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#1
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Sunburn
How quickly does sunburn show up? I seem to have scorched one CATT but
it's neighbors look fine. Just trying to push the light to far for "Mother's Favorite" I guess. Joe T Burned in Baytown |
#2
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Sunburn
in cattleya bumpy, raised, rough, discolored patches in the upper surface
epidermal tissue of a leaf show up in about 24 to 48 hours after a "burn", even longer in some cases. The mesophyll layer and underside of the leaf may not be destroyed may continue to function. It usually but not always shows up on tissue that is perpendicular to the angle of the light/heat source. You may notice that sharp lines delineating burned and non burned tissue that seem to parallel the shadow cast by nearby leaves of other things. In contrast it is possible to burn the whole plant of a phal completely "white" in just a few hours of direct sun at the right time of year here in Virginia. It is harder to burn the same tissue if the light level/heat level is increased slowly over several weeks, months and once the tissue has paled because chlorophyll reduction. I often see sudden burning in the spring since the increasing intensity of the sun gets ahead of my shade cloth application. There are other symptoms of 'burn' on different orchid's leaf tissue. Under the right conditions thin leaved oncidiums will burn flat and dead all the way through as even the mesophyll layer and lower epidermal tissue gets destroyed by the heat/light. There are many other ways to interpret your question depending on how I think about the type of burn, and the light intensity and duration you have in mind. It can happen slowly or faster depending on all kinds of variables. Got pictures for abpo? "jtill" wrote in message oups.com... How quickly does sunburn show up? I seem to have scorched one CATT but it's neighbors look fine. Just trying to push the light to far for "Mother's Favorite" I guess. Joe T Burned in Baytown |
#3
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Sunburn
Al wrote: in cattleya bumpy, raised, rough, discolored patches in the upper surface epidermal tissue of a leaf show up in about 24 to 48 hours after a "burn", even longer in some cases. The mesophyll layer and underside of the leaf may not be destroyed may continue to function. It usually but not always shows up on tissue that is perpendicular to the angle of the light/heat source. You may notice that sharp lines delineating burned and non burned tissue that seem to parallel the shadow cast by nearby leaves of other things. In contrast it is possible to burn the whole plant of a phal completely "white" in just a few hours of direct sun at the right time of year here in Virginia. It is harder to burn the same tissue if the light level/heat level is increased slowly over several weeks, months and once the tissue has paled because chlorophyll reduction. I often see sudden burning in the spring since the increasing intensity of the sun gets ahead of my shade cloth application. There are other symptoms of 'burn' on different orchid's leaf tissue. Under the right conditions thin leaved oncidiums will burn flat and dead all the way through as even the mesophyll layer and lower epidermal tissue gets destroyed by the heat/light. There are many other ways to interpret your question depending on how I think about the type of burn, and the light intensity and duration you have in mind. It can happen slowly or faster depending on all kinds of variables. Got pictures for abpo? "jtill" wrote in message oups.com... How quickly does sunburn show up? I seem to have scorched one CATT but it's neighbors look fine. Just trying to push the light to far for "Mother's Favorite" I guess. Joe T Burned in Baytown Not at the moment, as soon as my Batt. charges I will post several. Have to use my blog as abpo refuses to come to Houston. Joe T |
#4
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Sunburn
Al wrote: in cattleya bumpy, raised, rough, discolored patches in the upper surface epidermal tissue of a leaf show up in about 24 to 48 hours after a "burn", even longer in some cases. The mesophyll layer and underside of the leaf may not be destroyed may continue to function. It usually but not always shows up on tissue that is perpendicular to the angle of the light/heat source. You may notice that sharp lines delineating burned and non burned tissue that seem to parallel the shadow cast by nearby leaves of other things. In contrast it is possible to burn the whole plant of a phal completely "white" in just a few hours of direct sun at the right time of year here in Virginia. It is harder to burn the same tissue if the light level/heat level is increased slowly over several weeks, months and once the tissue has paled because chlorophyll reduction. I often see sudden burning in the spring since the increasing intensity of the sun gets ahead of my shade cloth application. There are other symptoms of 'burn' on different orchid's leaf tissue. Under the right conditions thin leaved oncidiums will burn flat and dead all the way through as even the mesophyll layer and lower epidermal tissue gets destroyed by the heat/light. There are many other ways to interpret your question depending on how I think about the type of burn, and the light intensity and duration you have in mind. It can happen slowly or faster depending on all kinds of variables. Got pictures for abpo? "jtill" wrote in message oups.com... How quickly does sunburn show up? I seem to have scorched one CATT but it's neighbors look fine. Just trying to push the light to far for "Mother's Favorite" I guess. Joe T Burned in Baytown This should show the scorched CATT although I am having startup problems with this Blog. http://joerex99z.blogspot.com/2006_0...z_archive.html Joe T Baytown |
#5
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Sunburn
Yes that's sun/heat burn for sure. You can even see the line where shade
from the upper leaf protected some of the tissue from burning. You can see a less severe burn on adjacent leaves which are on the same plane in relationship to the light source. Temperature on a hot day can contribute to the burn; where on a cooler day the same amount of light would not burn them. Considering the temps outdoors in Houston, I would guess a shading close to 60 to 75 % from normal noon day light would be advisable. for me "scorched" is the buzzword that brought to my mind the exact type of damage your cattleya leaf shows. "jtill" wrote in message oups.com... This should show the scorched CATT although I am having startup problems with this Blog. http://joerex99z.blogspot.com/2006_0...z_archive.html Joe T Baytown |
#6
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Sunburn
Yes that's sun/heat burn for sure. You can even see the line where shade
from the upper leaf protected some of the tissue from burning. You can see a less severe burn on adjacent leaves which are on the same plane in relationship to the light source. Temperature on a hot day can contribute to the burn; where on a cooler day the same amount of light would not burn them. Considering the temps outdoors in Houston, I would guess a shading close to 60 to 75 % from normal noon day light would be advisable. for me "scorched" is the buzzword that brought to my mind the exact type of damage your cattleya leaf shows. "jtill" wrote in message oups.com... Al wrote: in cattleya bumpy, raised, rough, discolored patches in the upper surface epidermal tissue of a leaf show up in about 24 to 48 hours after a "burn", even longer in some cases. The mesophyll layer and underside of the leaf may not be destroyed may continue to function. It usually but not always shows up on tissue that is perpendicular to the angle of the light/heat source. You may notice that sharp lines delineating burned and non burned tissue that seem to parallel the shadow cast by nearby leaves of other things. In contrast it is possible to burn the whole plant of a phal completely "white" in just a few hours of direct sun at the right time of year here in Virginia. It is harder to burn the same tissue if the light level/heat level is increased slowly over several weeks, months and once the tissue has paled because chlorophyll reduction. I often see sudden burning in the spring since the increasing intensity of the sun gets ahead of my shade cloth application. There are other symptoms of 'burn' on different orchid's leaf tissue. Under the right conditions thin leaved oncidiums will burn flat and dead all the way through as even the mesophyll layer and lower epidermal tissue gets destroyed by the heat/light. There are many other ways to interpret your question depending on how I think about the type of burn, and the light intensity and duration you have in mind. It can happen slowly or faster depending on all kinds of variables. Got pictures for abpo? "jtill" wrote in message oups.com... How quickly does sunburn show up? I seem to have scorched one CATT but it's neighbors look fine. Just trying to push the light to far for "Mother's Favorite" I guess. Joe T Burned in Baytown This should show the scorched CATT although I am having startup problems with this Blog. http://joerex99z.blogspot.com/2006_0...z_archive.html Joe T Baytown |
#7
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Sunburn
Your NoID of 10 years in the attractive white glazed pot appears to be
either a Maxillaria or a Coelogyne. A closer photo of the pseudobulbs, showing multiple angles, might help with a better ID. -Eric in SF www.orchidphotos.org |
#8
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Sunburn
Thanks Eric, that should help me in tailoring care to improve plant
growth. I have been calling it an Oncidium for years. It is a wonder it is still alive, last year I started reading books about orchids and reading orchid forums, so, hopefully, I am doing better on that score. Have you noticed that there are few photos of orchid plants? I will post more photos. It has very small, spider web like roots. Supposedly from Southern Brazil near Novo Hamburgo, elevation 1000 meters. Joe T Baytown Tx Eric Hunt wrote: Your NoID of 10 years in the attractive white glazed pot appears to be either a Maxillaria or a Coelogyne. A closer photo of the pseudobulbs, showing multiple angles, might help with a better ID. -Eric in SF www.orchidphotos.org |
#9
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Sunburn
Joe,
Then it's not a Coelogyne. =) My very first thought was a Brazilian maxillaria, along the lines of Maxillaria picta. 1000 meters is warm to intermediate. Your plant *looks* reasonably healthy, with normal-sized pseudobulbs, not much crenation (wrinkling) of the pseudobulbs and a good light green color to the leaves. If it's been struggling but is now happy, it might take a season or two before you see blooms, while it rebuilds strength. Let us know when you've posted additional photos to your blog! -Eric in SF www.orchidphotos.org "jtill" wrote in message ups.com... Thanks Eric, that should help me in tailoring care to improve plant growth. I have been calling it an Oncidium for years. It is a wonder it |
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