|Title:||洋香瓜黑點根腐病的發生與嫁接防治||Other Titles:||The occurrence of root rot/vine decline of muskmelon and its disease management by grafting||Authors:||林益昇
|Keywords:||洋香瓜黑點根腐病;寄主範圍;Monosporascus cannonballus;舌狀根靠接法;嫁接;root rot/vine decline of muskmelon;host range;Monosporascus||Issue Date:||Dec-2010||Publisher:||農業試驗所||Start page/Pages:||165-191||Source:||農業試驗所特刊第149號||Conference:||近年來我國重大作物病害之發生及其診斷、監測與防治研討會專刊||Abstract:||
Monosporascus cannonballus 在田間侵害洋香瓜引起根腐，大部份罹病植株於採收前二星期產生急速萎凋（sudden wilt）的病徵。在溫室內以土壤試管法接種法進行M. cannonballus 的接種試驗，結果顯示供試的10 種瓜類作物，包括洋香瓜、香瓜、越瓜、胡瓜、冬瓜、南瓜、西瓜、蒲瓜、絲瓜與苦瓜等，其根圈附近，皆有其子囊孢子發芽及菌絲侵入根表皮的情形。田間調查得知洋香瓜黑點根腐病菌在台灣的寄主植物有：洋香瓜、香瓜、越瓜、胡瓜、蒲瓜（作西瓜根砧）和冬瓜等。除了洋香瓜發病嚴重外，其他作物黑點根腐病僅局限在彰化縣芳苑鄉小面積或溫室內發生。另外，本病原菌僅可由罹病根組織分離得到，自同一罹病株根腐指數為0-4 各級的部位，所得病原菌分離率分別為69、82、73、40 與9%。利用舌狀根靠接法所製作的洋香瓜嫁接株，顯示以南瓜1913 當根砧之嫁接株表現優良而穩定的成效。雖然南瓜根砧會被M. cannonballus 所感染，但是根砧之根數佔整個嫁接植株根系的54%，且其根腐指數較低。在採收期嫁接株地上部雖表現暫時萎凋的特性，但尚有符合商品價值的洋香瓜果實可供收穫。
Monosporascus cannonballus caused root rot/vine decline of muskmelon. Sudden wilt of most infected plants occurred in the field at 2 weeks before harvesting. In greenhouse inoculation tests, using soil tube method, the ascospores could germinate in the rhizosphere and the hyphae penetrated into root tissues in such plants as muskmelon, Japanese cantaloupe, oriental pickling melon, cucumber, wax gourd, squash, watermelon, bottle gourd, loofah and bitter gourd. Field survey results showed that the host range of M. cannonballus included muskmelon, Japanese cantaloupe, oriental pickling melon, cucumber, wax gourd and bottle gourd as rootstock for watermelon in Taiwan. Besides the muskmelon, which was usually seriously damaged, the root rot/vine decline in other 5 cucurbit plants were limited to some locations in Fangyuan of Changhua County or in the greenhouse. In addition, this pathogen could only be isolated from infected roots. The isolation rates were low when the inoculum was taken from badly rot tissues of infected plants. Using root tissues with a root rot index in the range of 0 to 4, the isolation rates obtained were 69, 82, 73, 40 and 9%, respectively. The muskmelon tongue root inarching grafts was provided the basis for disease management of root rot/vine decline of muskmelon. In field experiments, the grafts on squash 1913 rootstock gave a stable, positive performance on disease management. Although the root system of rootstock plants was also infected by M. cannonballus, they displayed a relatively low root rot index of 1.1 and 1.6 in the two fields, respectively. There was 54% of the total root numbers found to derive from the rootstock plant. By harvest time, the grafts showed a phenomenon of temporary wilting in which the plants wilted during the day and would recover at night or in a later time under certain circumstances. A normal harvest of high quality fruit of muskmelon was possible.
|Appears in Collections:||植物病理組|
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