Daily Archives: November 17, 2014
By Anne Dorrance, Ohio State University
This disease is caused by the fungus, Sclerotinia sclerotiorum and it is favored by cool damp conditions. Remember those morning fogs this summer and the fact that you hardly used your air conditioner? Perfect conditions for infection. This fungus forms hard black irregular shaped bodies called sclerotia. (photo of sclerotia inside stem) They are actually a mass of hyphae and if you break them open they will be pink inside. They can be mistaken for mice or rat droppings as well, the inside is a different color! When the conditions are cool and the canopy is closed, this fungus produces a very small mushroom (photo). This usually occurs during flowering and the spores then land on the dead flowers. This provides a perfect point of entry. This fungus produces oxalic acid – which degrades the tissue as it colonizes the plant. The infections that you see now occurred 2 to 4 weeks ago. Symptoms from the road will look like standing plants with a gray-green appearance. Eventually these plants will lodge. Once the leaves fall off – the plants will stand back up to some extent.
By Lynne Peeples, http://www.huffingtonpost.com/
The worn, heart-shaped rug that greeted you upon entering Angela Molloy Murphy’s preschool was a reflection of the love she has for the 17 children she cares for daily in her home’s remodeled basement.
To Tamara Rubin, however, the welcome mat was more of a warning sign.
“You need to throw this out,” Rubin told Murphy.
Rubin is executive director of the nonprofit Lead Safe America Foundation. On a visit to the preschool earlier this May, she pointed an X-ray fluorescence heavy-metal detector at the rug’s faded red threads and relayed the bad news: It was loaded with lead.
Within the course of an hour, Murphy learned just how pervasive the toxic heavy metal was in her home and school: It was in the chips of lead paint on her deck steps, in dust rubbed free from door and window frames, in the glazes on her students’ thrift-store mugs. The rug itself, Rubin suggested, was likely a reservoir for lead chips and dust tracked around on students’ shoes.
Lead has been a popular paint additive for centuries. It speeds up drying and increases durability, as its makers once boasted in their marketing materials. But as a judge ruled in a high-profile case in California last December, lead paint manufacturers spent much of the 1900s deceiving the public with another claim: That their product was safe, even for young children, despite a long history of evidence suggesting otherwise. Ben Franklin wrote of lead’s “mischievous” effects in 1786, and one lead-paint maker admitted in aninternal company memo in 1900 that “any paint is poisonous in proportion to the percentage of lead contained in it.”
The science remains clear that anyone can be affected by lead exposure, and that children under the age of 6 face the greatest risk. And as lead exposure is linked to a growing list of health conditions, researchers are finding that it takes less and less lead to put one at risk. Read more