Use Teagasc’s potato variety page and ask for current variety and seed-lot information. Maincrop options include Sarpo Mira, Sarpo Axona, Carolus and Setanta. Check local seed availability separately.
Read foliage and tuber resistance separately
Compare foliage and tuber blight ratings separately. Those columns describe different parts of the crop. Do not collapse them into a single unexplained “resistance score”.
Check which trial edition and rating scale a table comes from, and note the publication date of any older guide you use. For a storage crop, ask about tuber resistance and storage conditions. For an early market, give the adviser your harvest target and the buyer’s specification.
Build a variety comparison you can revisit
Write the shortlisted names down the side of a sheet and ask every supplier the same questions: foliage resistance, tuber resistance, maturity, intended cooking or processing use, storage characteristics and seed availability. Note the date of the evidence and keep the supplier’s own wording instead of inventing a numerical score.
Ask how each observation was obtained: published trial, the breeder’s description or experience on a particular holding, and write these down separately. A good crop on a neighbour’s ground is useful experience, but it is not a comparative trial.
Add the commercial questions that can change the order: delivery timing, pack presentation, substitution policy and how to report a quality concern. Seed that cannot be delivered in time is not an option.
Match Sarpo names to the seed offered
Sarpo Mira and Sarpo Axona are distinct varieties. Give the merchant the full variety name when you order, and ask for the consignment identity and quality information before you confirm.
When the bags arrive, check the label against your order while the paperwork is still with them, and write the variety and lot reference into the planting plan. If the merchant proposes a substitute, talk it through with your adviser and buyer first. With several varieties on one holding, mark which field or bed each one is for and keep unplanted bags identified.
Include market suitability in the comparison
Tell the adviser whether the crop is for direct retail, a wholesale customer or processing, and get that buyer’s own requirements for size, appearance, cooking or processing quality and delivery timing. Ask the merchant for the variety description and any evidence that fits that outlet. Keep your own tasting notes apart from the buyer’s acceptance specification: a variety that suits one customer may need a separate conversation with another.
Compare the harvest and storage workload as well as the disease trait, and give the adviser your planting window, soil, irrigation and harvest capacity. One resistance claim does not make a crop plan.
Keep seed health and resistance distinct
Blighted tubers, volunteers and discarded potatoes can supply infection. A resistance characteristic does not describe the condition of the particular seed lot delivered. Keep the supplier and consignment documents, and ask how a suspected quality problem should be reported. If you find damaged or suspect tubers, photograph them next to the bag or batch reference and contact the supplier before mixing lots.
Collect remaining tubers at harvest and prevent volunteer potatoes from growing in the following crop. Inspect grading-waste sites as well as the planted field. Blighted tubers can survive winter in the soil or discarded heaps and supply infection to nearby potatoes. Sow healthy planting material and agree how affected waste will be removed within the organic system.
Keep your spray records in one place. Free to start.
Plan monitoring before planting
Decide who will inspect the crop and how suspect symptoms get reported. Use the potato diagnosis guide to see which photographs and details to prepare, and use the separate foliage and tuber ratings to decide what to watch for. Keep any pesticide question for the separate blight treatment plan, where you record the exact product and conditions.
At harvest, keep variety and field identity attached to each lot. Review foliage, tuber condition and buyer acceptance separately; that gives next year’s seed order evidence from your own crop.
Prevent potato blight: variety choice and organic crop planning
Use crop rotation, healthy well-nourished soil and appropriate resistant varieties in organic prevention. Physical barriers and natural predators address other crop pests.
Begin organic treatment for potato blight with prevention. An established outbreak cannot be eradicated from the crop. Separate protection of healthy plants from management of affected material.
Identify the crop and certification situation
Check the permitted-input legislation supplementing the organic standards; those lists change. A product list remembered from a previous season does not settle a new proposal. Keep your certification body’s current requirements with the crop file. When you contact the adviser, give the field, variety, planting-material reference, intended market and crop stage, and say whether you are planning prevention or already seeing symptoms. For suspect symptoms, photograph the leaves, stems and the whole-plant pattern.
Connect weather information with field observations
Agree with the adviser which forecast or warning service to use, and save its issue date and area next to your symptom notes. Mark observation spots so a relief scout can return to the same plants, and tell the scout what to report: which part was inspected and what was seen is more useful than “checked”. If conditions or symptoms change, send an updated enquiry with the earlier history.
Potato blight cause: separate the pathogen, infection sources and spread
Trace infection sources separately from the weather conditions favouring spread. The pathogen is an oomycete. Infected tubers left after harvest, discarded potatoes and affected planting material can supply infection. Mild, damp weather favours spread. Inspect both the crop and nearby potato material. Inspect suspected sources before attributing an outbreak to a particular waste heap.
Sketch the planted field, neighbouring potato crops, former potato ground and any place where grading waste has been tipped. Mark what you actually inspected and what someone else reported. Mark infected potato material for removal, and choose volunteer-control methods that are allowed in your organic system. Note whether volunteers appear in the following crop, along a margin or among discarded tubers, and who will do the clearing and how you will check it was done.
Assess a new variety before expanding its area
Trial a new variety on a representative patch first. Record seed lot, planting date, field position and harvest date, and compare disease observations with marketable yield and quality. One good row does not prove performance on every soil and season.
Harvest timing and an infected canopy
Early and second-early crops may be lifted before blight pressure peaks. For an infected crop with sufficiently developed tubers, cutting and removing haulm reduces spore wash-down. Leave at least two weeks before lifting so spores on the soil surface can die. Agree the harvest date for your actual crop with the agronomist.
Next step
Compare foliage and tuber resistance with seed availability, then plan monitoring through the potato blight guide.