Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Emil GEORGESCU, Maria TOADER, Lidia CANĂ, Carmen MINCEA
Maize leaf weevil (Tanymecus dilaticollis Gyll) is the main pest of the sunflower crops, mainly in south and south-east of the Romania. Each year, around one half million hectares cultivated with sunflower is attacked by this pest, with different level of the attack intensities. This paper presents some results of the researches concerning the effectiveness of the sunflower seeds treatments with imidaclopird, clothianidin and thiamethoxam active ingredients, for weevils control, in the climatic conditions from south-east of the Romania, at NARDI Fundulea experimental field. Both, in 2018 and 2019, there weren’t registered significant statistical differences between weevils attack at treated plots. Highest statistical differences concerning weevils attack intensity it has registered between untreated and treated plots (p<0.05). In 2018, at treated plots, saved plants percent ranged from 89.59 to 93.47% while in 2019, the percentage of saved plants, at treated plots, presented lower values comparative with previous year, ranged from 51.67 to 64.17%. A possible reason for this fact is because of higher attack of turnip moth larva (Agrotis spp.) at sunflower plants in 2019 comparative with 2018.
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