Blight
Blight is a disease that infects plants. Blighted crops will not grow or yield anything when harvested, and can spread the blight to other nearby plants while losing health points and dying.
Deterrence
To stop blight, the affected plants need to be manually selected for cutting (using the plant cut command), or burned with Molotov cocktails or Incendiary launchers, though burning the plants may be inaccurate and kill plants that are not blighted. The advised method to deal with a blight outbreak is to set up a plant cutting order for all blighted plants and quickly set plant cutting to priority 1 for everybody. Once the blight has been dealt with, reset the priorities.
The blight starts at 10% severity, on 20% of your plants (40% initial plants affected has been witnessed in December of 2020). It will progress slowly once plants are infected, and once it reaches 28% it can spread to nearby plants within a 4-tile radius.
Affected Plants
Devilstrand mushrooms, cocoa trees, trees or any other plants with a 15-day or longer growing period are immune to blight.