Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 2
Written by Alexandru RANTEȘ
In Romania, maize ranks the first place regarding the cultivated area. In 2019, there were cultivated over 2.68 million ha with maize, with a total production of 17.43 million tonnes. The maize yield is influenced by the climatic conditions, applied crop technology, but also by the pest attack which can have a significant effect on the final yield.The objective of the present paper is to present the effectiveness of different pesticide treatments (seed and vegetation treatments) against the maize leaf weevil (Tanymecus dilaticollis Gyll.) attack in the maize crops from South Romania. The researches were performed under field conditions in South Romania (Giurgiu county, Putineiu location) in 2019. The experimental factors were the followings: Factor A: pesticide seed treatment, with three variants (no pesticide seed treatment; Nuprid AL 600 FS (600 g/l imidacloprid), in dose of 8 l/t of seeds; Actara 25 WG (25% thiametoxam), in dose of 10 kg/t of seeds); Factor B: pesticide treatment in the vegetation period, after plant emergence, with three variants (no pesticide treatment; Mospilan 20 SG (200 g/kg acetamiprid), in dose of 0.1 kg/ha; Actara 25 WG (25% thiametoxam), in dose of 0.1 kg/ha; Lamdex Extra (25 g/kg lambda-cihalotrin), in dose of 0.3 kg/ha); Factor C: maize hybrid, with two variants (Olt hybrid; DKC4351 hybrid).The higher insecticide effectiveness in terms of productivity was registered in the variant with the seed treatment with Nuprid AL 600 FS, with 12,460 kg/ha and with a plant density of 70,536 plants/ha. The highest maize leaf weevil attack was recorded on the control variant with no pesticide treatment applied (no pesticide seed treatment and no insecticide applied in the vegetation period). In the case of spraying insecticides in the first vegetation stages against maize leaf weevil, the higher effectiveness was recorded on the variant treated with Mospilan 20 SG.
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