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在苗圃中,橡胶苗常患由山扁豆生捧孢菌[Corynespora cassicoa(Berk ＆ Curt)]引起的叶斑病。此病在夏季病情显著,最终导致大量的叶片皱缩与落叶,病斑合并,叶片大部分干枯。落叶后的幼苗能再生新叶,感病后再次落叶。如此反复落叶抽叶,致使植株生长矮小,减少了可芽接的种苗数量。病菌为害强度取决于接种源和土壤、气候条件。本研究报道在控制条件下氮、磷、钾对叶斑病发生率的影响。
In nursery, rubber seedlings often suffer from leaf spot caused by Corynespora cassicoa (Berk & Curt). The disease in the summer significantly, eventually leading to a large number of folds and deciduous leaves, lesions merge, most of the leaves dry. After the leaves of young seedlings can regenerate new leaves, leaves again after the flu. So repeatedly deciduous leaves, resulting in short plants grow, reducing the number of seedlings can be spliced. Pathogen damage depends on the intensity of inoculation and soil, climatic conditions. This study reports the effects of nitrogen, phosphorus and potassium on leaf spot disease under controlled conditions.