How Grape Vines Shut Down When Under Stress

Vine close up.

Vines has a really useful system SHUTDOWN mechanism. If the physiology-cell-tissue variables Red-Line then the chemical signals in the leaves, shoots and grapes begin to move. Chemicals like mammalian hormones move much more slowly and the message is to TURN OFF. If the season is too harsh they will just close for the season just send messages to the leaves that it is ok enough for this year we are closing shop we will try again next year

So it drops its leaves, the carbs seep away from the shoots and leaves into the cordons, the trunk and deep into the roots, especially the roots, it houses its photosynthate goodies and then it waits, it sleeps, it endures the winter in suspended animation. It collects its goodies in its trunk and mainly its roots and hibernates until the next season when it will try its luck again, the next season is hoping for a season that could be more conducive to the growth and formation of grape berries, perhaps once a luckier fruit. Established period, perhaps better rain, hope springs eternal for the possibilities of the next season.

Extreme Vine Stress and the triggering of this auto-shutdown sequence.

During the season, it is the leaves that best indicate the stress of the vine: the leaves are not as green as usual, they may be curled at the edges, they may have holes and some leaves have died and have already fallen. down. Detect grape vine stress early to prevent a system-wide vine shutdown.

So the leaves give us the best and easiest visual indication of vine stress. When you see evidence of stress in the vine, it gives us some time to take some corrective action, whether it is the need for more water (irrigation), the soil may be waterlogged, the nitrogen levels in the vine may be low, or some pest it is draining the vital force of the trunk of the vine. Either way, unhappy leaves mean it’s time to make some manipulation deductions on the grape vine.

If the correct corrective measures are not taken, the vine shutdown sequence is activated, so the leaves drop and the bunches of grapes also fall to the ground and your grape season is over. It’s been a great investment for the year, either in dollars or in time. lost.

Heat related grape vine stops.

Something to take into account is the effect of heat on the stop of the vine. The vines are growing in spring and summer. In spring the problem will be the cold, if the temperature drops below 10 degrees Celsius (50 degrees Fahrenheit) the leaves stop working at the top end above 32 degrees Celsius (90 degrees Fahrenheit) the vines also stop working. Then photosynthesis stops and the vine is under stress. Too many days in a row of heat stress can force the vine to shut down completely. The leaf’s photosynthesis machinery starts up again when the temperature returns to the proper growth range.

Vine’s best planned annual closings.

Do not ignore the vine after you have taken the grapes. You have to invest in the next season. The leaves still need to work for as long as possible for the carbohydrates to move to the roots. Continue with the water so that it invests as much as possible for the next season. These reserves are the starter for next season’s first growth: it creates the vegetative burst before the buds become net purveyors of photosynthate goodness.

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