NDLI: Combined field efficacy of Paranosema locustae and Metarhizium anisopliae var. acridum for the control of sahelian grasshoppers

Content Provider	Springer Nature Link
Author	Touu, Agbeko Kodjo Kooyman, Christiann Douro Kpindou, Ouro Kobi Poehling, Hans Michael
Copyright Year	2007
Abstract	Field trials were conducted to evaluate the efficacy of wheat bran bait formulations of Paranosema locustae and Metarhizium anisopliae for controlling grasshoppers in southeast Niger. Treatments consisted of wheat bran baits mixed with M. anisopliae, P. locustae + M. anisopliae or with P. locustae spores and P. locustae + sugar. Oedaleus senegalensis, Pyrgomorpha cognata and Acrotylus blondeli were the predominant species at the time of application representing ca. 94% of the total population. Bran application was done when O. senegalensis (ca. 75% of the population) was at its early developmental stages, with first, second and third instars accounting for 64–85%. Grasshopper population reduction, P. locustae prevalence and level of infections in the predominant species were monitored. Manual application of P. locustae and M. anisopliae formulated in wheat bran has proven to induce consistent pathogen infection in grasshopper populations. Population density over the three weeks monitoring, typically decreased by 44.7 ± 6.9%, 52.8 ± 8.4%, 73.7 ± 5.5% and 89.1 ± 1.8% in P. locustae, P. locustae + sugar, M. anisopliae and P. locustae + M. anisopliae treated plots respectively. Paranosema locustae prevalence in surviving adult grasshoppers at 28 after application was 48.1 ± 2.3%, 28.9 ± 4.8% and 27.4 ± 3.7%, with infection level of 6.2 ± 0.8 × 106, 2.3 ± 0.3 × 104 and 2.1 ± 0.3 × 103 spores mg−1 host weight in O. senegalensis, A blondeli and P. cognate respectively. Other species that each accounted for <2% of the community, namely Aiolopus thalassinus, A. simulatrix, Acorypha glaucopsis, Acrotylus patruelis, Anacridium melanorhodon, Diabolocatantops axillaris, Kraussaria angulifera and Schistocerca gregaria were found to show sign of infection. The results from this study suggest that wheat bran application of M. anisopliae and P. locustae alone or in combination, targeting early instars grasshopper could be a valuable option in grasshopper control programs.
Starting Page	813
Ending Page	828
Page Count	16
File Format	PDF
ISSN	13866141
Journal	BioControl
Volume Number	53
Issue Number	5
e-ISSN	15738248
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-12-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biological control Density reduction Disease prevalence Grasshoppers Metarhizium anisopliae Paranosema locustae Behavioural Sciences Animal Biochemistry Animal Ecology Agriculture Plant Pathology Entomology
Content Type	Text
Resource Type	Article
Subject	Insect Science Agronomy and Crop Science

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