Thomas, M.B. and Wood, S.N. and Langewald, J. and Lomer, C.J. (1997) Persistence of Metarhizium flavoviride and consequences for biological control of grasshoppers and locusts. Pesticide Science, 49 (1). pp. 47-55.
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Abstract
The residual infectivity of an oil formulation of the fungal entomopathogen Metarhizium flavoviride was measured during a field trial against Hieroglyphus daganensis in northern Benin. The pattern of infectivity was shown to decline exponentially following application, with a half-life of 6.8 days. In this environment, infections due to residual spores from the spray were identified as a key route of infection and accounted for 40-50% of the total infection measured 12 days after application. To examine the within- and between-season consequences of such residual infection, a simple host-pathogen model was developed. The model revealed that even very small increases in residual activity could provide large increases in total mortality and that under certain conditions, residual infection was essential for effective pest control. This aspect of the activity of mycopesticides is rarely considered. The implications of these results are discussed in the context of developing optimum spray strategies for locust and grasshopper control under different ecological conditions
| Item Type: | Article |
|---|---|
| Author Affiliation: | Leverhulme Unit for Population Biology and Biological Control, Natural Environment Research Council Centre for Population Biology, Imperial College, Silwood Park, Ascot, Berks SL5 7PY, UK |
| Subjects: | Plant Protection > Control Methods Plant Protection > Pesticides |
| Divisions: | General |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 07 Dec 2011 06:14 |
| Last Modified: | 07 Dec 2011 06:14 |
| Official URL: | http://dx.doi.org/10.1002/(SICI)1096-9063(199701)4... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2819 |
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