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You can try spraying with Bonide Fung-onil Concentrate which is listed for phytophthora dieback. Prune out dead branches cutting back well into healthy tissue and spray with Bonide Fung-onil according to the label directions. This may not cure the infected kiwis though as the fungus is in the soil but may help control its spread to new growth. Soil drenches to control Phytophthora fungus are not available to the homeowner. Be sure that the soil where these are planted is well-drained and not soggy. Be careful not to overwater (especially if you have an underground sprinkling system). Try to water in the morning so that the foliage has a chance to dry during the day or if you hand water, try to avoid wetting the foliage. Water deeply when you water so that you only need to water once every 7-10 days.
Here is some information on growing kiwis from our friends from Edible Landscaping: http://ediblelandscaping.com/careguide/Kiwi/. The information on phytophthora is at the bottom of the page.