Types of nematodes
Those nematodes which are parasites are actively present in almost any soils cultivated by man.
The word nematode comes from the Greek words Nema, which means thread and the word Toid which means form. Nematodes are microscopic worms 0,1 mm in length and they vary in population density depending on the soil type and plants being grown. There are many types of nematodes, some induce the host plant to produce nutrients which the nematodes can survive on, some enlarge the plant root structures which they then live in or some do both.
Root Knot nematodes
They produce galls especially on root crops and can severely damage plant health. Crops at risk include peas, onion, carrot parsnip and spring wheat. Please note that the knot nematode Meloidogyne chitwoodi and Meloidogyne fallax have quarantine status.
Beard like objects which grow and live on root surfaces. Wide spread in Europe and many other parts of the world. Crops at risk include potato, sugar beet, rape and beetroot.
These nematodes produce necrotic lesions throughout the cortex of infected roots. Crops at risk included carrot and parsnip, maize and some legumes.
Stubby Root nematodes
A large family of nematodes that make plant roots have a stunted or stubby appearance. The infected roots are less capable of supplying nutrients and water to the plant. Crops at risk are potato, sugar beet, onion, carrot and parsnip.
They can cause distortion in the stems of winter beans and necrotic areas on plant leaves. Crops at risk are potato, onion, flower bulbs and winter beans.