An STD could save your (chest)nuts (opens in new tab)

The process of giving a fungus an STD (on purpose) to save your chest(nuts) works like this: (1) you have a tree dying from chestnut blight; (2) you introduce a second strain of chestnut blight that carries the STD; (3) the two fungal strains engage in…ahem ... parasexual behaviour in the tree, passing on the STD; (4) the original chestnut blight fungus is weakened by the STD, giving the tree a chance to fight back.