It sounds like you are describing Fungus gnats. Fungus gnats are common pests in houseplants throughout the U.S.
Often times Fruit files are mistaken for Fungus gnats. Fungus gnats are black or dark brown flies and measure approximately a sixth of an inch. They look somewhat like tiny mosquitoes because when flying their legs are noticeably long and gangly. Fruit flies tend to be bigger than Fungus gnats. Fruit flies measure approximately an eighth of an inch and are plumper and easier to see than a small Fungus gnats.
These worms are most likely cabbage loopers. Apply Bonide’s Thuricide or Captain Jack's Dead Bug Brew, as they both contain a bacteria that the worms (caterpillars) will ingest and then die. It works very well on worms and caterpillars without harming beneficial insects. These two products can be used up to day of harvest on cabbage and cauliflower.
This large caterpillar is most likely a tomato hornworm. To control them, apply Bonide’s Thuricide or Captain Jack's Dead Bug Brew, as they both contain a bacteria that the worms (caterpillars) will ingest and then die. It works very well on worms and caterpillars without harming beneficial insects. These two products can be used up to day of harvest on tomatoes.
Chances are you have grubs, the larvae stage of Japanese, or June Beetles. To make sure, you need to dig into the soil along the edge of the affected area. These worms are white with a brown head and will be curled up in the shape of the letter C. If you find them apply, Bonide Annual Grub Beater, Eight Insect Control, Systemic Insect Spray RTS or Insect and Grub, according to the label’s directions.
Since mosquitoes are flying insects, it can be harder to control them. With timely pesticide applications, using Mosquito Beater Ready to Spray, Eight Insect Control Yard & Garden, or Malathion in the early morning or late afternoon in and around shrubs, lawns and other areas where mosquitoes congregate, control can be achieved. Look for areas that retain water and drain them, as this is where the mosquitoes breed.
Cutworms are most likely the culprits. They feed on young plants and will eat through the stems causing the plants to lie down like they have been cut. Apply Eight Insect Control Vegetable Fruit & Flower, Garden Dust, Eight Garden Dust, Dragoon Dust or Captain Jack's Dead Bug Brew Dust around the base of the plants to control these soil pests.
For best results, apply when temperature is between 50 and 75 degrees Fahrenheit.
The label lists many fruits and vegetables. Please refer to the label for particular plant.
Insects ingest it and stop feeding.