Den Hartigh sells a wide range of potato varieties. Through years of knowledge of and experience in various markets, we know the most important properties. In addition to yield, resistances to diseases and pests are also an important starting point. In our breeding program, crossing such resistances into new seedlings is one of the objectives.
Resistances and diseases: spraing
Resistances by market
For the organic market, Den Hartigh has developed potato varieties with resistance to Phytophthora, for the export market strongly common scab resistant varieties with a high yield and for the French fries market varieties that have good resistances against potato cyst nematodes, wart and tobacco rattle virus. The newly developed varieties are strong against virus Y, which is appreciated by our seed producers.
Spraing is caused by tobacco rattle virus (TRV) and occurs mainly on sandy and peaty soils. Transmission of this virus is mostly supported by nematodes, such as Trichodorus and Paratrichodorus. I can happen that entire potato fields are infected. The damage to the producer is large because the yield is no longer suitable for potato production. Internal damage and small tubers are symptoms of spraing (TRV). An affected tuber has small necrotic spots or fibers in the flesh or clearly visible necrotic circles in the flesh. It also happens that necrotic circles are visible on the skin of the tuber. These run deep into the tuber. Susceptibility for spraing can differ between varieties. Within Den Hartigh, Connect (8.1), Endeavour (8.7), King Russet (7.2), Labella (8.0), Laperla (7.0), Taisiya (7.2), Edison (7.3) and Ludmilla (9.0) are varieties that rarely show symptoms of spraing.