Currants are an alternate host for white pine blister rust, so avoid planting them with white pines. Fortunately, white pine blister rust generally isn't a problem in the Rocky Mountain and High Plains regions.
The primary host is a juniper (either J. scopulorum or J. virginiana will do) and the alternate host is a hawthorn (a mountain ash (Sorbus, spp.) or an apple/crabapple (Malus, spp.) works, too).
In the spring, the aphids feed on apple leaves and fruits, and in the summer move to alternate hosts, such as narrow-leaved plantain.
The alternate host is the eastern hemlock, where the clustercup stage appears on its needles. This stage is not necessary to the spread of the fungus among the Heath family as the summer stage can over-winter on rhododendron.
The cultivation of gooseberries is restricted in some areas because the plants are alternate hosts for white pine blister rust. Contact your cooperative extension office for Information on restrictions in your state.
Rhubarb curculio—a half-inch long, yellow-gray beetle—damages stalks and crowns by boring holes in which to lay its eggs. Handpick adult curculios and destroy nearby curly dock (Rumex crispus), a weed which is an alternate host for this ...
 See also: Alternate, Ternate, Plant, Host, Spring
  
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