Safely disposing of agricultural contraband

I have the habit of taking an apple, orange, or other portable fruit from hotel breakfasts and tucking it into my bag to eat later in the day. I might do this each day of a 5-day conference, for example. All is fine until the day I head home in the evening and perhaps didn't eat the fruit that day. I have been known to forget about this until crossing customs on my way home. No harm done: I declare it, they take it, and they get rid of it safely. But what if I forget? What if I end up at my house with a French apple or a German orange or whatever? These are items Canada wants to exclude in order to be sure no foreign pests wreak havoc on our own ecosystem.

A second example. Recently, in China, I bought what I thought was candy (my translator asked the store person who said "sweet, tastes like fruit, you will like") but turned out to be dried fruit. Some had seeds in it. Eating that worked out well at the Great Wall, but what if I had brought it home and then discovered it was dried fruit that contained seeds?

My options at home for future hypothetical fruit-and-veg I should not have brought include (after eating the edible parts):

• composting seeds, peel etc in my home compost heap
• putting them in the garbage to go to my local landfill
• burning them in an ordinary outdoor fire

Which is the safest way, to make sure that my forgetfulness doesn't threaten my local agriculture etc?