薰衣草疫病在台灣為首次記錄。罹病植株葉片出現下垂、褪綠的現象,莖基部褐化並向上蔓延,進而造成葉片褐化,數日後,全株乾枯褐化死亡,地下部之吸收根受害後呈暗濕褐腐狀。從罹病組織分離得到疫病菌,以游走孢子懸浮液接種薰衣草,皆可使其產生與田間相同的病徵;自罹病組織上亦可再分離到相同的病原菌。本病害鑑定由Phytophthora parasitica (=Phytophthora nicotianae)(A1配對型)所引起。菌絲最適生長溫度為28°C。
A new root rot of lavender (Lavandula spp.) was found in Taiwan. Symptoms of the diseased plants were apparently rapid wilting, drying, brownish discoloration of stem and root rot. Inoculation experiments using zoospore suspensions were successful in reproducing symptoms originally observed on wilting and drying plants. The pathogen was identified as Phytophthora parasitica (= Phytophthora nicotianae) (A1mating type). The optimum temperature for mycelial growth was 28°C.