Canadian Forest Service Publications
Diel activity patterns of Paradiplosis tumifex (Diptera: Cecidomyiidae) and its inquiline, Dasineura balsamicola (Diptera: Cecidomyiidae), within young balsam fir. 2014. Carleton, R.D.; Johns, R.C.; Edwards, B.V.; Eveleigh, E.S.; Silk, P.J. The Canadian Entomologist : online early.
Issued by: Atlantic Forestry Centre
Catalog ID: 35678
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Field studies were carried out to assess diel activity patterns of the balsam gall midge, Paradiplosis tumifex Gagné (Diptera: Cecidomyiidae) in 2012, and its inquiline, Dasineura balsamicola (Lintner) (Diptera: Cecidomyiidae) in 2013, in a young balsam fir (Abies balsamea (Linnaeus) Miller) stand in New Brunswick, Canada. Both gallmaker and inquiline are most active during the afternoon/evening hours (17:00–22:00 hours). Male gallmaker activity was largely confined to the space below the crown and typically involved short periods of flight of <30 seconds. Calling and mating by the gallmaker occurred at ground level and were followed by dispersal of females to the vegetative crown. Female gallmakers were typically observed in the tree crown beginning in early afternoon, with peak oviposition occurring between 20:00 and 21:00 hours. Female inquilines displayed similar activity patterns, although no calling or mating were observed. Moreover, inquiline flight and foraging for oviposition sites were more active than the gallmaker, with shorter rest periods and more buds visited than the gallmaker. Our results indicate that population monitoring should focus on female gallmakers as they fly during the evening. Also, before any treatment application, care should be taken to accurately identify the insects to ensure that the inquiline is not inadvertently killed.
Plain Language Summary
Accurate detection methods are essential to integrated pest management programs aimed at controlling insect pests. In particular, knowledge of where and when and insect pest is active, and what they are doing, can greatly improve our ability to both detect and treat an insect outbreak. Our study provides daily activity patterns for a major insect pest of Christmas tree crops in the Maritime region, the balsam gall midge, as well as a closely related competitor that often kills the midge through appropriating its feeding chamber. From this information we provide recommendations for increasing the precision and efficiency of field surveys for adult balsam gall midge.