Researches Concerning Effectiveness of the Seed Treatment in Maize Crop for Controlling the Maize Leaf Weevil ( Tanymecus dilaticollis Gyll ) at NARDI Fundulea

Abstract

In this paper, author collective present results and methodology of the insecticides testing against maize leaf weevil, in laboratory conditions. Year by year at NARDI Fundulea, in field conditions, it has tested insecticides used both like seed and vegetation treatment for control ling of the maize leaf weevil. Because climatic conditions from the spring are not favorable for this pest every year, laboratory testing is one of the best methods for evaluate of the insecticides used like seed treatment. At eight days after insects are added in the pots with maize plants, highest adults mortality and lowest attack intensity has registered in case of plants emerged from the seeds treated with products on base of thiametoxan ( Cruiser 350 FS ) , clothianidin ( Poncho 600 FS ) or thiametoxan+teflutrin ( Force Zea ) . In case of seeds treated with product on base of imidacloprid ( Nuprid 600 FS 8,0 l/t ) , even if the insects mortality was lower, the attack intensity has low values. All plants from the untreated variant were destroyed. At treated variants, saved plants percent were at least 90 %. Seed treatments provide a satisfactory protection of the maize plants, in first vegetation stages against maize leaf weevil.

Efficacy of Trichoderma Harzianum and Bacillus Subtilis as Seed and Vegetation Application Combined with Integrated Agroecology Measures on Maize

“…The caried observations have been adapted for farming participatory evaluation. It was assessed the plant density of plots, a broad plant attack frequency of pests, especially the maize leaf weevil (Tanymecus dillaticolis), one of the most dangerous pests for maize in Romania (Georgescu et al, 2021). Also the weeds distribution, as percent on the plot and the species encountered (Ionescu et al, 2021).…”

Research Concerning the Effectiveness of the Entomopathogenic Fungi for Controlling the Maize Leaf Weevil (Tanymecus Dilaticollis Gyll) in the Greenhouse Conditions

“…After the ban of the seed treatment and foliar application of the neonicotinoids active ingredients, as a result of the European Commission regulations 218/783, 218/784, and 218/785 (Official Journal of the European Union, 2018a,b,c), no alternative remain available in Romania for maize seed treatment to control maize leaf weevil attack. In the last years, several studies have been made, both in experimental fields and commercial farm conditions, to find alternatives to banned neonicotinoids active ingredients used in maize seed treatment (Georgescu et al, 2018(Georgescu et al, , 2019(Georgescu et al, , 2021(Georgescu et al, , 2022Trașcă F. et al, 2019;2021;Toader et al, 2020;Amuza et al, 2021;Trașcă G. et al, 2021). All the alternatives studied in these researches have lower or zero effectiveness in controlling maize pests when plants are in early vegetation stages, including maize leaf weevil (T. dilaticollis).…”

The Behavior of Some Sunflower Hybrids to White Rust (Albugo tragopogonis) under Brăila County Conditions

“…Sunflower (Helianthus annuus) is a known host for over 36 pathogenic organisms, mostly fungi, that can cause serious economic losses, depending on the climatic conditions (Gulya et al, 1997b). Also, soil pests can reduce sunflower yield (Georgescu et al, 2018(Georgescu et al, , 2020. The fungal foliar diseases, leaf spot which are caused by Alternaria helianthi, Septoria helianth, Albugo tragopogonis and Plasmopara halstedii by inducing brown and grey spots, white rust and downy mildew are relatively important (Van Wyk et al, 1999;Achbani et al, 2000;Masirevic and Jasnic, 2006).…”