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Wild Radish

Wild radish plant

Wild radish lvs

Wild radish fl

Wild radish fr

Hairy mustard pl

Hairy mustard fl

Hairy mustard fr

Hairy mustard ros

Hedge mustard pl

Hedge mustard fl & fr

   


BOTANICAL NAME:

Raphanus raphanistrum


Family:

Brassicaceae (crucifers, cabbage and mustard family)

Status

Wild radish is declared noxious in the Southern Tablelands and South East Region only in Goulburn-Mulwaree and Southern Slopes LCAs, in class 4.

description

Wild radish is an annual herb to about one metre high and wide, but often smaller if growing on poor soil such as on road verges. It has bright green basal leaves which are raspy to the touch, with lobes at the base and a single large rounded terminal lobe at the tip. Leaves further up the stems reduce in size and may be unlobed. Flowers are white to pale yellow with brown veins and grow sparsely along tall stems held above the leaves. The fruits are on a 10-25mm long individual stem, held away from the main flowering stem, not pressed against it. When mature they break up into one-seeded sections, and prior to this point they have obvious narrow "necks" between each seed, with a sterile (unswollen) beak at the tip.

Preferred habitat and impacts:

Wild radish competes for space and resources with more desirable plants in crops and pastures, reducing yields or carrying capacity. The seed may become a contaminant of grain or seed crops, or hay. In pasture it taints meat and milk products and has been responsible for stock deaths, of cattle and lambs.

Dispersal:

By wind, water or animals, and in contaminated soil. The main means of spread is as a contaminant of agricultural produce such as hay, and cereal or pasture grass seed.

Look-alikes:

Many members of the brassica family look similar and they can be hard to tell apart. Features to look for are the raspy texture of the leaves and stems, caused by small prickles, the stalked fruits held away from the stem and the veined flowers. The most similar looking, and more common, weed is hairy mustard or Buchan weed (Hirschfeldia incana). It has bright yellow flowers and the fruits are held folded upward against the stem. It is a very common weed of roadsides on both the tablelands and the coast. Hedge mustards (Sisymbrium species) are hairy with long hairs and leaves have narrower, pointed lobes. Flowers are bright yellow.

control

Small infestations should be chipped or spot-sprayed before they set seed. For larger infestations in cropping areas, repeated cultivation or control with selective herbicides preventing the plant from setting seed will eliminate it eventually. In pasture, maintain a vigorous sward with light to moderate grazing and topdress with fertiliser regularly.