nosebleed21
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Viral Leaf Roll and Physiological Leaf Roll

What to look at to find out if it's viral or physiological leaf roll

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feldon30
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Re: Viral Leaf Roll and Physiological Leaf Roll

nosebleed21 wrote:What to look at to find out if it's viral or physiological leaf roll
Your geographic location will determine if viral is likely or not. Can you update your profile with your general location and zone?
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rainbowgardener
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Re: Viral Leaf Roll and Physiological Leaf Roll

well... usually diseases, besides curling would show some other symptoms like yellowing, spots on leaves, stunted growth, declining production etc. Physiological leaf roll, the leaves roll up and probably toughen up to prevent moisture loss, but don't show other symptoms. Part of why feldon asked about where you are, is that physiological leaf roll is an adaptation the plant has to prevent moisture loss, so it really only happens in hot, dry conditions.

https://www.clemson.edu/extension/hgic/h ... _roll.html
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imafan26
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Re: Viral Leaf Roll and Physiological Leaf Roll

Below is a link to tomato yellow leaf curl. It is a good example of a virus.
https://www.ctahr.hawaii.edu/oc/freepubs/pdf/PD-70.pdf

Viruses cause more than leaf distortion, they usually also have some mottling, or yellowing and generally stunted sick looking plants. Some virus and fungal infections cause yellowing in the early stages that look like a nutrient deficiency.

This is a link with pictures of leaves with common nutrient deficiencies.

https://5e.plantphys.net/article.php?id=289

Physiological leaf roll, the leaves roll and the plant may wilt in the heat, but it is most common in hot weather and the plant otherwise will have normal looking growth. It won't be stunted and the rolling leaves are not chlorotic, mottled or yellow.

https://cru.cahe.wsu.edu/CEPublications/ ... PNW616.pdf
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nosebleed21
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Re: Viral Leaf Roll and Physiological Leaf Roll

feldon30 wrote:
nosebleed21 wrote:What to look at to find out if it's viral or physiological leaf roll
Your geographic location will determine if viral is likely or not. Can you update your profile with your general location and zone?

Hi i am from the philippines

nosebleed21
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Location: Philippines

Re: Viral Leaf Roll and Physiological Leaf Roll

rainbowgardener wrote:well... usually diseases, besides curling would show some other symptoms like yellowing, spots on leaves, stunted growth, declining production etc. Physiological leaf roll, the leaves roll up and probably toughen up to prevent moisture loss, but don't show other symptoms. Part of why feldon asked about where you are, is that physiological leaf roll is an adaptation the plant has to prevent moisture loss, so it really only happens in hot, dry conditions.

https://www.clemson.edu/extension/hgic/h ... _roll.html


Hi i am from The Philippines

nosebleed21
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Re: Viral Leaf Roll and Physiological Leaf Roll

imafan26 wrote:Below is a link to tomato yellow leaf curl. It is a good example of a virus.
https://www.ctahr.hawaii.edu/oc/freepubs/pdf/PD-70.pdf

Viruses cause more than leaf distortion, they usually also have some mottling, or yellowing and generally stunted sick looking plants. Some virus and fungal infections cause yellowing in the early stages that look like a nutrient deficiency.

This is a link with pictures of leaves with common nutrient deficiencies.

https://5e.plantphys.net/article.php?id=289

Physiological leaf roll, the leaves roll and the plant may wilt in the heat, but it is most common in hot weather and the plant otherwise will have normal looking growth. It won't be stunted and the rolling leaves are not chlorotic, mottled or yellow.

https://cru.cahe.wsu.edu/CEPublications/ ... PNW616.pdf
this is super helpful especially the screenshot!!! Thanks!

nosebleed21
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Location: Philippines

Re: Viral Leaf Roll and Physiological Leaf Roll

nosebleed21 wrote:
imafan26 wrote:Below is a link to tomato yellow leaf curl. It is a good example of a virus.
https://www.ctahr.hawaii.edu/oc/freepubs/pdf/PD-70.pdf

Viruses cause more than leaf distortion, they usually also have some mottling, or yellowing and generally stunted sick looking plants. Some virus and fungal infections cause yellowing in the early stages that look like a nutrient deficiency.

This is a link with pictures of leaves with common nutrient deficiencies.

https://5e.plantphys.net/article.php?id=289

Physiological leaf roll, the leaves roll and the plant may wilt in the heat, but it is most common in hot weather and the plant otherwise will have normal looking growth. It won't be stunted and the rolling leaves are not chlorotic, mottled or yellow.

https://cru.cahe.wsu.edu/CEPublications/ ... PNW616.pdf

follow up question is viral leaf curl also soil borne?

this is super helpful especially the screenshot!!! Thanks!

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rainbowgardener
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Re: Viral Leaf Roll and Physiological Leaf Roll

Re: follow up question is viral leaf curl also soil borne?

Viral leaf curl could be any of several different viruses/ diseases. The tomato yellow leaf curl that was referred to is not soil borne, it is transmitted by the silverleaf whitefly.
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