Apple Union Necrosis and Decline
I. Introduction. Apple union necrosis and decline (AUND) is caused by tomato ringspot virus (TmRSV).
Necrosis
The death of plant tissue. It often takes the form of necrotic spots on leaves.
Nectar ...
necrosis. Death of tissue accompanied by dark brown discoloration, usually occurring in a well-defined part of a plant, such as the portion of a leaf between leaf veins or the xylem or phloem in a stem or tuber.
necrosis Tissue death.
nectar A sugary fluid secreted by some flowers.
nectar guide A contrasting color pattern on a flower that guides pollinators to the nectar.
Necrosis - localized death of a plant part.
Neck - tubular glass end of the HID bulb, attached to the threads.
Nutrient - plant food, essential elements N-P-K, secondary and trace elements fundamental to plant life.
Deficiency in tomatoes and lettuce can lead to chlorosis in older leaves, necrosis and infolding of the leaves. In brassicas, leaves develop whiptail (which describes the shape of the leaves).
In most cold climates, you should expect that every part of the cane that is not covered will suffer damage or necrosis, which has to be pruned off in the spring. So the deeper the soil mound, the more of the cane will survive.
Broadleaf Weed Control - Step 4
In 7-10 days, the broadleaf weeds should begin to exhibit signs of necrosis and will shortly die. Rake dead weeds out of the lawn and dispose of them in the garbage - do not put them in your compost pile.
Leaf stems may twist or spiral. Foliar spotting may be a result of herbicide spray drift. Overall necrosis, or death of tissue, is caused by a number of products and can occur in advanced stages of herbicide poisoning.
For this reason the symptoms of potassium and iron deficiency are almost identical in the initial stages. Potassium deficiency begins with leaf yellowing, which eventually spreads between the veins. Leaf tips and margins show scorch and necrosis.
 See also: Plant, Leaf, Infection, Produce, Water
  
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