caa a22 4500 388105399 CHVBK 20180307125336.0 cr unu---uuuuu 161130e199912 xx s 000 0 eng 10.1017/S1742758400018956 doi S1742758400018956 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400018956 The First Trial of a Metarhizium anisopliae var. acridum Mycoinsecticide for the Control of the Red Locust in a Recognised Outbreak Area [Elektronische Daten] The outbreak areas of the red locust are seasonally inundated wetland areas supporting a rich biodiversity. The potential for environmental damage from the repeated use of broad-spectrum insecticides for locust control in these ecologically sensitive wetlands is therefore great. This paper describes the first trial of a Metarhizium anisopliae var. acridum (LUBILOSA isolate IMI 330189) mycoinsecticide as an alternative, more environmentally benign, intervention strategy for managing red locust populations in their outbreak areas. Following initial bioassay tests in the laboratory, which gave 90-93% kill of 3rd instar hoppers within 6-9 days, an oil based formulation of aerial conidia was applied at a rate of 5 × 1012 conidia/ha using a motorised ‘Solo' knapsack sprayer to treat 3rd and 4th instar hopper bands in the Buzi outbreak area near Beira in Mozambique. Caged samples of 3rd instars succumbed quickly with a median time to kill of 3.6-3.9 days and 98-100% kill recorded within 8-9 days. The 4th instars took longer to die, with a median lethal time of 5.9-6.1days and > 90% mortality after 21 days. Mortality in control samples was low with 13-23% mortality after 21 days. During this mortality assessment period mean minimum and maximum air temperatures ranged from 26-34°C and relative humidity ranged from 85-100%. Observations on treated bands in the field showed that the cohesion of the 3rd instar bands broke down within 6 days, while controls still behaved normally. Unfortunately observations on the 4th instar band had to be terminated after 10 days due to heavy flooding. This preliminary field trial demonstrated the feasibility of using a Metarhizium mycoinsecticide, applied through conventional spray equipment, for controlling the red locust in its outbreak areas. Copyright © ICIPE 1999 criquet rouge nationallicence Nomadacris septetnfasciata nationallicence Metarhizium anisopliae var. acridum nationallicence myco-insecticide essai biologique en laboratoire nationallicence essais en champs nationallicence red locust nationallicence Nomadacris septemfasciata nationallicence Metarhizium anisopliae var. acridum nationallicence mycoinsecticide nationallicence laboratory bioassay nationallicence field trials nationallicence Price R. E. ARC-Plant Protection Research Institute, Private Bag X134, Pretoria 0001, South Africa Müller E. J. ARC-Plant Protection Research Institute, Private Bag X134, Pretoria 0001, South Africa Brown H. D. ARC-Plant Protection Research Institute, Private Bag X134, Pretoria 0001, South Africa D'Uamba P. Departmento de Sanidade Vegetal, Direccão Nacional de Agricultura, Caixa Postale 3658 Maputo, Mozambique Jone A. A. Departmento de Sanidade Vegetal, Direccão Nacional de Agricultura, Caixa Postale 3658 Maputo, Mozambique International Journal of Tropical Insect Science Cambridge University Press 19/4(1999-12), 323-331 1742-7584 19:4<323 1999 19 JTI https://doi.org/10.1017/S1742758400018956 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400018956 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Price R. E. ARC-Plant Protection Research Institute, Private Bag X134, Pretoria 0001, South Africa NATIONALLICENCE 700 1- Müller E. J. ARC-Plant Protection Research Institute, Private Bag X134, Pretoria 0001, South Africa NATIONALLICENCE 700 1- Brown H. D. ARC-Plant Protection Research Institute, Private Bag X134, Pretoria 0001, South Africa NATIONALLICENCE 700 1- D'Uamba P. Departmento de Sanidade Vegetal, Direccão Nacional de Agricultura, Caixa Postale 3658 Maputo, Mozambique NATIONALLICENCE 700 1- Jone A. A. Departmento de Sanidade Vegetal, Direccão Nacional de Agricultura, Caixa Postale 3658 Maputo, Mozambique NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 19/4(1999-12), 323-331 1742-7584 19:4<323 1999 19 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge