Golden Nematode


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Golden Nematode

 

(Heterodera rostochiensis), a roundworm of the family Heteroderidae. Body length, about 1 mm.

The golden nematode is a parasite of the roots (less often, of the tubers) of potatoes, tomatoes, and, occasionally, deadly nightshade. It is found in Europe, Asia, North and South America, Africa, and Australia. It is also found in several republics of the USSR. Development from the larval stage to maturity takes place in the tissues of the roots or tuber of the host plant. The transparent wormlike male crawls out of the root into the soil; the anterior end of the female remains attached to the root or tuber, its swollen body covered by a thick cuticle, protruding outside the plant. The male dies after fertilization. The female forms more than 1,000 eggs; these remain inside her body, which turns into a cyst after her death. In the spring the larvae emerge from the cyst and embed themselves in the plant roots.

The golden nematode retards the development of the host plant, significantly reducing yield; when infestation is extreme the potato plants form either no tubers at all or from one to three tiny tubers. A kilogram of soil in heavily infested fields may contain as many as 2, 500 cysts of golden nematode. Counter-measures include quarantine, planting resistant varieties of potatoes, crop rotation and removal of the infested roots and tubers from the fields, and disinfection of the soil with chloropi-crin, Carbathion, or Nemagon.

REFERENCE

Kir’yanova, E. S., and E. L. KralP. Paraziticheskie nematody rastenii i mery bor’by s nimi, vols. 1–. Leningrad, 1969–71.
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If you only have one cyst, you can still use our method to confirm whether you have golden nematode or pale cyst nematode, and our method is relatively easy to perform," Wang says.
The system is one of several new technologies developed to distinguish the golden nematode from the pale cyst nematode.
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So we had begun developing different germplasm here and sending it to Peru for testing, since they have other races of the golden nematode there," Brodie explains.
We had some germplasm that was really good at resisting several races of the golden nematode, and we thought we'd simply make it available to other countries that already had those races," says Brodie.
as well as ARS potato breeding programs at Beltsville, Maryland, and Aberdeen, Idaho - in search of fresh weapons against the golden nematode.
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