Close up of the vine.

The vines have a really useful systems OFF mechanism. If the red line of the physiology-cell-tissue variables, the chemical signals in the leaves, shoots and grapes begin to move. Chemicals like mammalian hormones move much slower and the message is to TURN OFF. If the season is too difficult, they will just close for the season, they will just send messages to the sheets that it is okay, it is enough for this year that we close the store, we will try again next year.

So it drops its leaves, carbohydrates seep from the shoots and leaves into the cords, the trunk and deep into the roots, especially the roots, houses its photosynthate treats and then wait, sleep endures winter in suspended animation. It collects its treats in its trunk and mainly its roots and hibernates until the next season in which it will try its luck again, the next season it is hoping for a season that could be more conducive to the growth and formation of grapes, perhaps a fruit. more fortunate. Established period, perhaps better rain, eternal hope springs from 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 give us the best indication of vine stress: the leaves are not as green as usual, they may be curled around the edges, they may have holes, and some leaves have died and have already fallen. down. Catch grape vine stress early to avoid system-wide vine shutdown.

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

Failure to take the correct corrective action triggers the vine closing sequence, so the leaves drop and the bunches of grapes also fall to the ground and your grape season has outpaced a huge investment for the year, either in dollars or in time. lost.

Heat related vine stalls.

Something to keep in mind is the effect of heat on the closing of the vine. The vines grow in spring and summer. In spring the problem will be 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 cause the vine to die off completely. The photosynthesis machinery of the leaves kicks in again when the temperature returns to the proper growth rate.

The best planned annual closures of the vine.

Do not ignore the vine after you have taken the grapes. You need to invest in the next season. The leaves still need to work as long as possible for the carbohydrates to move to the roots. Keep the water to invest as much as possible for the next season. These reserves are the starter for the first growth of the next season, creating the vegetative burst before the shoots become net providers of photosynthetic goodness.

How Grape Vines Fade When Under Stress

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