A reminder to keep malathion far away from canola seed. The Canola Council of Canada reminds growers to keep malathion far away from canola seed. Council crop production vp JoAnne Buth says growers must not use the insecticide to treat canola in storage bins. In fact, she says growers shouldn’t store canola in bins that have been treated with malathion in the past six months. Buth says residues detected in canola exported to Japan could cost the industry, including farmers, millions of dollars in lost business. Japan is the number one customer of Canadian canola seed with imports valued at over $450 million each year. If malathion is detected above the allowable limit in Japan, Buth says the shipment will be rejected and subsequent shipments would be subjected to increased testing. It is important to keep canola cool and dry in the bin. For long term storage, temperatures should be kept at less than 15 °C and grain moisture levels below 8 %.