Sodininkystė ir daržininkystė - Sodininkystės ir daržininkystės institutas

SODININKYSTË IR DARÞININKYSTË. SCIENTIFIC ARTICLES.2006. 25(1). 137-143.EFFECT OF METEOROLOGICAL CONDITION ON SPREAD ANDINTENSITY OF PERONOSPORA DESTRUCTOR IN ONIONV. Bulovienë, E. Survilienë, L. RaudonisSummaryField experiments in onion Štuttgarter Riesen crop were carried out at the LithuanianInstitute of Horticulture in 2004-2005. Spread and intensity of downy mildew wasobserved in relation to weather factors in the onion field. Downy mildew was developedin onions during 2004-2005. There was recorded statistically higher percent of diseasespread and intensity in 2005 when the biggest amount of precipitation fell at the firstdays of July and the mean air temperature was low. Disease spread increased up to 89%and intensity up to 66.6%. There was recorded that infection started when meantemperature of three days was 14-16°C, relative humidity 87.5-96% and precipitationper day – 1.8 mm.Key words: disease intensity, humidity, onions, Peronospora destructor,precipitation, spread, temperature.143