From

Location

Message

Date Posted

Owensboro, Ky.

Novice grower looking for definition of term. I have seen the word necrotic used on several different threads describing several different conditions. What is necrotic as it relates to AG's? My mom is a retired nurse and says necrotic means dead. Is necrotic just a general term to describe dead areas? My first plant out this year seemed to crimp around the edges of the 2nd true leaf...hot and sunny the first day out...is that necrotic? Thanks Peace Wayne

4/14/2005 6:52:18 AM

Garden State Pumpkins

Pretty close...In vegetation necrosis simply indicates that the plant or area on the plant has sustained damage. Chemical leaf burn via insecticde or herbicide or fertilizer burn can cause a leaf condition that for example burns the edges of the leaf. It may start as a discoloration around the edge the eventually turn brown and crisp...the leaf is necrotic...although the plant may recover and AG's usually will you refer to the burned area as necrotic. If your plant wasn't hardened off prior to it's first exposure to direct sun I would say the edges curling are a sign of "sun burn" and those edges will probably brown up and become necrotic.

4/14/2005 7:20:53 AM

Long Island,New York

Crimping around the edges of young plants first few leaves is very very common and not a problem. I've often called this situation "bedsheet corners" after its resemblence to the fitted bedsheets (bottom sheet with the elastic).I just carefully separate the edge to allow the leaf to expand normally...it gets a bit ugly but works and isnt a sign of any problems.
Also...lol...before it comes up....yellow spots can be normal too...........G

4/14/2005 5:47:18 PM

Ctpumpkin@optonline.net

"Necro" is latin for dead. So brown dry unproductive plant tissues are simply dead. So anything necrotic is bad.

The cause is always the concern since some abiotic causes are avoidable while pathogenic fungal or insect causes must be identified & corrected to prevent spread.

4/14/2005 8:58:19 PM

Appalachian Mtns.

In healthcare necrotic means dead, period.

4/15/2005 5:13:17 AM

Owensboro, Ky.

Tremor, now ya went and did it. lol Can you give me a laymans definition for (1) abiotic (2) pathogenic? Thanks for all the help. It sure makes it easier to know what is being said when I know what is being said. Peace Wayne

4/15/2005 6:47:34 AM

New Jersey

A pathogen (literally "birth of pain" from the Greek) is a biological agent that can cause disease to its host. A synonym of pathogen is "infectious agent". The term "pathogen" is most often used for agents that disrupt the normal physiology of a multicellular animal or plant. However, pathogens can infect unicellular organisms from all of the biological kingdoms.

Abiotic factors are geological, geographical and climatological parameters. A biotope is an environmentally uniform region characterized by a particular set of abiotic ecological factors. Specific abiotic factors include:

water, which is at the same time an essential element to life and a milieu
air, which provides oxygen and carbon dioxide to living species and allows the dissemination of pollen and spores
soil, at the same time source of nutriment and physical support
soil pH, salinity, nitrogen and phosphorous content, ability to retain water, and density are all influential
temperature, which should not exceed certain extremes, even if tolerance to heat is significant for some species
light, which provides energy to the ecosystem through photosynthesis
natural disasters can also be considered abiotic

-Source Wikipedia http://www.wikipedia.org

4/15/2005 5:16:47 PM

New Jersey

An organism's environment is in part, defined by abiotic and biotic factors. Basically anything not living or living which effects the organism.

If it rains today, that effect you.
If a deer bites your finger off, that effects you.


If it's too hot for your pumpkin. Abiotic
If a pathogen gives your pumpkin a disease. Biotic

4/15/2005 5:20:53 PM

Ctpumpkin@optonline.net

Well said.

4/15/2005 7:24:51 PM

Owensboro, Ky.

And when I put a tender sprout into a too hot hoop house...idiotic? Thanks Peace Wayne

4/15/2005 9:28:55 PM

Sioux Falls, SD garyboer@dakotalink.com

:)

4/16/2005 12:26:07 AM

Mocksville, NC

Tremor. and giantvegenetics gave you a very clear, and concise answer! Well said, but WSM you kept me LMAO. Too cool under fire. Grow'em big man.

4/18/2005 9:58:50 PM

Owensboro, Ky.

Thanks Rog, and to all at BP who consistently offer "clear and concise" answers to questions posted by us newbies. What a great learning experience this is! And after all this is supposed to be a fun thing. What is the old saying...if you can't laugh at yourself....!!! Thanks again Peace Wayne

4/19/2005 6:47:23 AM