Strange Fungus event

Just got the game.  Liking it overall.  However, I colonized a world that gave me the Strange Fungus event, which I recall from Galciv3.  But this time, without informing me, it imposed a 25% morale penalty on the planet.  So to my surprise, when I made it a core world, it was immediately on the brink of rebellion.  This early in the game, I don't have resources to do much of anything about the morale.  So it's a crippled, useless world.  Only two other core worlds exist in my territory.  Without this one, it'll be tough to deal with the flotillas of enemy ships already forming. Is there a way to overcome this thing?  I don't like such hammer blows coming from random settlement events.