Just looked up stuff about nettlehead, and indeed it is the name for a viral disease. The person who taught me (from Hop Products Australia Bushy Park Estates) always called the stunting caused by early sprouting nettlehead.
Perhaps it's a problem in Tassie and not in mainland latitudes.
But come on, some of you out there have grown them for several years. Did anyone else experience stunted first year growth: bines grow 20-30 cm in September then stop, and might perk up a bit again in December... no crop. For me Goldings, Hallertauer mittlefrueh and Tettnang were especially prone to this.
Properly grown hops will normally send 2-3 bines up a trellis and climb up at least 3m in the first year, as well as send out a few flowers. This is what mine do when cut back till mid October, and what POR often does being the weed that it is
In the right climate and latitude (Yakima valley), 1st year properly treated plants give a commercial crop.
MFS.