Root Maggot Management Research

Root maggots represent a serious problem for growers of cruciferious vegetables like radish, cabbage, and rutabaga. A series of studies were conducted to evaluate the incidence and severity of damage, chemcial, biological, and integrated management options for this pest.

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2011 Root Maggot Control Trial
Root maggots (Delia radicum) represent a major problem for growers of vegetable cole crops in Saskatchewan. Maggot damage to the roots renders them less capable of delivering the water and nutrients required for optimal growth. In crops grown for their roots (rutabaga and radish), the scars left by the feeding maggots will render the roots unmarketable. Presently the standard approach to controlling maggots is to apply the insecticide chlorpyrifos (Lorsban) as a root drench on several occasions through the growing season. The timing of chlorpyrifos application(s) is targeted to correspond to the development of the maggot population. Application of chlorpyrifos must cease 30 days prior to harvest for rutabaga. Organophosphates like chlorpyrifos have been targeted for phase out as soon as effective reduced-risk alternatives are identified.

2009 and 2010 Root Maggot Control Trial
Root maggots (Delia radicum) represent a major problem for growers of cole crops in Saskatchewan. Maggots damage to the roots renders them less capable of delivering the water and nutrients required for optimal growth. In vegetable crops grown for their roots (rutabaga and radish), the scars left by the feeding maggots make the roots unmarketable. Biological and cultural control practices may reduce problems with maggots but some form of chemical control is usually required.

2003 Control of Flea Beetles and Root Maggots in Diakon Radish and Rutabagas
Root maggots and flea beetles are some of the most significant pests for growers of cruciferous vegetables like radish, rutabaga, and cabbage. This study evaluates a range of the presently approved products for control of flea beetles and root maggots, and examines the efficacy of alternative control options.

2000 Evaluating New Products for Root Maggot Control
Admire (imadochloprid) is a new systemic pesticide presently registered in Canada for the control of Colorado Potato beetles and aphids in potatoes. This study evaluates the effectiveness of Admire for root maggot control in cruciferous vegetables.

1997 Management of Root Maggots in Vegetable Crops
Saskatchewan vegetable growers are finding it increasingly difficult to control damage by root maggots (Delia sp.) utilizing presently registered pesticides or standard production practices. This project examined a range of chemical and cultural control strategies for root maggots in rutabaga.

Powerpoint Presentation: Root Maggot – Biology and Management Options (2.4 MB)
The life cycle andvegetable host range of the root maggot is discussed. Integrated pest management options are also presented.