Most gardeners have had to deal with the negative effects of crows. These cunning and intelligent birds are especially troublesome to those who grow corn. Crows like to dig up the corn seeds before they have a chance to sprout. All manner of scarecrows and other devices have been tried to deter crows from coming in the garden. Stringing a line over the rows is one simple and effective method of discouraging crows from landing.
Drive the stakes into the ground three feet apart, in a staggered fashion, alternating back and forth on either side of the row of newly planted corn.
Tie the monofilament or twine to the first stake at either end of the row. Keep the line 4 to 5 inches above the ground.
Weave the line from one side to the other in a zigzag pattern. Keep the line tight wrapping around each pole and tying it off at the last stake.
Repeat the process for any additional rows.
Remove the line after the corn plants have reached the height of the monofilament.
Mount a plastic owl on the roof where you see crows. This method of scaring the crows away will only work if you move the owl to a different location on your roof every couple of days. Otherwise, the crows will get use to seeing the owl in one spot and will cease to be scared of it.
Position a recorder on the roof and play distress calls. According to the University of Delaware, move the recorder every few days to continue deceiving the crows.
Let your pets loose in the yard. Train your dog to chase the crows that make their way on to your property, or let your cat do it, since cats are natural born hunters. If you don't have a dog or a cat, consider adopting one. The crows will get sick of being chased by the pets and your new dog or cat will by a companion for life..
Remove any food sources attracting the crows. Keep your pet food indoors, remove any bird feeders and keep mice and snakes off of your property.
Analyze your hen house for points of unwanted entry. Replace any holes in the wire mesh, walls, roof, and floor if necessary. Make sure you keep the door closed at all times.
Ensure the coop opening to the nest boxes is large enough to fit only one hen through.
Put more nesting material into the nests and add a barrier across the front of the nest to prevent the hens' kicking out the material. This allows the hen eggs to be partially buried and out of sight, making it hard for the crows to see the eggs.
Place a fake bird of prey on top of the cage.
Keep pregnant hens inside their house to ensure they lay their eggs inside.
Use a sonic, or ultrasonic repellent device. Simply place it near the hen house and let the device do the work of using sound waves to scare away the birds.
Shoot at the crows with a gun. Any type of gun that fires projectiles or makes a loud sound will work. Shoot to kill or simply scare.