In Romania, the culture of cabbage (Brassica oleracea) occupies a significant area, 46000 ha, being frequently found in the plain area of the south and west of the country, but also in the hill area of Transylvania and Moldova. The production of this crop is closely related to phytophagous insects. Among these insects, the cabbage white butterfly, Pieris brassicae (Order: Lepidoptera: Family: Pieridae), is an important pest that can heavily infest cabbage crops. The effect of chemical (deltamethrin 100 g/l and cyantranilyprol 100 g/l) and biological (Baccillus thuringiensiss – strain ABTS-351 540g/kg) insecticides on the mortality of Pieris brassicae larvae, the number of plants attacked and the number of leaves that showed attack was studied in Belinț area, Timiş county, in 2021. Each product (treatment) represent a variant, thus the experimental field contained four treatments in three repetitions. The "De Buzău" white cabbage variety was used in the experiment. Phytosanitary treatments were applied when the PED was reached (2-3 larvae/m2). In order to establish the effectiveness of chemical and biological insecticides, evaluations were performed at intervals of 3, 7 and 10 days following application. Following the study, the resoults revealed that the biopeoduct Baccillus thuringiensiss - strain ABTS-351 determined a mortality rate of 67% (3 days after application) in the larval population of Pieris brassicae. At 6 days and 10 days respectively, it was observed that the effectiveness of the bioproduct, Baccillus thuringiensiss -strain ABTS-351, in the control of Pieris brassicae larvae decreases. The chemical insecticides based on deltamethrin 100 g/l and cyantranilyprol 100 g/l, significantly reduced the larval population of Pieris brassicae, the percentages obtained being superior to the biological substance.

Pieris brassicae, control, deltamethrin, cyantranilyprol, Baccillus thuringiensiss -strain ABTS-351, Brassica oleracea

agronomy

Presentation: poster