Blight

Area 
Causes the plants within the affected area to grow more slowly and more 
weakly for the rest of their growing season. The crop yield within the area 
is halved. Immediate effects include loss of leaves, fruit, and blossoms; the 
affected plants recover (partially) in the following days.

Duration: One crop or growing season. 
Base cost: 1. To be affected, the plants must be entirely within the area of effect. 
Time to cast: 5 minutes. 
Prerequisite: Plant Growth.

Item 
Staff. Usable only by mages.  
Energy cost to create: 500.