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Subject:  Black curling leaves

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Big T Hoff

Hadley Ny

I posted a pic in my diary. Was wondering what was making the leaves curl and turn black on the end of main and on farthest out secondaries. Grown right next to others and I have no issues. Didn't do anything different with this plant. No problems yesterday and all I did was water bases yesterday. Hot and humid but I only hit 86 yesterday. Any help would be appreciated.

7/2/2018 8:17:24 AM



Sunscald. Did you have some higher temperatures or higher intensity sunshine the day when that happened? Usually this sunscald happens on the 3rd and 4th leaf (counting from the vine tip´s 1st leaf which just spreads open), because the smaller leaves still have a rather high density of fine hair which protects them from the sun, and the older leaves aren´t growing so fast and have already developed their water supply system, and that´s (as far as I can guess) why the 3rd/4th leaf are the most vulneralbe ones, loss of their dense hairy coat + fast growth of thin leaf surface + rather weak water supply in order to cool the quickly growing (and in the sun quickly heating up) leaf surface.

7/2/2018 9:02:37 AM



Some plants are more vulnerable than others, I´ve had some plants develop that kind of sunscald on almost all vines whereas other plants didn´t show any signs of weakness.

7/2/2018 9:04:30 AM

andy W

Western NY

Sunburn. Lost a ton of new growth here the last 2 days. Probably losing a bunch more the next few days.

7/2/2018 9:14:35 AM

DJW (Dan)

New Berlin, PA

Yes, definitely sun scald. I'm trying a strip of material propped up on bamboo stakes that shades all my vine tips/new growth. Hoping it helps ease the scald a bit during these days in the high 90's

7/2/2018 9:20:04 AM

Big T Hoff

Hadley Ny

What gets me is I have 8 other plants in this same patch and this is the only one it happened to. Andy and Dan had to have had mid 90s or higher but sunburn is sunburn. How will this affect the kins I was going to pollinate in a few days and the plant itself. Hot all week. I was warned by Brian that this might happen to my 1561 Reeb and it didn't and it's growing right next to it. The plant is the 555 Grande 359 x 2009. Genetics?? Cut it off and rip it out of the garden?? lol sorry Wiz couldn't help myself. Out of the 75-80 plants that I've had in my 3 years growing this is the first time this has happened but then again I only broke 80 degrees here 4 times last year. Thanks guys!

7/2/2018 9:42:29 AM


Jericho Vermont

I have seen that here many times. I usually help the burning of the leaves with merit and talstar as well. LOL Seeing it is Wizzy's plant I would pull it.
The few burned leaves will not hurt overall growth too much in my opinion but in these hot days if the plants flag to much they seem to like to abort babies.
Keep them as happy as possible.

7/2/2018 9:56:05 AM

Big T Hoff

Hadley Ny

Went back and did a closer inspection on my other plants and did find a leaf or two curled and black on a couple plants. Broke out some chairs for shade on babys on the tips where leaves weren't covering. John didn't you suggest the other day that I put merit and talstar on Wizzys plant!!

7/2/2018 10:08:28 AM

Porkchop(team sLamMer)

Mohawk valley ny

Were trying porch screen stretched over the vine tips...it’s helping...freekin hot out here...

7/2/2018 11:02:46 AM

ESheel31(team sLamMer)

Eastern Shore of VA

This is the cantaloupe issue I posted about one post below this one.
Do the leaves have a residue on the bottom side of the burned spots ?

7/2/2018 11:37:20 AM

Big T Hoff

Hadley Ny

ESheel It is probably water that should be going to the leaf. I'm guessing but it makes sense. To hot to go out and check!!! Porkchop..I'm glad I'm in the Adirondacks and not in the Mohawk Valley. Happy with 86 yesterday but still had as much sun as you guys did. Also Nine plants at the Scofield farm but younger and they look fine. Funny when you get older the body can't stand what it used to...MORE BEER

7/2/2018 12:08:00 PM

Rick j.

stoughton WI

this is a very important aspect of photosynthesis. As you are probably aware, Photosynthesis is a chemical reaction that captures light energy and turns it into sugar. These sugars are then used by the plant as energy for any number of things. The process of photosynthesis requires three things: Light, Carbon dioxide and water. If any one of these things is in short supply, then photosynthesis cannot happen. When you increase the level of light, plants will photosynthesize more. But, if you have too much light, than the other 2 ingredients become limiting and photosynthesis can no longer increase with the level of light. When this occurs, leaves can experience sunburn damage. If you've ever seen a leaf with large dry brown sections on a living leaf, it is because that leaf experienced sunburn.

With too little light, photosynthesis cannot occur either and the plant suffers without the production of sugars

7/2/2018 2:32:34 PM

Total Posts: 12 Current Server Time: 2/17/2019 8:56:00 PM
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