Two main aphid species account for most ornamental infestations in Alaska greenhouses. Regional differences are common. In different parts of Alaska, aphids vary in insecticide resistance, crop preferences and seasonal activity. Strategies that work in one part of Alaska may not be as effective in another region of the state.
Aphids multiply rapidly.
Their numbers can be overwhelming before you have time to react. IPM of Alaska has documented pesticide resistant aphids throughout the greenhouse industry in Alaska. Aphids can develop pesticide resistance easily. Aphids give birth to genetically identical females and survive on a wide host range throughout Alaska, giving them efficient mechanisms for developing insecticide resistance. Pesticide resistance is nearly always present in some degree in aphid populations in Alaska greenhouses.