Sodininkystė ir daržininkystė - Sodininkystės ir daržininkystės institutas

9 days disease development was slow, spread increased to 97% and diseaseintensity to 47.7%.252004 y./m.2005 y./m.1924-2000 average / vidurkis2015°C10504 5 6 7 8 9Months / MënesiaiFig. 1. Average of temperature during the investigation in 2004-2005 andcomparison with perennial average1 pav. Vidutinë oro temperatûra ir jos palyginimas su daugiameèiu vidurkiu, 2004-2005 m.1401202004 y./m.2005 y./m.1924-2000 y. average /vidurkismm1008060402004 5 6 7 8 9Months / MënesiaiFig. 2. Average of precipitation during the investigation in 2004-2005 andcomparison with perennial average2 pav. Vidutinis krituliø kiekis ir jo palyginimas su daugiameèiu vidurkiu, 2004-2005 m.In 2005 the first symptoms of disease were assessed on August 8, spreadof disease was 8.5 % and disease intensity 1% (Fig. 4). Weather conditionswere particularly favorable for the development of downy mildew, as meanday temperatures on August 1-7 were in the range of 15-18.2°C and amountof precipitation more than 2 mm, respectively. This resulted in wetting periods,which are highly favorable for the production and dissemination of spores ofPseudoperonospora cubensis and for disease development in cucumbers. Diseaseprogress was the highest on August 23 because the biggest amount ofprecipitation (11.6 mm) fell on August 21 when mean day temperature was21°C, the mean night temperature was 16.1°C and RH was 93.8%. The spread188