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Leaf miner problems include the larvae of moths, flies, and beetles that feed on leaves, hence they 'mine' the plant. Evidence of this problem includes spots, discoloration, and pitting. In lettuces, the leaf miner typically feeds on the lower leaves that can be trimmed.
What is it?
One of the most virulent foodborne pathogens, Listeria monocytogenes is indicated in more than 1,600 illnesses each year in the United States. It is a non-spore forming rod-shaped bacterium that destroys red blood cells and can cause septicemia and meningitis. It’s found in soil, water, and the intestinal tracts of chicken and cows. Because it can live and grow in cold temperatures, it especially dangerous. Listeriosis can be fatal and has even higher death rates than Salmonella.
How is it spread?
Listeriosis is usually spread by eating food contaminated by the bacterium. Foods that are often implicated include deli meats, hot dogs, meat spreads, unpasteurized dairy products, smoked seafood, and raw sprouts.
Typical Symptoms
Fever, fatigue, confusion, muscle aches, and gastrointestinal problems including diarrhea.
Most at risk
Young children, pregnant women, the elderly, and immunocompromised persons are most at risk, but given the right conditions, anyone can suffer this illness.
For more information, see:
http://www.cdc.gov/listeria/definition.html
http://en.wikipedia.org/wiki/Listeria_monocytogenes
http://www.foodsafety.gov/poisoning/causes/bacteriaviruses/listeria/index.html