Pacific Pests, Pathogens & Weeds - Mini Fact Sheet Edition

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Celery root knot nematode (254)

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Photo 1. Gall on the roots of Phaseolus bean, caused by Meloidogyne species.

Photo 2. Severe infestation of root knot nematode, Meloidogyne species, on tomato.

Photo 3. Yellowing and browning at margins of celery leaves, caused by root-knot nematode, Meloidogyne species.

Photo 4. Yellowing of celery leaves caused by root-knot nematode, Meloidogyne species.

Photo 5. Plant in Photo 2 showing below ground symptoms: swollen roots and galls caused by root-knot nematode, Meloidogyne species.

Summary

• Worldwide distribution. In tropics and sub-tropics. Apart from celery, common vegetable hosts are beans, capsicum, carrot, cucumber, eggplant, ginger, lettuce, potato, tomato, and yam; common fruit crop hosts are melon, papaya, and pineapple, and many ornamentals. An important nematode disease.
• Above ground, leaves yellow with brown margins, wilt and die early; below ground, galls on roots.
• Eggs in soil hatch, young larvae enter root behind the tip, and cause cells to swell and galls to form.
• Cultural control: important - pasteurise nursery soil or use soil-less mixes; add organic matter; solarise soil for 4-6 weeks under black plastic; keep soil well watered and use mulch; collect and burn trash after harvest; fallow land for 4-6 months; rotate with e.g., more tolerant maize, peanuts, onions, brassicas, chilli, sweetpotato, or sorghum x Sudan grass hybrids, green panic grass, or grow marigold cover crops.
• Chemical control: none recommended.

Common Name

Root knot nematode. General account of root knot nematodes (see Fact Sheet no. 127).

Scientific Name

Meloidogyne species. Meloidogyne hapla, Meloidogyne incognita, and Meloidogyne javanica all attack celery.

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