plant diseases. leaf spot caused by colletotrichum species. typical symptoms, appearing as circular or ovoid, sunken, and brown

plant diseases colletotrichum species yellow halo circular ovoid sunken brown lesions leaf spot botany pest leaves round big forest bacteria virus uttarakhand india sick disease background texture summer isolated nature garden green color environment natural season botanical outdoor decay rot close unhealthy closeup diseased damaged soil toxic poison diseases caused species typical symptoms appearing halo