檬果果斑病之研究(II)病原性
Other Title
STUDIES ON MANGO FRVIT SPOT (II) PATHOGENICITY
Series/Report No.
臺灣省農業試驗所報告; 32
Start Page
62
End Page
66
Date Issued
1975-05
Date
1975-05
Author(s)
廖嘉信
C.H. Liao
Abstract
檬果果斑病為假單毛菌屬病害，其寄主範圍除檬果、介壽果外，新發現使君子亦為其寄主之一。其病做大小僅1mm以下，為能引起隆起之葉部病斑。
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。
環境因子對致病力之影，試驗顯示，在攝氏32度，相對濕度70%以上時，接種後10天之罹病舉均可達到70%以上，相對濕度90%以上時，病斑呈黑色擴散狀。光照對罹病率之影響，光照為14小時者65.9%，而10」、時者為87.4%，顯示陰天對本病原菌繁准有利。
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.
Publisher
臺灣省農業試驗所
Description
封面名稱為：臺灣省農業試驗所研究彙報第32號
Type
report
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