Malathion that is
more than a year old, especially if it has been exposed to temperatures above
20 Celsius, poses a health risk because it can convert to a toxic compound
called isomalathion.
The government
and the companies are urging farmers to return any malathion that is more than
a year old, especially if it has been exposed to temperatures above 20.
It also poses a
risk if it has been stored near other pesticides, seeds and fertilizers,
according to the advisory from Health Canada.
