GNN120319

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Volume 38, Number 8 | March 19, 2012

$4.25

PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER

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Guidelines for seed treatment It can be hard to know if you’ll get value for the money and time spent treating your seed. Information from the Saskatchewan’s plant disease specialist may help BY LEEANN MINOGUE

T

reating your seed before you put it in the ground is a bit like buying an insurance policy. There will always be times when you treat seed that maybe didn’t strictly need to be treated, but there will also be years that treating seed pays off in a big way.

MAKING THE DECISION The Saskatchewan Pulse Growers (SPC) holds regional pulse meetings across Saskatchewan every winter. Faye Dokken-Bouchard, Saskatchewan Agriculture’s plant disease specialist, recently spoke at one of these SGP meetings in Weyburn, Sask. As part of her presentation about integrated disease management, Dokken-Bouchard talked about using infection thresholds to decide whether to treat infected seed, and whether it should be planted at all. The two tables on page four are a summary of that part of DokkenBouchard’s presentation (you can see the entire presentation online at the SPG’s website at www.saskpulse.com). The numbers in the tables are just guidelines — there are no firm rules or researchbased recommendations when it comes to planting infected seed. However, along with these guidelines, your decision about whether to use seed should be based on a number of factors. according to Saskatchewan Agriculture’s seed-borne disease fact sheets: • The cost and availability of disease-free seed with good germination. If you’re buying pedigreed seed, the seed certificate of analysis will tell you if disease is present. If you’re using your own seed, have it tested. • The cost and availability of registered seed treatments. The provincial seed guides list recommended treatments for various crops and diseases.

• The weather conditions and disease pressure typical for your region or soil. Temperature can have a big impact on disease. If you’re seeding into soil that’s cooler than 5 C, emergence may be delayed. This gives soil- and seed-borne disease a chance to establish itself. • The class and/or variety of seed. Some varieties are more resistant to certain diseases that others. • The type of disease pathogen. If the disease is likely to cause significant yield loss or downgrading, seed treatments will make more sense. • Availability and potential application of foliar fungicides. In some cases, pathogens can be dealt with later, if they appear in the field.

ROOT ROT One of the diseases included in the guideline tables is root rot. This pathogen is soil-borne so won’t show up in your seed lot, but you may wish to protect your seed with seed treatment anyway. Dokken-Bouchard says, “If you’ve had problems in the past, you might want to treat it.” Many Prairie farmers may have problems. Dokken-Bouchard told the Weyburn audience that root rot was observed in 88 per cent of lentil fields surveyed in 2011. If you’re concerned about root rot, you might want to give extra consideration to treating kabuli chickpeas, low-tannin lentils and damaged or cracked peas.

PHOTOS: CANADIAN GRAIN COMMISSION

When wheat is damaged by fusarium, kernels will appear thin or shrunken. This photo appears courtesy of the Canadian Grain Commission. and seedling emergence. And, as Dokken-Bouchard pointed out in her presentation, using infected seed can introduce fusarium into a field where it hadn’t been before. It can linger there, and cause problems later. Among the various strains of fusarium that can cause fusarium

Here are four recommendations for coping with fusariuminfected seed. 1. If you live in a region where fusarium graminearum is not common, don’t bring seed into your area from a region that already has the infection. 2. If your seed lot is infected

FUSARIUM IN CEREALS: Whether or not to use their seed can be a tough call for farmers with fusarium-infected seed lots. Seed with a high level of fusarium could still have a high level of germination, in cases where the infection hasn’t penetrated all the way to the seed embryo. There is (so far) no evidence that planting fusarium-infected seed will increase your risk of fusarium head blight that same season. However, planting fusariuminfected seed will decrease tillering

Seed treatments won’t help a seed lot that has a high level of dead, damaged or infected seed. head blight, fusarium graminearum causes the greatest yield loss in cereal crops. When you’re assessing your potential for problems with fusarium head blight, fusarium graminearum requires special attention.

with more than five per cent fusarium graminearum or 10 per cent other fusarium species, don’t use it as seed. 3. If your seed has less than five per cent fusarium graminearum or 10 per cent other fusarium species,

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it’s still ok to plant. However, you should make sure it has a high level of germination, since emergence may be reduced with high fusarium levels. 4. If you’re planting infected seed, guidelines suggest using a seed treatment if your seed is greater than two to three per cent infected with fusarium graminearum, or greater than five per cent infected with other fusarium species. Research is still on-going as to the effectiveness of seed treatments in the fight agatins fusarium head blight. Studies in Saskatchewan and Manitoba reached different conclusions. Treatment effectiveness will depend on weather, seed variety and seeding conditions. Researchers recommend using a seed treatment as a form of insurance against seedling diseases, however, keep in mind that this won’t keep you from getting

» CONTINUED ON PAGE 4

Wheat & Chaff ..................

2

Features ............................

5

Crop Advisor’s Casebook

6

Columns ........................... 36 Machinery & Shop ............ 44 Cattleman’s Corner .......... 48

Getting started with drainage BRUNEL SABOURIN

PAGE 14

National Farm Machinery Show

SCOTT GARVEY PAGE 44

FarmLife ............................ 53


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