|Title:||檬果果斑病之研究(2)病原性||Other Titles:||STUDIES ON MANGO FRVIT SPOT (II) PATHOGENICITY||Authors:||廖嘉信
|Issue Date:||May-1975||Publisher:||臺灣省農業試驗所||Journal Issue:||32||Start page/Pages:||62-66||Source:||臺灣省農業試驗所研究彙報||Abstract:||
樣果品種間罹病性比較結果，其葉面刺傷按種罹病率均在50%以上，在51~60%者有Julian, Bararnasi及Himsagar四品種，61~70％者有Gadoeng等六品種，71~80%者有Gandem等七品種，81~90％者有Viet-nam（越南種）之等九品種，91％以上者有Singapuri, Hayden, Keitt, Bombay #1四種。
病原濃度在每公撮含1 × 10 7之細菌個數時效病力最強，而1 × 10 3以下者致病力甚弱，或不發病。
Mango fruit spot disease is caused by Pseadoesotws mangiferae-indicae which
induces deep brown stellate spots on fruits and angular, dark brown with raised spots on leaves.
The host-s of causal organism reported by Patel el at. in 1948 India, included mango (Marsgifera indica) and czshew nut (Anacardium occiden:ate) , A new host, Ringoon creeper (Qaisqulis indica) was discovered by writer, lately. The symptoms are the ame as described on mango leaves but the width is below 1 mm. along the wound. In screening varieties for susceptibility by needle prick mathod with 1 *10 3 cells/1 ml of suspension on leaves, the percentage of susceptibility was up.to 50 % on all of 30 varieties tested. There were 4 varieties namely Java, St. Julian, Baramasi and llimsagar showing susceptible percentage of 51 to 60%, 6 varieties such as Gadoeng etc. in the range of 61 to 70%, 7 varieties such as Gandem etc in the range of 71 to 80%, 9 varieties such as Vietnam etc. in the range of 81 to 90%, and 4 varieties such as Singapuri, Hayden, Keitt and Bombay No. 1 showing susceptible percentage in the range up to 91%.
The experiments on the effects of environmental factors indicated that susceptible percentage might reach up to 70 96 within 10 days after inoculation under the conditions when average temperature was 32℃ and RH was above 70%. However the susceptibility quickly fell down to 50% in 24℃ and 60 96 RH respectively. The average susceptible percentage of 65.9% was recorded in plants which received 14 hours 1000 lux light treatment/each day. Whereas, the 10 hours treatment showed 87.4% susceptibility. The trials on the influence of concentration of suspension on the susceptibility revealed a strung susceptibility if the inoculum concentration was1 x 10 7cells/1 ml. while weak or no susceptibiltty was recorded if it was 1 x 10 3 cells/1 ml, or below.
|Appears in Collections:||植物保護系|
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