規の生育期防除剤の有効性を検討するとともに、休眠期防除を省いた防除体系による発病抑制効果について検討した。その結果、休眠期防除を実施しなくても、展葉2～3枚期（4月中～下旬）にジチアノンフロアブル、展葉6～8枚期（5月上～中旬）に有機銅フロアブルおよび落花直後（5月下旬）にクレソキシムメチルドライフロアブルを散布することで、黒とう病および枝膨病に対して高い防除効果が得られた。このことから、本防除体系を実施すれば、休眠期防除を省いた体系でも両病害に対する防除は可能であると考えられる。

［キーワード：ブドウ、黒とう病、枝膨病、薬剤防除、休眠期防除］

　Comparison of Fungicide Efficacy against Anthracnose and Swelling Arm of Grapevine with or without Dormant Spray Applications.　KAJITANI Yuji and Yoshio OHIRA （Fukuoka Agricultural Research Center, Chikushino, Fukuoka 818-8549, Japan）Bull, Fukuoka Agric. Res. Cent., 18 : 84 - 86(1999)

　Anthracnose and swelling arm, caused by Elsinoe ampelina and Diaporthe sp. respectively, are important diseases of grapevine. Control efficacy against these diseases was compared in the tests with or without dormant spray applications of a fungicide. Despite no fungicides were applied in dormant period, high efficacy was achieved against anthracnose when grapevine was treated with the fungicide dithianon flowable between the mid and end of April(two to three leaf stage). High efficacy was also achieved against anthracnose and swelling arm when grapevine was treated with the fungicide dithianon flowable between the mid and end of April(two to three leaf stage), and oxine copper flowable from the early to mid of May(six to eight leaf stage) followed by the application with kresoxim-methyl dry flowable in the end of May just after flower abscission.