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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

Published online by Cambridge University Press:  29 May 2014

Mohamed Ould Atheimine ,
Magzoub Omer Bashir ,
Sidi Ould Ely ,
Cherif Mohamed Habib Kane ,
Sid' Ahmed Ould Mohamed ,
Mohamed Abdallahi Ould Babah  and
Mounsif Benchekroun
Mohamed Ould Atheimine*
Affiliation:
Centre National de Lutte Antiacridienne, BP 665, Nouakchott, Mauritanie
Magzoub Omer Bashir
Affiliation:
Faculty of Agriculture, University of Khartoum, Shambat, Sudan
Sidi Ould Ely
Affiliation:
Centre National de Lutte Antiacridienne, BP 665, Nouakchott, Mauritanie
Cherif Mohamed Habib Kane
Affiliation:
Centre National de Lutte Antiacridienne, BP 665, Nouakchott, Mauritanie
Sid' Ahmed Ould Mohamed
Affiliation:
Centre National de Lutte Antiacridienne, BP 665, Nouakchott, Mauritanie
Mohamed Abdallahi Ould Babah
Affiliation:
Centre National de Lutte Antiacridienne, BP 665, Nouakchott, Mauritanie
Mounsif Benchekroun
Affiliation:
Laboratoire Agro-alimentaire et santé, Université Hassan 1er, Faculté des Sciences et Techniques, BP 577, Settat2600, Maroc
*
*E-mail: mohamed.atheimine@gmail.com
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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 2 l/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 2 l/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.

Keywords

Schistocerca gregariaMetarhizium acridumconidial persistencevegetation cover
Type
Research Papers
Information
International Journal of Tropical Insect Science , Volume 34 , Issue 2 , June 2014 , pp. 106 - 114
Copyright
Copyright © ICIPE 2014 

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