Abstract
Three Alternaria radicina (Meier) Neerg isolates (A1, A2, and A3) were isolated and firstly recorded in date palm, Phoenix dactylifera L. leaves in Wasit province (middle of Iraq) and identified as the causative pathogen of black spot disease. Two fungicides (Bavistin and Tachigazole) were used in vitro to measure their ability to control this pathogen. Study results revealed that both chemical fungicides expressed high level of inhibition in fungal radial growth especially at a concentration of 100 ppm and the lowest growth was at the concentration 5 ppm among all three isolates in both two fungicides. Bavistin revealed higher inhibition rate than Tachigazole with lowest LC50 (12.21) at the isolate A3. Tachigazole treatment showed high level of variation at all concentrations.
Highlights
Date palms, Phoenix dactylifera L. are most economically important fruit trees in tropical and subtropical areas and they are growing in a large area in many countries including Iraq
The study results revealed that both used fungicides were effectively inhibited radial growth of A. radicina colonies in vitro
Alwan (2011) reported that Tachigazole inhibits Fusarium oxysporum f.and Rhizoctonia solani growth in vitro. This is the first record of A. radicina the causative pathogen of black rot on carrot and some other crops on date palm trees especially leaves in Wasit province in the middle of Iraq; It was recorded in Basrah by (Ahmed 2011)
Summary
Integrated Pest Control Research Center, Agricultural Research Directorate, Ministry of Science and Technology, Baghdad, Iraq
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