Seed Certification Manual - Rural Solutions SA - SA.Gov.au

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South Australian Seed Certification Scheme 10.2 PROHIBITED AND DECLARED WEEDS IN THE S.A. SEED CERTIFICATION SCHEME PROHIBITED African daisy African rue African feathergrass African lovegrass African boxthorn Alkali sida Alligator weed Arrowhead Azzarola Ball mustard Bathurst burr Bifora Blackberry Black bindweed Bladder campion Boneseed Bridal creeper Broom rapes Bubil watsonia Buchan weed Californian burr Calomba Daisy Caltrop Cape tulip Cleavers or bedstraw Creeping knapweed Cutleaf mignonette Dodder Dog rose Elodea or Canadian pondweed English broom False caper Field bindweed Field garlic Gorse or furze Hemlock Hoary cress Horehound Hydrocotyle Indian hemp Innocent weed Johnson grass Khaki weed Lagarosiphon PROHIBITED Leafy elodea Leafy spurge Lincoln weed May (Hawthorn) Mesquite Montpellier or cape broom Muskweed Nightstock Noogoora burr Nutgrass Onion weed Parkinsonia Parthenium weed Perennial ragweed Perennial thistle Poison ivy Prickly pear Ragwort Rampion mignonette Rhus tree Sagittaria Salvation Jane Salvinia Senegal tea plant Serrated tussock Shore thistle Silverleaf nightshade Skeleton weed Small fruited pheasant's eye Soldier thistle Soursob St. John's wort Star of Bethlehem Sweetbriar Three-corner jack Three-cornered garlic Variegated thistle Vipers bugloss Water dropwort Water hyacinth Wild artichoke Wild radish Yellow burrweed DECLARED Buffalo burr Bulbous oatgrass Burrgrass Charlock Docks Fennel Gallon's curse Glaucous star thistle Italian bugloss King Island Melilot Mexican poppy Mossman river grass Poverty weed Saffron thistle Slender thistle Spear thistle St Barnaby's thistle Star thistle Stemless thistle Topped lavender Wards weed Wild mignonette Wild turnip
South Australian Seed Certification Scheme 10.3 APPLYING ISOLATION STANDARDS FOR CERTIFIED LUCERNE SEED PRODUCTION To be eligible for certification, lucerne stands must be sufficiently isolated from other crops of lucerne to reduce the risk of contamination with undesirable pollen. The 50 metre rule OECD certification requires that: • For stands greater that 2 hectares: Certified seed crops should be at least 50 metres from any other lucerne cultivar. Basic seed crops should be at least 100 metres from any other lucerne cultivar. • For stands smaller than 2 hectares - these distances are doubled. However, in some instances, the isolation distance for crops producing certified classes of seed may be as little as three (3) metres by applying the 10% isolation rule. The practical application of this rule depends in part on the size of the seed paddock and the length of the common borders between lucerne crops growing in adjacent fields. The 10% isolation rule For certified stands a minimum isolation distance of three (3) metres is permitted provided the area of crop growing within the 50 metre isolation zone (adjacent to another lucerne cultivar) represents no more than 10% of the crop to be certified. This figure can be calculated by using the following formula: Isolation zone (m²)* x 100% Paddock size (m²) * = length of common borders (m) x (50m minus any existing isolation width present) Interpreting the 10% rule In general - the larger the crop, and the shorter the common border, the more likely the 10% rule will apply; ie. an isolation distance of three (3) metres only between different lucerne cultivars will be required. This minimum distance can be further reduced provided a physical barrier such as a fence line, channel or check bank separates the adjacent crop areas. What happens to the Isolation Zone? An isolation zone must be cut for hay or kept mown during the flowering period or The isolation zone may be left and harvested as uncertified seed provided the following procedure is followed: • The area to be harvested as uncertified seed is clearly pegged or defined. • If two certified cultivars are growing in adjacent paddocks - and the 50 metre rule applies to both crops - an area of 50 metres from the common border must be pegged out in both cultivars and harvested as uncertified seed. • Uncertified seed must be harvested last. Please note that the Certification Office may require the grower to provide full details and evidence of any uncertified seed harvested from an isolation zone. Failure to provide this information in a timely manner may result in all seed lines grown from the crop being withheld from final certification or rejected. Seed Services retains the right to make inquiries of any other third parties in verifying the production of uncertified seed. Think carefully about where you establish a lucerne stand Obviously it makes sense to plan where you establish lucerne stands with isolation requirements in mind - and where applicable consider what cultivars your neighbour may be growing in adjacent paddocks - as this may help minimise the impact isolation zones will have on your certified seed production. Assistance If you require assistance in determining isolation distances please contact your nearest Seed Certification office or accredited lucerne seed crop inspector.
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Seed Certification Manual - Rural Solutions SA - SA.Gov.au

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