Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Emil GEORGESCU, Maria TOADER, Lidia CANĂ, Luxița RÂȘNOVEANU, Leliana VOINEA
Maize leaf weevil (Tanymecus dilaticollis Gyll) is the main pest of the maize crops, mainly in south and south-east of the Romania. Each year, around one million hectares cultivated with maize is attacked by this pest, with different level of the attack intensities. This paper presents the results of researches concerning the effectiveness of the maize foliar treatment with acetamiprid active ingredient, for controlling of the maize leaf weevil, in absence of the seeds treatment with systemic insecticides. The experience were carried out in south-east of the Romania, in favorable area for T. dilaticollis, at NARDI Fundulea, ARDS Marculesti and ARDS Braila, in 2019 and 2020. In case of moderate weevils attack, registered in spring of 2019, the percentage of plants that escaping of the attack ranged from 76.25 to 86.36 % in case of untreated variant, while in case of treated variant, with acetamipird active ingredient, saved plants percent ranged from 77.73 % to 88.12 %. In spring of 2020, the weevils attack at maize plans was low at NARDI Fundulea and ARDS Marculesti, where percentage of the saved plants was higher then 90 %, and moderate at ARDS Braila, when saved plants percent was higher then 77 %. Results from the field trials show that foliar treatment with acetamiprid, don’t provide effective protection of the maize plants, in first vegetation stages (BBCH 10-BBCH 14), against maize leaf weevil attack.
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