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دراسة لمرض لفحة سعف النخيل المتسبب عن الفطر Diplodia phoenicum وبعض الفطريات المرافقة له وامكانية مكافحة المرض كيميائيا واحيائيا == A study of date palm leaflets blight caused by Diplodia phoenicum and some fungi associated with it and the ability of it?s chemical and biological control
Author name:
ضرغام صباح لفتة باقر العوفي
Supervisor name:
محمد عامر فياض | يحيى عاشور صالح
General topic:
Agricultural sciences
Specific topic:
Plant - Prevention
Degree:
Master
University:
University Of Basrah - Faculty Of Agriculture - Department Of Plant Protection
Language:
Arabic
University location:
Basrah
First pages:
31T1817 - p.pdf
Abstract:
This study was carried out at the laboratories of plant protection Department - College of Agriculture - Basrah university for a.peroid during 1/9/2014 - 27/7/2015 . The study aimed to detect the leaflet bligh disease for different datepalm cultivars such as Chipchap ,Sayer , Zehdi and Khodrawi at three regoins, Medainah , Abu Al - khaseeb and Nashwa.The result showed that the infection percent was 86.51, 83.61 and 76.03% at Medainah , Abu Al - khaseeb and Nashwa respectively . The results also showed that the infection intensity was 25.96 , 23.56 and 21.1 % for the three above regoins respectively .The higher infection intensity was noticed on Chipchap culture which was 30% while the lowest one found on Sayer culture which was 23.3% .The infection intensity also differs according to surfaces , it was 76.37 % on the lower surface , while it was 55.55 , 37.91 and 24.34% on the middle ,foot and terminal of leaflet .Leaflet dried and oval pustules which contain the spores of serenomyces phoenicis were recorded as symptoms represented the scorch disease while the other fungi caused yellowish and spotting symptoms sixteen species belonging to 13 genera were isolated from the leaflets , these species were as follows : Chaetomium atrobrunneum , C.globosum , Chalaropsis thielavioides , C.radicicola ,Stemphylium.sp.,Bipolaris australis ,Cladosporium herbarum , Nigrospora sphaerica , Diplodia phoenicis , Phoma glomerata , Fusarium verticillioides , Alternaria alternate ,bA. longipes ,Coniochaete sacchareo , Melanospora sp., andS.phoenicis.Most of of them caused blight disease .Among of them D. phoenicis and S. phoenicis gave scorch symptoms pathogenicity testing .The study epplained that Extract agare was the best medium for A. phoenicis growth ;it was 7 cm , while PCA gave the lowest growth, the fungus growth , the best growth 6.83 cm was noticed on 25 c while the growth stopped on 35 c . PH also effected on the fungus radial growth , it was 4.35 cm at PH4 , while it was 6.57 cm at PH 8 .Tested fungicides revealed significant differences . Dazim and Revus Top inhibited the radial growth in a percent of 100% ,while it reduced to 83.34% with the fungicides Hunter , so Dithane M4S inhibited the radial growth to 54.22% . The biological agent Trichoderma harzianum antagonists with D. phoenicis in the alevel 1,P. fluorescence also inhibited D. phoenicis in a percent OF 100%.The field experiment revealed that pa fluorescence reduced infection intensity to 50% , while Dazim biological agent T. harzianum treatment were the lowest treatment in reducing the infection intensity which reduced to 4.1 and 6.3 respectively .
