Crows destroying my crop

There are many crows in Japan and they can be a nuisance to the farmers and gardeners. They like to eat the fruits and some vegetables that we grow.
One of my tomatoes were half eaten by a crow. Then, another fruit from my neighbour's garden was half-bitten and dropped into my garden.
Finally, I decided to use plastic flags to frighten them away and it works. At least for now, there no more visitation from the crows.