Aphelenchoides besseyi

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Aphelenchoides besseyi symptoms on rice leaves (click on image to enlarge it)
Author(s): Donald Groth, Louisiana State University AgCenter
Source: IPM Images
Aphelenchoides besseyi symptoms on rice leaves (click on image to enlarge it)
Author(s): Donald Groth, Louisiana State University AgCenter
Source: IPM Images

Aphelenchoides besseyi Christie, 1942 - (white tip nematode)

This nematode causes the white tip disease of rice. It is found in various tropical and subtropical countries, but is an important quarantine organism in other countries. Apart from rice, several additional crops like strawberry are also infested. It is seed-borne and feeds as ectoparasite on the above-ground parts of the host plant. The leaf tips of infected rice plants (the top 3-5 cm) show a strong chlorosis and later dry up. Plants are stunted and yield losses may reach 50%. The nematode survives on the dried seeds for up to 3 years.

When infested rice seeds are planted and germinate, the nematodes feed at the growing point on the developing rice leaves. Later they move to the developing seeds and enter a dehydrated resting stage. The life cycle is less than 2 weeks under favorable conditions (30°C). It can also feed on fungi in order to survive in the soil in the absence of a host plant. Management involves the use of uninfested seeds or treating infested seeds, e.g. with hot water. Mature females are 0.5-0.9 mm long with a large median bulb and a terminal spike on the tail.

Vernacular names
• Deutsch: Reisblattälchen
• English: white tip nematode
white tip disease of rice
• Español: nematodo de las puntas blancas
• Français: nématode du bout blanc du riz
nématode foliaire du riz