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How to Manage Pests
UC Pest Management Guidelines
Peppers
Tobamovirus
Diseases
Pathogens: Various Tobamoviruses (Tobacco mosaic virus, etc.)
(Reviewed 12/09,
updated 12/09)
In this Guideline:
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Symptoms on plants infected with Tobacco mosaic tobamoviruses vary among
cultivars and with specific viruses or strains. Symptoms can include necrosis
on any plant part, defoliation, leaf distortion, and/or mosaic symptoms on
leaves, stems, and fruit.
An important source of primary
inoculum is contaminated seed. The virus is carried on the seed coat, and thus
can be removed from contaminated seeds by washing seed with dilute solutions of
tri-sodium phosphate. The tobamoviruses on pepper are readily spread
mechanically within the field by handling and mechanical damage to plants, but
not by insect, nematode or fungal vectors.
The tobamoviruses are very stable viruses. They can survive in plant
debris for many years.
The best control is to use seed that
has been treated to eliminate the seedborne inoculum. Minimizing plant handling
and damage also is important for reducing field spread of tobacco mosaic virus.
Good sources of plant resistance genes (L1-L4 genes) to various tobamoviruses
also exist and are present in commercially available cultivars. No chemical
strategies are effective.
UC IPM Pest Management Guidelines: Peppers
UC ANR Publication 3460
Diseases
S. T. Koike, UC Cooperative Extension, Monterey County
R. M. Davis, Plant Pathology, UC Davis
K. V. Subbarao, USDA Research Station, Salinas
Acknowledgment for contributions to Diseases:
B. W. Falk, Plant Pathology, UC Davis
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