There are three species of nematodes: root, stem and leaf.
Globular growths or swellings on the roots of the plant root certificate lesion nematode. Root nematode serious pest of many houseplants, fortunately it did not occur often. Nematode causes the roots of education or swelling - the Gauls. Size, they can be both with a grain of wheat, as well as a walnut. Nematode worms are small, colorless with filiform body length of up to 1,5 mm. Larvae of the female lays in Gaul, then they spread rapidly in the soil. Damaged plants are suspended in the nematode growth, yellow, and often die. The Gauls are composed of loose tissue, which is easily broken, and entails the decay of all roots. Caused by nematode damage to roots contribute to root penetration of pathogenic bacteria and fungi. Control measures. To deal with already infected plants are usually already possible to destroy it along with the pot.
You can try to use the drug "Narcissus." But to prevent infection of nematodes can be sterilized soil before planting. Leaf nematodes under a microscope in the transmission sheet. Leaf nematodes - microscopic worms, colorless up to 1 mm, and move rapidly. In the field of tissue damage leaf discoloration and formed a yellowish translucent to the light spots. Over time, sick leaves turn brown, wither or rot. Plant dies. Infection occurs from one plant to another. Resettlement nematodes contributes water, soil, transmitted from infected areas in which the larvae may be many months. Control measures. Destroy the plant, shelves, window sills, glass and equipment disinfected with hot water.
Stem nematode - a small threadlike worms, up to 1,7 mm - a serious pest of flower crops. Nematode parasite adapt to certain types of plants and do not move to the representatives of another species. Damaged plants have an ugly development stems leaves and flowers. The shoots are shortened and sometimes have swellings. Affected parts are unnaturally pale color, and eventually turn brown and die. Control measures. Destroy the plant, it is best to burn.