Soybean is the plant which provide at a high quality and quantity meantime economically, the nourishments of human and animals as well subsidiary products for industry. Soybean culture, among viruses and bacteriosis is affected as well by damaging fungi like Pseudoperonospora manshurica, who is the main issue of this paper. The study of the behaviour of some soybean breeds at infestation with downy mildew Pseudoperonospora manshurica (Naumov) Syd.In Gaum. was conducted in two experimental years at agricultural farm Agro Iachim SRL. The experience was placed in randomised blocks with 4 variants each three repetitions. The variant surfaces were 25 sqm each. The studied soybean breeds were Triumf (control variant), Danubian, Atlas and Columna. Along vegetation period some treatments with the product Ridomil Glod MZ 68 WG were made. In order to prevent the pathogens Alternaria sp., Botritys sp. And Sclerotinia sp., before blossom stage treatments with Calidan (iprodion 175 g/l + carbendazim 87,5 g/l) were applied. The observation were made beginning with BBCH stadium 60, at 20 days intervals analysing 10 plants, 10 leaves per plant and three leaflets per leaf. The frequency and the attack intensity were analysed and statistically evaluated. A good control degree was obtained by breed Columna which exerted an intensity attack level of 11% as well the breed Triumf where the attack intensity was 50% related to mean of experience.

soybean; pathogen; Peronospora manshurica; attack intensity; control

Presentation: oral