![]() ![]() In addition, in areas where tomato ringspot virus is endemic, practices may be employed to minimize alternative virus hosts (i.e., deciduous weeds) and reduce nematode vector populations. Because of this, in apple production, two methods are used to control virus diseases: adoption of virus-free propagation materials and eradication of contaminated trees. How Virus Diseases Are SpreadĪpple virus diseases are mainly spread thorough vegetative propagation. ![]() Sometimes, however, losses are severe, and an acute viral infection can require tree removal. Often growers can maintain the productivity of diseased orchards at a profitable level by removing infected plant parts and replacing dead trees to limit the spread of the virus. Latent virus infection can produce small to moderate losses in fruit production. Viruses can remain latent, spreading through an orchard and inflicting damage, often without the growers’ knowledge. In general, virus diseases in perennial crop plants, such as apples, are more potentially damaging than in annual crops. ![]() Virus diseases cause economic losses through lower yields and reduced quality of apples and apple products. Virus and Other Graft-Transmissible Diseases and Disorders of Apples ![]()
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