caa a22 4500 388093315 CHVBK 20180307125257.0 cr unu---uuuuu 161130e199906 xx s 000 0 eng 10.4039/Ent131387-3 doi S0008347X00009998 pii (NATIONALLICENCE)cambridge-10.4039/Ent131387-3 DISTRIBUTION AND SEASONAL ABUNDANCE OF SITODIPLOSIS MOSELLANA (DIPTERA: CECIDOMYIIDAE) IN SPRING WHEAT [Elektronische Daten] The wheat midge Sitodiplosis mosellana (Géhin) occurred in all wheat-growing areas of Manitoba during 1993-1997, with 95% of spring wheat fields having some seeds infested by larvae. The level of infestation varied, but each year in excess of 20% of seeds were infested in some fields. Infestation levels in adjacent fields were more similar than in fields separated by a few kilometres. Within fields, the infestation was similar at the edge and near the centre. Wheat midge larvae also overwintered in, and adults emerged from, fields in all wheat-growing areas of Manitoba. Adults emerged from the end of June to the end of July most years, and the peak period for adult flight was mid-July, about 1 month later than in parts of Europe where winter wheat predominates. The timing of the emergence was similar from place to place and year to year. Females constituted 95% of insects caught in a flight trap. The first 10% and 50% of the flight occurred on 9 and 16 July, respectively, and the timing of the flight was not related to growing degree-days. In early August, mature larvae began dropping from wheat heads. The timing of infestation of spring wheat was variable among years because of differences in timing between midge flights and the susceptible heading stage of the crop. Nevertheless, the wheat midge flight usually coincided with the susceptible stage of the spring wheat crop. Copyright © Entomological Society of Canada 1999 Lamb R.J. Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9 Wise I.L. Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9 Olfert O.O. Research Centre, Agriculture & Agri-Food Canada, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N OX2 Gavloski J. Soils and Crops Branch, Manitoba Agriculture, P.O. Box 1149, Carman, Manitoba, Canada ROG OJO Barker P.S. Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9 The Canadian Entomologist Cambridge University Press 131/3(1999-06), 387-397 0008-347X 131:3<387 1999 131 TCE https://doi.org/10.4039/Ent131387-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131387-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lamb R.J. Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9 NATIONALLICENCE 700 1- Wise I.L. Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9 NATIONALLICENCE 700 1- Olfert O.O. Research Centre, Agriculture & Agri-Food Canada, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N OX2 NATIONALLICENCE 700 1- Gavloski J. Soils and Crops Branch, Manitoba Agriculture, P.O. Box 1149, Carman, Manitoba, Canada ROG OJO NATIONALLICENCE 700 1- Barker P.S. Cereal Research Centre, Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/3(1999-06), 387-397 0008-347X 131:3<387 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge