Mallow - Giant

Malva spp.

Mallow (Malva spp.) is a term used to describe a group of species. Several of them are difficult to tell apart. Generally, they are described as short-lived perennials meaning the same plant can continue growing for a number of years if conditions favour good growth. If not controlled properly in the first year after germination, control can become more difficult. Generally, older and / or larger perennial plants continue to grow and develop a larger root systems and hardier stems, making the use of higher rates of effective foliar herbicides and good coverage necessary.

Control

Herbicides such as glufosinate do offer some control, but this is limited to browning off the top, leaving a living root system. This allows the plant to regenerate, sometimes in the same year depending on when the herbicide was applied. Glyphosate herbicides such as Roundup Ultra®MAX, when used on mallow, will translocate to the roots, but require a very high rate (2), and/or the addition of a mixing partner to be effective. (Depending on growth stage of the plant). When using Roundup UltraMAX, best results on problem weeds will be achieved by early application on smaller, newly emerged weeds.

Alion herbicide has no knockdown activity and will only control weeds that have germinated from a seed. So, when applied to soil where older mallow plants are present, control of the existing plants will not occur, or be very limited at best. Alion will, however, provide excellent control of mallows that germinate from seed. Best results are obtained by application to bare soil where an effective clean up regime has been implemented. However, weeds such as mallow that still have a living root system, and broad-leaved dock (Rumex obtusifolius) that can re-grow from a root chip, will continue to grow through any ground where Alion has been applied.

Related Pests

Creeping Mallow

Modiola caroliniana

Creeping mallow (Modiola caroliniana) is a mat forming biennial or perennial weed which can be problematic in orchards, turf and gardens. It has a prostrate creeping stems which root at the nodes. Creeping mellow is widespread in the North Island but less common as you go southwards in the South Island.

Mallow - Large Flowered

Malva sylvestris

Malva sylvestris is an upright perennial that can grow to 1.2 metres tall. Leaves are on long stalks, light green, lobed, with toothed margins. Produces large deep pink flowers that arise from leaf axils. Is a problematic weed in orchards and vineyards as it is tolerant to glyphosate.