 Fight back with Summit Year-Round Spray Oil and Summit Mosquito Bits. Organic Summit Year-Round Spray Oil kills insect pests on indoor and outdoor plants. All-natural mosquito bits kill fungal gnats, larvae, and container plants. Both products are harmless to people, plants, and wildlife. Summit Year-Round Spray Oil and Summit Mosquito Bit are available at garden centers, hardware stores, and at Summit.com.