Science Into Practice - Weed control for narcissus

The use of herbicides after cropping in narcissus production is important because weeds germinate after the soil has been disturbed by pickers.

Weeds have the greatest impact if uncontrolled after flowering, when the bulbs begin floral initiation.

HDC project BOF 73 looked at herbicide use post-cropping and at alternative persistent residual products to apply in the dormant period to avoid pre-cropping treatments.

Trials were undertaken in a commercial crop of Tamsyn that was in its second year in 2011. In terms of post-cropping treatments, three herbicide tank mixes appeared effective.

Stomp Aqua + Kerb Flo produced little or no damage and while effective against fat-hen, groundsel was not controlled. Wing-P + Barton WG was safe and gave the best weed control. Butryflow + Stomp Aqua appeared very safe and gave some pre-emergence control of groundsel.

In dormant-stage treatments, the product Chikara appeared very safe at the single-dose rate and was the most persistent but also most expensive and is not currently permitted in the presence of a crop or on land to be cropped.

An Intruder + Sencorex SC treatment was effective and safe and similar in cost to the industry standard treatment (Intruder + Linurex 50SC). Jouster and Cadou Star, applied as individual treatments, were safe but less effective.

Tamsyn is an early variety that, in 2011, emerged early after a mild autumn. No other herbicide application would have been required at pre-cropping following any of the residual treatments.

Horticultural Development Company

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