FIRST RECORD OF ALTERNARIA RADICINA MEIER, DRECHSLER AND   EDDY AS A CAUSAL AGENT OF THE  LEAF BLACK SPOT DISEASE ON DATE PALM IN BASRAH CITY AND ITS BIOLOGICAL CONTROL

N. Ahmed, Alaa

doi:10.33762/bagrs.2011.57208

	FIRST RECORD OF ALTERNARIA RADICINA MEIER, DRECHSLER AND EDDY AS A CAUSAL AGENT OF THE LEAF BLACK SPOT DISEASE ON DATE PALM IN BASRAH CITY AND ITS BIOLOGICAL CONTROL
Basrah Journal of Agricultural Sciences
Article 4, Volume 24, Issue 2, 2011, Pages 48-66 PDF (0 K)
DOI: 10.33762/bagrs.2011.57208
Author
Alaa N. Ahmed
Abstract
This study was carried out during the growing season 2010 in the laboratories of the Date Palms Research Center at the University of Basrah.The results showed that the isolated and diagnosis the fungus Alternaria radicina was considered as first record as a causal agent of leaf black spot disease on the date palm in Basrah city, It was evident that A.radicina gives leaf black spot symptoms of date palm leaves when its pathogencity was tested in laboratory, this fungus gave leaf black spot symptoms and brown color intra at the infection tissue . The study indicated that A.radicina has an ability to infect different cultivars of date palm . Zahdy and Sayer cultivar revealed highest rate of infection reached to 3.4 and 3.1cm respectively compared to Preim and Barhee which reached to 1.9 and 2.0 cm respectively. It was found that A.radicina gave abest growth at temperature of 30 ºC . The study also explained that A.radicina has an ability to produse enzymes such as cellulase and phenol oxidase . This study results showed was that biofungus Trichoderma harzianum has an ability to inhibit the growth of A.radicina which reached to 63.88 % and the optimal temperature to inhibit the growth of A.radicina was 40ºC which inhibited the radial growth in a percent of 100 % , which the lowest inhibition of the growth reached to 6.66 % in 10ºC .

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