It’s a wise practice in these droughty times to plant herbaceous perennials.
To those of you who are forbidden to use sprinklers or hoses from September 6-20th due to water pipeline repairs, don’t panic. Established trees and shrubs, as well as herbaceous perennials such as lily-of-the-Nile , daylily , canna and, especially, irises , will not suffer significant, if any, damage due to lack of water over such a short period.
The easiest way to dispatch oleander aphids – bright orange in color with black legs – is to blast them with a strong jet of water. Don’t worry about knocking off monarch eggs since they are more strongly attached to their milkweed host than the offending aphids.Alternatively, as you suggest, you can always rub aphids off of milkweed with your thumb and forefinger.
Detergent sprays are commonly recommended for aphid control, the simplest concoction being one tablespoon of dish soap dissolved in a quart of water. However, according to Dr. Karen Oberhauser of the University of Minnesota, who has studied aphids, monarchs, and milkweeds for decades, “Detergent treatments will kill any live insects on aphid-infested plants, including monarch eggs, monarch larvae, and aphid predators like syrphid fly larvae, ladybug larvae, and lacewing larvae.
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