Plant disease (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plant disease</span>' is the definition.<br/ ><span class="explanation-format__explanation">(blight is a kind of plant disease)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for blight that I've seen before include "Pestilence - state of decay" , "Disease that withers plants like potatoes" , "Shrivelling disease" , "Fungal disease - destructive force" , "Disease of plants etc" .)
(Other definitions for mildew that I've seen before include "Fungal disease in plants" , "Fungi growing on plants" , "Fungal plant disease" , "White coating on things exposed to damp" , "White powdery fungus" .)