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Hamilton, MT

Does anyone have a theory on what would cause the outter rim of the larger leaves to start looking crimped or puckered?

Just wondering...

Thanks, Kim

5/27/2005 9:34:57 PM

Marion,IN

I have two leaves on a plant that looks the same. I wonder if it is because of heat stress?

5/27/2005 9:56:15 PM

Ohio

Your grow light in your hoop-house is to close to the plant maybe?. I did it to one of my leaves this way.

Brooks

5/27/2005 10:14:48 PM

Joliet, IL

i have 2 leaves that just go burnt on early a plant that is already past 10' and is out of the greenhouse. and it only got to 77 that day, but it has been cooler at night lately here in the midwest. that morning is was cloudy and cool and then whamo...direct sunlight at about noon and temps rose over 15 degrees quickly and the wind died to nothing.
also, we had heavy rains about 6 days prior so i didn't water for a while. i took those two leaves that wilted bad and got burnt a bit as a sign to water again quickly, the rest of the leaves are back to normal. my burns were on small tender developing leaves. the outside edges get a thin wilty look to them and as the leaf continues to grow it hardens up with the crimped edge look. this also happened while the plants were in the greenhouse a while back when clear skies and a rise in temps followed a cool cloudy morning. not sure if this is same scenario, but i would think its heat releated. glenn andrews just made a recent post about re-acclimating your plants after cold and cloudy sustained days and then a quick jump to warmer direct sunlight days. its a great point to use a little shade cloth or some way to help the plants avoid heat or sunburnt leafs.

5/28/2005 12:52:53 AM

Ontario, Canada.

Calcium Deficiency

Symptoms:
Calcium-deficient plants are stunted, having distorted, cupped leaves and characteristic interveinal chlorosis. Symptoms appear first on new growth.

http://aggie-horticulture.tamu.edu/cucurbit/leaf/37.1.html

5/28/2005 3:57:56 AM

Ontario, Canada.

young roots it seams can defend against excessive moisture by quickly forming a suberin layer. Blocking out the world appears to be an important characteristic. In cool damp weather or similar conditions transpiration governs the roots response by producing acid (HORMONE) concentrations in the leaves. Available Calcium in the roots is quickly rushed to the leaves to neutralize (Suppress) the hormone. The drained roots are now undersupplied of Calcium (Ca). The constricted supply chain eventually leads to the unsupplied symptomatic leaves we see that are cupped or curled and pocked with the yellow interveinal chlorosis.

5/28/2005 4:36:46 AM