i would suggest you diversify your planting ... get out of the juniper world ...

you had a problem with all of one kind of juniper...

and you are replanting.. with only one different kind of juniper ...

link has all kinds of advice.. like planting resistant varieties.. is yours?? .. you dont give the full latin .. so i dont know if old and new are in the same family ..... and dont have time to look them up ...

it also say to not wet foliage.. especially in the evening ... full sun.. no overhead watering .. etc ... no fert ... no mower damage ...

ken

Here is a link that might be useful: link