Reduction of consumption by grasshoppers (Orthoptera: Acrididae) infected with Nosema locustae canning (Microsporida: Nosematidae) |
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| Affiliation: | 1. Agriculture Canada, Research Station, Lethbridge, Alberta T1J 4B1, Canada;1. Alberta Agriculture, Agriculture Center, Lethbridge, Alberta T1J 4C7, Canada;1. INRA, UMR AGIR 1248, 24 Chemin de Borde Rouge—Auzeville, CS 52627, 31326 Castanet Tolosan Cedex, France;2. Institut de Recherche pour le Développement, UMR DIADE, 911 Avenue Agropolis, 34394 Montpellier Cedex 5, France;1. Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, 1 Airport Road, Swift Current, SK, S9H 3X2, Canada;2. Quebec Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Boulevard, Quebec, QC, G1 V 2J3, Canada;1. The Rural Economy and Agricultural Society, HS Konsult AB, Box 271, SE-701 45 Örebro, Sweden;2. Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Box 234, SE-521 32 Skara, Sweden;1. Thünen Institute of Organic Farming, Federal Research Institute for Rural Areas, Forestry and Fisheries, Trenthorst 32, 23847 Westerau, Germany;2. University of Kassel-Witzenhausen, Organic Farming and Cropping Systems, Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany |
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| Abstract: | The effect of ingestion of Nosema locustae Canning spores on feeding by grasshoppers was measured in simultaneous laboratory and field experiments. After 21 days, fourth-instar Melanoplus sanguinipes (F.) nymphs, administered spores at the rates of 0, 2.0 × 104, 2.0 × 105, and 2.0 × 106 per grasshopper, showed dry matter consumption of 102, 87, 64, and 26 mg in 48 hr, respectively. Rate of inoculation was a significant factor in suppression of feeding after correction for the effects of developmental stage, sex, and body weight. The quantity of dry matter consumed decreased linearly with increasing rate of spore ingestion. Experiments on 50 caged 1-m2 plots on pasture grass yielded similar trends in per capita consumption independent of the effects of mortality. Field consumption per integrated grasshopper-day was 108, 77, 31, and 27 mg dry wt at the four inoculation rates, over 20 days. |
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