How to plan and execute a Grade 2 Bioweapons Attack.
Step 1: Identify non-pathogen organism, with potential for great economic harm, ie Locusts.
Step 2: Identify hormone that keeps said organism from swarming.
Step 3: Spray said hormone over target locations for decades.
Step 4: Identify hormone responsible for swarming behavior.
Step 5: Repeal Step 3; and spray second hormone over target area.
Step 6: Claim "Act of God", whilst enemies food crops and economies are devastated, claim virus prevents food / aid being delivered.