Resumo

CAMACHO, Belkis; PINEDA, Juan  e  GONZALEZ, Hilda. Solarization and green manure for integrated control of  Pyrenochaeta terrestris (Hansen) on onion. Bioagro [online]. 2013, vol.25, n.1, pp.65-70. ISSN 1316-3361.

A determining factor in the decrease in the yield of onion (Allium cepa L.) is the pink root disease caused by Pyrenochaeta terrestris (Hansen). An alternative in the control of this disease is the solarization of soil, which is an erradicative measure of pathogens. A field experiment was carried out in naturally infested soil with Pyrenochaeta terrestris in Quíbor, Lara State, Venezuela, to determine the effect of solar heating in the soil by means of mulching with transparent polyethylene sheets, green manure applications, and combination of both treatments on the incidence and severity of onion pink root disease. A split-plot experiment was conduced, where main plots comprised those with presence and absence of solarization, and subplots were a factorial combination of green manure (Canavalia sp., Crotalaria sp., Glycine max L.) with and without solarization. There were six replications. The mulching of the soil with transparent polyethylene sheets for 45 days resulted in a decrease of the incidence and severity of disease, in solarized soil the incidence was 18.16 % and in non solarized soil was 52.33 %; this difference represents 65.29 % of disease control. With respect to the severity, there was a reduction close to 12% with solarization. Soil temperatures in the mulched soil varied from 4.6 to 10.9 °C higher than in unmulched soil. Soil solarization was effective for the control of pink root, and green manure application did not provide any additional effect for the disease control.

Palavras-chave : Allium cepa; Canavalia sp; Crotalaria sp; Glycine max; organic amendments.

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