text: Re: Viral Leaf Roll and Physiological Leaf Roll
  
  Fri May 02, 2014 11:18 am
  
  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.
  
  Re: Viral Leaf Roll and Physiological Leaf Roll
  
  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.
  
  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.
  
  Re: Viral Leaf Roll and Physiological Leaf Roll
  
  Sat May 03, 2014 4:18 pm
  
  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.
  
  Re: Viral Leaf Roll and Physiological Leaf Roll
  
  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.
  
  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.
  
  Re: Viral Leaf Roll and Physiological Leaf Roll
  
  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.
  
  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.