The Insecticides Effectiveness on Tanymecus Dilaticollis Attack on Maize at NARDI Fundulea

Toader, Maria; Georgescu, Emil; Ionescu, Alina Maria

doi:10.1016/j.aaspro.2016.09.006

Agriculture and Agricultural Science Procedia

2016

DOI: 10.1016/j.aaspro.2016.09.006

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The Insecticides Effectiveness on Tanymecus Dilaticollis Attack on Maize at NARDI Fundulea

Maria Toader

Emil Georgescu

Alina Maria Ionescu

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“…It is a polyphagous species, which is among the most important insect pests of maize and sunflowers in Bulgaria, Romania, Serbia and Hungary (Draganova et al 2012;Georgescu et al 2018a). To date, cultural practices and insecticide applications are the most common management strategies for the grey maize weevil control (Tomov & Yordanov 1984;Toader et al 2016). Re-cently, as a consequence of the restrictions of the European Commission through Regulation (EU) No 485/2013 for the use of specific neonicotinoid insecticides (clothianidin, imidacloprid and thiamethoxam) and Regulation (EU) No 781/2013 for the use of the pyrazole fipronil, including their use for seed treatment to control early-season pests, the majority of the applied insecticides for T. dilaticollis control were withdrawn from the market.…”

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confidence: 99%

Effect of bioinsecticides on the grey maize weevil Tanymecus dilaticollis

Toshova¹,

Velchev²,

Pilarska³

et al. 2021

Plant Prot. Sci.

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Tanymecus dilaticollis is an important pest of maize and sunflowers in eastern Europe. In the present study, we examined the effectiveness of two commercially available bioinsecticides against T. dilaticollis adults under laboratory conditions: Naturalis® based on the Beauveria bassiana fungus and an azadirachtin-based botanical product NeemAzal T/S®. Our results suggested that adults of the pests are more susceptible to B. bassiana than to azadirachtin. Naturalis®, tested at six concentrations (2.3 × 102 – 2.3 × 107 conidia/mL), showed a high lethal effect to T. dilaticollis adults, and 100% corrected mortality was observed in the treatments over 2.3 × 105 conidia/mL and 2.3 × 106 conidia/mL for females and males, respectively. NeemAzal T/S®, tested at four concentrations (0.5, 1, 2 and 4%) with two treatments, caused generally low to moderate mortality – 6–44% within 16 days. A field experiment consisted of two sprayings of maize experimental plots with Naturalis® at a rate of 200 mL/0.1 ha and then the recording the number of dead adults of T. dilaticollis in the treated and control plots was conducted in north-western Bulgaria. Twenty days after treatment, a significantly higher mean mortality of the pest caused by the mycoinsecticide than in the control variants was registered.

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mentioning

confidence: 99%

Effect of bioinsecticides on the grey maize weevil Tanymecus dilaticollis

Toshova¹,

Velchev²,

Pilarska³

et al. 2021

Plant Prot. Sci.

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Evaluation of Beauveria bassiana and Beauveria pseudobassiana Against Tanymecus dilaticollis

Fătu¹,

Georgescu²,

Iamandei³

et al. 2023

RAR

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The grey corn weevil, Tanymecus (Episomecus) dilaticollis Gyll., (Curculionidae: Entiminae) is the most destructive pest of maize and sun flower crops in Romania. In this article we report result of evaluation of native strains of entomopathogenic fungus Beauveria bassiana (Bals.) Vuill. (Deuteromicotina: Hyphomycetes) and B. pseudobassiana Rehner et Humber against Tanymecus dilaticollis (Curculionidae: Entiminae) both in laboratory and field. In laboratory assay, two different strains of B. bassiana and one strain of B. pseudobassiana (BbLy) were applied on insects as 1×108 conidia/ml aqueous suspensions. The pure ATCC 74040 commercial strain of B. bassiana and the commercial mycoinsecticide based on this strain (Naturalis) were included in the laboratory assay for comparison. Adult mortalities were recorded daily, 14 days post-exposure. All the fungal strains have been shown to be pathogenic to T. dilaticollis. The B. bassiana strain (BbTd1) and the B. pseudobassiana strain (BbLy) were effective against adults of T. dilaticollis and comparable in percentage of mycosis and virulence to the B. bassiana strain ATCC 74040. The commercial product Naturalis was superior to the tested fungal strains killing the insects within a day. In the field, the strains BbTd1 and BbLy applied as conidia multiplied on barley grains (1×109 /g d.w) in the soil did not affect the T. dilaticollis density in maize crop.

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The Insecticides Effectiveness on Tanymecus Dilaticollis Attack on Maize at NARDI Fundulea

Cited by 2 publications

References 1 publication

Effect of bioinsecticides on the grey maize weevil Tanymecus dilaticollis

Effect of bioinsecticides on the grey maize weevil Tanymecus dilaticollis

Evaluation of Beauveria bassiana and Beauveria pseudobassiana Against Tanymecus dilaticollis

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