Laaz,
I found this info.
On the lighter side:
Bypassing the first one, maybe if we can't get Guava trees we could grow strong smelly onions. Or tie brussels sprouts and cabbages to our trees like Xmass ornaments.
Terry
Dimethyl disulfide
http://www.osha.gov/dts/chemicalsampling/data/CH_236060.html
Notes:
1. OSHA does not have a PEL for dimethyl disulfide, which is one of the volatile compounds identified with human fecal odor.
2. Vapor/air mixtures of dimethyl disulfide above 24°C may be explosive.
3. Dimethyl disulfide (methyl disulfide) is listed by the FDA as a synthetic flavoring substance that is permitted for direct addition to food for human consumption (21 CFR 172.515), and
it occurs naturally in certain foods (e.g., cabbage, brussels sprouts, garlic, onions).
4. Hematological health effects of organic sulfide exposure on employees at a pulp and paper plant have been studied, but the role of dimethyl disulfide in these effects is unknown.
5. In subchronic inhalational toxicity studies with rats in concentrations of dimethyl disulfide up to 125 ppm (6 hours/ day, 5 days/week for 13 weeks), the NOAEL was 5 ppm in males and 25 ppm in females.
6. In 24-hour whole-body exposure studies, the LC50 of dimethyl disulfide in mice was estimated to be 1.5 µl/l of air, which was close to the concentration needed for 100% lethality in cockroaches (1.66 µl/l of air).
http://www.growingproduce.com/floridagrower/?storyid=2266
In 2006, South Vietnamese farmers reported that planting guava trees among citrus trees reduced psyllid infestations and kept greening out of their groves. This created a great deal of interest and suggested that guava might produce some kind of volatile compound that kept psyllids out of citrus groves.
