Welcome to lawn renovation and the good news your lawn can be looking good in just a few months. First aerate to improve drainage. Cranefly larvare love moist soil. Then use a quality fertilizer for new seed such as Scotts Turf Builder Food for New Grass. Next spread a bit of topsoil in the law spots to level the lawn and then add a quality lawn seed. I recommend a mix of different seed types that will mix well with your seed color that you applied last summer. This means Scotts EZ Seed for Sun and Shade as you will get grass varieties that blend well. Once the weather warms the new seed will fill in the bare spots while the old lawn will thicken up with the fertilizer. Now about the cranefly. Dig up a four inch square plug or section of your lawn. Count the number of actual cranefly larvae you find. They look like fat, gray grubs and are called leather jackets as they are hard to squish! Multiply the number of larvae in 4 inches of area times 3. That will tell you the amount of larvae per square foot in your lawn. If you have less than 25 larvae per square foot you do not need to treat for cranefly as the numbers are so small that the birds and other natural predators will take care of the population that tends to go up and down in your area. Once your lawn fills in they will be less of a problem anyway. If instead your turf is heavily infested with more than 25 grubs per square food apply a grub killer such as Scotts Grub Ex or Scotts Snap Insect Killer for Lawns. Follow label instructions exactly for all products. Tackle these field goals and you will soon scare big, beautiful yardage. Keep growing, Marianne Binetti