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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 .

international journal of phytopathology

Alternaria radicina Causing Leaf Spot Disease of Date Palm (Phoenix dactylifera L.) in Wasit (Middle of Iraq) and Its Susceptibility to Bioassay Test of Two Fungicides