Abstract
Abstract Early weed removal in canola gives the crop a competitive advantage over weeds and is therefore widely recommended for optimal crop production, but no studies have been undertaken previously to determine the effect of this practice on insect infestations. Four field experiments were conducted at Lacombe and Beaverlodge, AB, Canada, in 1999–2001 for a total of 10 site-years to determine the effect of time of weed removal on root maggot (Delia spp.) egg deposition and larval damage to taproots. The experiments also investigated the effects of other factors such as cultivar, seeding date, herbicide application rate, fertilizer rate and placement, and use of a nitrification inhibitor on root maggot damage and oviposition. Damage to taproots and oviposition declined by approximately 6 and 23%, respectively, with a delay in weed removal from the two- to six-leaf stage of canola development. The effect of time of weed removal on root maggot damage and egg density sometimes varied with site and cultivar,...
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