I could be wrong, but from what I understand is that Blue Tongue is more prevalent during a drought because the midges live in the mud around stagnant water holes. The mud shores of water holes are larger during a drought because the water in the pond is drying up and exposing more mud. This gives a better environment for the midges to live. The deer have to walk through the mud to get to the water and are more likely to get bit.
This is from the article.
It’s a lack of water that promotes EHD, though. The biting midges that pass on EHD thrive along waterways that have long mudlines, which is most common during drought.
