細花野牽牛簇葉病之兔絲媒介傳染

Abstract

細花野牽牛簇葉病係作者於1977 年在臺南發現之新病害，本病病徵為花器葉化，異常分蘗叢生，小葉簇生，形成典型帚狀簇葉病徵。本病可經兎絲（Cuscuta chinensis）媒介傳染而使長春草感染罹病，並顯現花瓣葉化，小蘗叢生黃化及異常分蘗叢生之嚴重叢生型病徵，此項病徵與甘藷簇葉病在長春草顯現之輕型簇葉病徵有極顯著之差異。 The I pomoea obscura witches’ broom a newly recorded disease, was first recognized in Taiwan in 1977. The diseased plants became conspicuously stunted and showed the bushy appearance with virescence of floral organs, and the abnormal shoots grown from the crowded phylloid flowers. The disease agent could be transmitted from infected I pomoea obscura to healthy periwinkle through the bridge of the plant parasitic dodder Cuscuta chinensis Lam. The infected periwinkle developed severe yellows, little leaf and extremely bushy witches’ broom symptoms, which were distinctly diffenent from the mild symptoms on periwinkle affected by sweet potato witches’ broom.