Chemical control of cucumber damping off caused by Pythium aphanidermatum

Damping off of cucumber caused by Pythium aphanidermatum (Edson) Fitzp. Usually appears when climatic conditions especially high humidity and favorable temperature are available and also in the lack of crop rotation. In the present study efficacy of some fungicides inctuding Propamocarb hydrochloride (Proplant722sl®), Metalaxyl (Ridomyl GR 5 %®) and Bordeaux Fix (SC 18 %®) on control of cucumber damping off was investigated in nursery and greenhouse. The effect of Propamocorb hydrochloride with dosages 0.75, 1 and 1.25 ml/1000 was compared whit Metalaxyl G2.5g/m2, Bordeaux Fix Sc5 mg/1000 and control (without fungicide) using a completely randomized designe.Simple and combined analysis of variance was carried out by SAS soft ware. The results showed that the percentages of cucumber seeding’s damping off in nursery and greenhouse were significantly different among the fungicides with apphed dosages. In nursery, Propamocarb hydrochloride 1ml/1000 with 7.62% damping off had the highest effect on disease control and Bordeaux Fix with 41.50% damping off had the lowest effect compared to the other fungicides and control treatments. In greenhouse, the highest and lowest percentages of damping off (45.00% and 3.75%, respectively) were recorded in propamocarb hydrochloride 0.75 m/1000 and metalaxyl 2.5g/m2 treatments.