Pests and diseases in agriculture Topics: Plant and Tree Health The following pests and diseases may be mostly (but not exclusively) found in agriculture. More in this topic Farmers and growers - pests and diseases to look out for Potato spindle tuber viroid (PSTVd) Ring Rot and Brown Rot Potato Cyst Nematode (PCN) Potato Flea Beetle (Epitrix spp.) Blackleg of potato (Dickeya solani) Ring rot of potatoes (C. michiganensis)