VIRUS

What is a virus

• A small infectious agent
• replicates only inside living cells of other organisms
• EX:diseased animal or warped plant

How they reproduce

• The virus attaches to the bacteria
• the virus inserts its DNA into the bacteria
• takes over the cell's machinery
• reproduces itself inside cell
• the host cell is destroyed

Common symptoms

• discoloration
• curling of leaves
• fruit distortion
• bark sealing
• yellowing on veins

example in trees

• Tomato ringspot virus
• ringspots
• overall yellowing of leaves
• green ash

example in rowcrops

• soybean vein necrosis virus
• soybeans
• light yellow patches near veins
• lesions

Examples in flowering plants

• odontoglossum ringspot virus
• orchids
• plants go limp
• less frequent, shorter lasting flowers
• brown spots appear on leaves

Viruses in plants

• minor infestation
• curling of leaves
• yellow or purple discoloration

Whole field infestation

• yellow or purple discoloration
• wilting plants