Tristeza


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tristeza

[tris′tā·zə]
(plant pathology)
A viral disease spread by three species of aphids that causes rapid decline or death of trees of sweet orange, grapefruit, and tangerine propagated on certain susceptible rootstock varieties.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tristeza

 

a viral disease of citrus trees grafted on the root-stocks of the sour orange and lime. Tristeza is common in tropical and subtropical regions. It does not occur in the USSR, where it is the object of external quarantine. The disease is characterized by the dying of conducting tissues at the site where the scion unites with the rootstock. Mild infection causes chlorosis. The leaf blades curl, and then the leaves dry out and fall off. Severe infection kills individual branches and entire trees. In diseased plants, shoot formation is weak and the roots rot. The trees flower earlier and more abundantly, but the fruits are small and fall off prematurely. The virus is transmitted from the stock and grafts by the black citrus and melon aphids and by the dodder Cuscuta subinclusa.

Control measures include observing imported material in introduction-quarantine nurseries for three years, using tristeza-resistant rootstocks of trifoliate orange and rangpur lime, and controlling insects that transmit the disease.

I. T. ABRAMOVA [26–661–t]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Tristeza also assured the public that once the weather improved, the rice would immediately be delivered to warehouses in the region.
Keywords: Citrus tristeza virus, Coat protein, Molecular characterization, Phylogenetic analysis.
That is not the case because we have enough stocks from commercial traders and households," Tristeza said on Friday.
Tristeza said that, as of last Friday, rice stocks in different warehouses in the six provinces of Eastern Visayas was only 52,000 cavans, which is equivalent to 1.7 days of regional consumption.