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  • 期刊

康乃馨品種間葉斑病之發生及防治

Occurrence of Alternaria Leaf Spot on Various Carnation Cultivars and Its Control

摘要


Alternaria dianthi Stev. & Hall引起的康乃馨葉斑病,是本省康乃馨栽培上主要的葉部病害之一。露天栽培的康乃馨葉葉斑病發生較簡易防雨設施者為嚴重。不同康乃馨品種在田間發生葉斑病之程度存在明顯的差異,其中以紅花品種較為抗病。溫室檢定50個康乃馨品種對葉斑病菌之抗感性,僅有8個品種抗病性較高,其餘均為感病或高感病品種。將抗病品種與感病品種採單株或單行混植,則有促使抗病品種產生病害的趨勢。溫室藥劑測試選出75%四氯異苯睛(Chlorothalonil)可濕性粉劑400倍及24.9%待克利(Difenoconazole)乳劑1,000倍兩種藥劑進行田間防治試驗,結果顯示,發病前或發病初期施用此兩種藥劑均可有效防治葉斑病的發生,其中尤以待克利效果最佳,並有顯著提高切花品質與產量的效果。

並列摘要


Alternaria leaf spot caused by Alternaria dianthi Stev. & Hall was the most serious airborne disease on carnation (Dianthus caryophllus L.) in Taiwan. Carnation plants infected by the pathogen were much more severe under field conditions than under rain-proof structures. Cultivars of commercial carnation showed variable susceptibility to this disease in the field. Cultivars with red-color-flower were more resistant than others. Of 50 cultivars tested against the pathogen in the greenhouse, eight were recongnized as resistant ones. However disease severity of resistant cultivar could be increased significantly when the resistant and susceptible cultivars were planted as ”row by row” or ”plant by plant” pattern. Spraying with 75% Chlorothalonil W.P. 400 X or 24.9% Difenoconazol B.C. 1000 X before or immediately after disease occurrence was effective to control the disease in the fields and consequently resulted in significant improvement of carnation quality.

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