Hilgardia
Hilgardia
Hilgardia
University of California
Hilgardia

Verticillium hadromycosis

Author

B. A. Rudolph

Author Affiliations

B. A. Rudolph was Assistant Plant Pathologist in the Experiment Station.

Publication Information

Hilgardia 5(9):197-361. DOI:10.3733/hilg.v05n09p197. March 1931.

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Abstract

Abstract does not appear. First page follows.

Review of the Contents

Verticillium hadromycosis is a plant disease specifically caused by the fungus Verticillium albo-atrum R, and B. and its related forms. It is widespread in the United States and abroad. At present it is occasioning considerable economic loss in the coastal counties of California.

The parasite is peculiar in that it does not confine its attacks to one host, or a few closely related hosts, as is so frequently the case with parasitic fungi, but attacks a large number of widely unrelated plants, many of which are of economic importance.

The disease syndrome is essentially as follows: The lower leaves of affected plants turn yellow in early summer and die as the parasite, which initiates its attack through the root system, passes slowly up the trunk or stem. The internodes are shortened and the plant is stunted. Internally the affected wood shows a characteristic brown discoloration. With the microscope the mycelium of the fungus may be seen in the lumina of the vessels of the discolored wood.

In annuals such as the tomato, potato, and other susceptible truck-crop plants an attack of the disease is generally fatal. Perennials such as economic fruit and forest trees, particularly when young, may be killed, or they may recover, depending upon the severity of the attack.

In California, the disease is referred to popularly as ‘black heart’ in stone fruits, ‘blue stem’ in bush fruits and ‘wilt’ in truck-crop plants. The syndrome in affected plants of these three distinct groups may vary somewhat, but the cultural similarity of the organisms isolated from them has led to cross-inoculation experiments by the author to determine whether the seemingly three distinct diseases are not of common origin, a fact previously not suspected in California.

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