Multiple choice Which of the following matches of disease : causative agent is incorrect? Downy mildew of crucifers : Peronospora parasitica Black rust of wheat : Puccinia graminis Loose smut of wheat : Ustilago tritici Early blight of potato : Phytophthora infestans Red rot of sugarcane : Colletotricum falcatum Reveal answer Fill a bubble to check yourself D Correct answer Explanation Early blight of potato is caused by Alternaria solani. Late blight of potato is caused by Phytophthora infestans.