Kiwifruit banana. Once a kiwifruit is ripe, however, it is preserved optimally when stored far from other fruits, as it is very sensitive to the ethylene gas they may emit, thereby tending to over-ripen even in the refrigerator. If stored appropriately, ripe kiwifruit normally keep for about one to two weeks. "Pseudomonas syringae actinidiae" (PSA) was first identified in Japan in the 1980s. This bacterial strain has been controlled and managed successfully in orchards in Asia. In 1992, it was found in northern Italy. In 2007/2008, economic losses were observed, as a more virulent strain became more dominant (PSA V). In
Gooseberry development stage. Other potential threats are V-moth ("Macaria wauaria") and gooseberry sawfly ("Nematus ribesii"). "Nematus ribesii" grubs will bury themselves in the ground to pupate; on hatching into adult form, they lay their eggs, which soon hatch into larvae, on the underside of gooseberry leaves. Insecticides used in the 19th-century against these included tar water, weak solutions of carbolic acid, and powdered hellebore, which worked against magpie moths and V-moths as well as gooseberry sawflies. (Foxglove and tobacco infusions were also sometimes used.) A 2008 study concluded that a solution of magnesium sulfate applied to a bush's leaves has a