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Efficacy and persistence of Metarhizium acridum (Hypocreales: Clavicipitaceae) used against desert locust larvae, Schistocerca gregaria (Orthoptera: Acrididae), under different vegetation cover types

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Abstract

The effect of vegetation cover (millet) on the efficacy and conidial persistence of Metarhizium acridum (Driver & Milner) J.F. Bisch., Rehner & Humber was evaluated in semi-field conditions using breeding cages (2 × 2 × 1 m). A mixed population of third- and fourth-instar desert locust larvae, Schistocerca gregaria Forsskål, was used as a target. The insects were exposed in two different vegetation cover types classified as low (about 10%) and high (about 90%). Metarhizium acridum was used at a dose of 2.5 × 1012 conidia/ha in two different application volumes: 1 and 21/ha. Untreated insects kept in contact with treated vegetation were monitored to evaluate the persistence of conidia. The results showed that vegetation cover did not significantly (F = 1.320; P = 0.334) affect the efficacy of M. acridum. Under the high vegetation cover, the increase in the applied volume rate to 21/ha significantly improved the speed of mortality. Conidia persisted 6 days after treatment with a remarkable effect on untreated larvae exposed to the treated vegetation, In addition, the results of this study showed the efficacy of M. acridum in the low vegetation cover. With an important mass of vegetation, M. acridum conidia could persist even under high temperature conditions.

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Authors and Affiliations

  1. Centre National de Lutte Antiacridienne, BP 665, Nouakchott, Mauritanie

    Mohamed Ould Atheimine, Sidi Ould Ely, Cherif Mohamed Habib Kane, Sid’ Ahmed Ould Mohamed & Mohamed Abdallahi Ould Babah

  2. Faculty of Agriculture, University of Khartoum, Shambat, Sudan

    Magzoub Omer Bashir

  3. Laboratoire Agro-alimentaire et santé, Université Hassan 1er, Faculté des Sciences et Techniques, BP 577, Settat, 2600, Maroc

    Mounsif Benchekroun

Authors
  1. Mohamed Ould Atheimine
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  2. Magzoub Omer Bashir
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  3. Sidi Ould Ely
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  4. Cherif Mohamed Habib Kane
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  5. Sid’ Ahmed Ould Mohamed
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  6. Mohamed Abdallahi Ould Babah
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  7. Mounsif Benchekroun
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Correspondence to Mohamed Ould Atheimine.

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Atheimine, M.O., Bashir, M.O., Ely, S.O. et al. Efficacy and persistence of Metarhizium acridum (Hypocreales: Clavicipitaceae) used against desert locust larvae, Schistocerca gregaria (Orthoptera: Acrididae), under different vegetation cover types. Int J Trop Insect Sci 34, 106–114 (2014). https://doi.org/10.1017/S1742758414000228

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