The infectious nature of potato calico

Porter, D

The infectious nature of potato calico

Author

D. R. Porter

Author Affiliations

D. R. Porter was Assistant Olericulturist in the Experiment Station.

Publication Information

Hilgardia 6(9):277-294. DOI:10.3733/hilg.v06n09p277. November 1931.

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Abstract

Abstract does not appear. First page follows.

The nature of potato calico, a degeneration disease of the Irish potato, has been under investigation at the California Agricultural Experiment Station during three seasons. The disease has been observed in every important potato-producing district in the state, from San Diego County, in the extreme southern part, to Humboldt County, in the extreme north. It was prevalent in certain fields in the Delta region in 1929-1930; and growers in San Bernardino, Riverside, Tulare, and Kern counties have stated that calico is steadily increasing in prevalence in their fields, even though they continue to plant only their own seed stock. The evidence presented herewith establishes the infectious nature of potato calico, adding one more virus disease to the present list, All experiments and observations reported herein were carried out with the potato variety White Rose, or, where indicated, with seedlings.

Historical

In 1920, Hungerford⁽⁷⁾ described potato calico as a non-infectious disease and in later reports⁽⁸⁾⁽¹⁸⁾⁽¹⁹⁾ brought out that the disease was tuber-perpetuated; that the yield reduction by calico was slight, if measurable at all; and that chlorophyll deficiency was less pronounced at blossoming time than in the early life of the diseased plant. He further observed that about three per cent of the plants were infected and that the disease was commonly found in irrigated fields. Although he did not consider the disease a serious one, he recommended that diseased plants should be removed from the field.

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