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Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

ORMENO N, Juan  y  SEPULVEDA R, Paulina. Presence of Different Sweet Pepper (Capsicum annuum L.) Viruses on Associated Weed Species. Agric. Téc. [online]. 2005, vol.65, n.4, pp.343-355. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072005000400001.

In a two growth-cycle survey, 30 annual and 13 perennial weed species were determined in different sweet pepper (Capsicum annuum L.) growing areas of the Limari and Elqui valleys of Coquimbo Region of Chile (29° to 30º S lat). The samples were randomly taken in and outside tomato fields, with and without crops present, in winter and spring. A total of 676 weed plants were collected, with a total of 379 samples being analyzed. DAS-ELISA was used to test the presence of Cucumber mosaic virus (CMV), Tomato spotted wilt virus (TSWV), Alfalfa mosaic virus (AMV), Potato virus Y (PVY) and Impatients necrotic spot virus (INSV). A 17% (64) of all collected samples were positive to at least one virus, of which 7.4% (28) came from symptomatic weeds and 9.4% (36) were from symptomless hosts. Jimsonweed (Datura spp.) was positive to CMV and PVY; apple-of-Peru (Nicandra physalodes) to AMV, CMV and PVY; black nightshade (Solanum nigrum) to CMV and PVY; sowthistle (Sonchus spp.) to AMV and TSWV; small-flower galinsoga (Galinsoga parviflora) to AMV, CMV, TSWV and INSV; common lambsquarters (Chenopodium spp.) to AMV, CMV, TSWV, PVY and INSV, among the principle species. Using a relative potential infection index (IPIR), weeds having highest values were small-flower galinsoga (74.7), apple-of-Peru (11.2), black nightshade (6.3) and lambsquarters (6.0). Species such as sowthistle, jimsonweed, bristly mallow (Modiola<> caroliniana), chickweed (Stellaria media) and pigweed (Amaranthus spp.) had indexes lower than 1.0. Small-flower galinsoga and apple-of-Peru had more than one virus, and these multiple virus infections were prevalent over single infections. It is imperative to control host weeds within cultivated areas and surroundings to reduce the incidence and dispersal of the viruses in sweet pepper plants.

Palabras clave : weeds; virus; epidemiology; sweet peppers; CMV; AMV; PVY; TSWV; INSV.

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