WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Friday, May 25, 2018

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4134. McCaffrey, J.P., L.E. O'Keefe, and H.W. Homan. 1986. Cabbage seedpod weevil control in winter rapeseed.. ID Agr. Expt. Sta. CIS #782.
This is the most serious pest of rapeseed; can reduce yield by 35% if not controlled; moves to the flowering crop; mid May to mid June is control window for parathion (0.5 lb/ac a.i.); threshold level estimated at 3-6 adults per sweep.

10709. Sloan, A.J.. 1990. UI evaluating rapeseed as a natural pesticide.. Growers Guide, Nov. 1990, p. A13.
University of Idaho researchers Matt Morra and Paul Brown have identified two active compounds from the breakdown of glucosinolates that occur in rapeseed. Isothiocyante and ionic thiocyante were measured in the soil, where they are effective in suppressing pests such as wireworms. These compounds are produced synthetically for some common soil fumigants.

10719. Sloan, A.J.. 1991. Researchers seeking alternative weevil controls.. Growers Guide, May 1991, p. C4.
The potential loss of parathion for controlling cabbage seed pod weevil on rapeseed or canola could dampen production of this promising alternate crop. The insect can decrease yields up to 30%. Resistant varieties are being developed at the University of Idaho that may be used in conjunction with other biocontrols.

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