Compared effects of Metarhizium anisopliae ICIPE 69 and Chlorpyriphos-ethyl on the mango mealybug, Rastrococcus invadens Williams (Homoptera : Pseudococcidae) and its parasitoids in western Burkina Faso

  • Karim Nebie
  • Souleymane Nacro
  • Rémy A. Dabire
  • Lenli Claude Otoidobiga
Keywords: Mango mealybug, biological control, entomopathogenic fungus, parasitoids, Burkina Faso

Abstract

This study was carried out to evaluate the effects of the bio pesticide Metarhizium anisopliae ICIPE 69 and the chemical pesticide Chlorpyriphos-ethyl on Rastrococcus invadens and its parasitoids Anagyrus mangicola and Gyranusoidea tebygi in orchards. A Randomized Complete Block design consisting of 5 treatments was set up in Mahon and Niampédougou. There were the untreated control, the reference chemical Chlorpyriphos-ethyl (480 g/l) and 3 doses of the bio pesticide (108 conidia/ml, 109 conidia/ml and 2.109 conidia/ml). Live or dead mealybugs were counted on 20 leaves/mango trees before the first application of the chemicals and then successively each week for 3 to 4 weeks. Highest mortality rates of mealybugs were observed with Chlorpyriphos-ethyl (50-90%) followed by the higher dose of the bio pesticide (28-40%). The level of parasitoids expressed in log (N + 1) was low (0-0.86) on trees treated with Chlorpyriphos-ethyl compared to bio pesticide (0.15-1.86) and untreated control (0.33-1.53). Significant differences (0.047≤P<0.001) were observed between treatments after the first application of the chemicals. Although the rate of mortality of mealybugs was twice as high with Chlorpyriphos-ethyl, M. anisopliae ICIPE 69 could be an alternative to synthetic insecticides for compatibility with parasitoids.

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Keywords: Mango mealybug, biological control, entomopathogenic fungus, parasitoids, Burkina Faso

Published
2019-02-22
Section
Articles

Journal Identifiers


eISSN: 1997-342X
print ISSN: 1991-8631