Multiple choice The causative fungal agent for ‘Halo spot’ disease in barley is Pyrenophora teres f. teres Rhynchosporium secalis Blumeria graminis f. sp. hordei Puccinia hordei Pseudoseptoria stomaticola Reveal answer Fill a bubble to check yourself E Correct answer Explanation In Barley, white to tan, small, semi-rectangular spots or blotches with a dark brown edge aligned along the veins of the leaf blade is known as Halo spot disease. The causative fungus of the said disease is Pseudoseptoria stomaticola.