more... > Parishes > St. Mary Parish > Horticulture > For more information on these and other horticultural topics, call the St. Mary Extension office at 337-828-4100 ext. 300 or come by the Courthouse Building, 500 Main Street, Room 314 in Franklin, LA. 500 Main St · Franklin, LA · 70538 - 6199 Phone: (337) 828-4100 · Fax: (337) 828-0616 Horticulture Publication Links Sample posting of links to key Horticulture Publications. Plant Disease Management Guide [Image: plant disease guide] This guide for 2010 contains suggestions for management of the most important or more prevalent diseases of Louisiana plants. It includes information on fungicides, bactericides and nematicides, as well as safety precautions for using them.