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| virology:s:sunburn [2026/07/04 19:22] – vaugith | virology:s:sunburn [2026/07/04 19:24] (current) – vaugith |
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| * **Distribution:** The damage occurs almost exclusively on the sides or tips of the plant that receive the most direct exposure to the sun. | * **Distribution:** The damage occurs almost exclusively on the sides or tips of the plant that receive the most direct exposure to the sun. |
| * **Progression:** Over time, severely damaged skin callouses over, forming dry, hard, tan or white scars. However, if the burn is extreme, the tissue can become sunken, orange, and mushy, indicating secondary rot or tissue death. Cacti with severe burns resulting in scar tissue or tissue death lose a significant portion of their photosynthetic capability, which can cause them to lag in growth compared to healthy specimens. | * **Progression:** Over time, severely damaged skin callouses over, forming dry, hard, tan or white scars. However, if the burn is extreme, the tissue can become sunken, orange, and mushy, indicating secondary rot or tissue death. Cacti with severe burns resulting in scar tissue or tissue death lose a significant portion of their photosynthetic capability, which can cause them to lag in growth compared to healthy specimens. |
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| | ==== Cause ==== |
| | Sunburn develops due to: |
| | * **Inadequate Acclimation:** Moving a cactus directly from low-light conditions (such as indoor winter storage, greenhouses, or shipping boxes) into full outdoor sun without a gradual transition period. |
| | * **Reorientation:** Rotating a cactus so that a side previously acclimated to the shade is suddenly turned toward direct sunlight. |
| | * **Photo-Phytotoxicity:** Applying certain chemical or oil-based sprays (such as neem oil, isopropyl alcohol, certain pest and fungal treatments) can cause increased susceptibility to sunburn or can amplify direct light and cause burns. Always read and follow product labels. Its safest to apply most products in the shade or at dusk to avoid burns. |
| | * **Reflective Glare:** Placement near highly reflective surfaces, such as windows. If indoors under artificial lights, using a reflective, untextured surround. |
| | * **Environmental Extremes:** Sudden seasonal transitions, intense sunny periods, and temperature fluctuations. |
| | * **Loss of Glaucous Layer:** Environmental stress or certain pest treatments and foliar feed applications can cause cacti to lose their protective waxy glaucous layer, leaving the underlying epidermal tissue vulnerable to solar damage. |
| | * **Nutrient deficiency:** Chlorosis, caused by nutrient deficiency, can leave affected tissue more susceptible to sunburn. |
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| ====Similar related conditions==== | ====Similar related conditions==== |
| * **Frost Damage:** Can look similar to sunburn scars but occurs after cold exposure. | * **Frost Damage:** Can look similar to sunburn scars but occurs after cold exposure. |
| * [[:virology:T:Thrips|Thrip Damage]]: Which causes sandpaper like scarring on the epidermis. | * [[:virology:T:Thrips|Thrip Damage]]: Which causes sandpaper like scarring on the epidermis. |
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| ==== Cause ==== | |
| Sunburn develops due to: | |
| * **Inadequate Acclimation:** Moving a cactus directly from low-light conditions (such as indoor winter storage, greenhouses, or shipping boxes) into full outdoor sun without a gradual transition period. | |
| * **Reorientation:** Rotating a cactus so that a side previously acclimated to the shade is suddenly turned toward direct sunlight. | |
| * **Photo-Phytotoxicity:** Applying certain chemical or oil-based sprays (such as neem oil, isopropyl alcohol, certain pest and fungal treatments) can cause increased susceptibility to sunburn or can amplify direct light and cause burns. Always read and follow product labels. Its safest to apply most products in the shade or at dusk to avoid burns. | |
| * **Reflective Glare:** Placement near highly reflective surfaces, such as windows. If indoors under artificial lights, using a reflective, untextured surround. | |
| * **Environmental Extremes:** Sudden seasonal transitions, intense sunny periods, and temperature fluctuations. | |
| * **Loss of Glaucous Layer:** Environmental stress or certain pest treatments and foliar feed applications can cause cacti to lose their protective waxy glaucous layer, leaving the underlying epidermal tissue vulnerable to solar damage. | |
| * **Nutrient deficiency:** Chlorosis, caused by nutrient deficiency, can leave affected tissue more susceptible to sunburn. | |
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| ===== Treatment & Management ===== | ===== Treatment & Management ===== |
