In cases such as this, remove the growth tubes because they are trapping heat which can kill the young tissue. All first year vines should have grown out of the growth tubes my this time. Some growers feel growth tubes need to be removed in August so the young vines can harden off before the first freeze in October. Zinc deficiency has been noticed on mature vines with shallow soil or poor drainage. It can be corrected by spraying the foliage with one cup of NZN in 100 gallons of water early in the season.
Most vineyards can profit from fertilizer.
The rains have also stimulated the growth of bull shoots on some vines. They will hold back the shoots from fruiting buds, so they should be removed while they can be snapped off easily before the wood becomes hard. Usually it is only one or two shoots extremely vigorous and 10 to 20 shoots very slow growing. Pierce's disease has not been as severe on dormant wood during pruning as expected. It can be identified during pruning when vines are found to be dead.