If lateral shoots develop in the axils of the trunk leaves, pop them out before their wood tissue hardens. If the trunk shoot is forcing lateral shoots at every leaf and before the top is cut off, you probably have a zinc deficiency and need to spray the vines with Zinc nitrate or NZN as soon as possible. Use one pint of liquid NZN in 100 gallons of water without an adjuvant, sticker or spreader. The zinc foliar spray should be repeated every two weeks as long as the shoots are growing or until mid August. Tie the trunk shoot to the stake every 12 inches to make sure it will be very straight when mature.
Crooked trunks tend to catch equipment and are easily torn down.
If two trunks are used, tie one left and one right. Make sure the cordon shoots originate at least six inches below the main wire. Otherwise, a 90 degree turn in the trunk will develop and this is bad because the tight turn traps carbohydrates which in turn always stimulates rapid growth of numerous shoots at the bend and few shoots grow in the middle of the cordon. In Texas or the Texas Vineyard Guide. First, if the vines are growing good, try to select two or three cordon shoots in each direction at the main wire.