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Title: Interactions of Heterodera daverti, H. goldeni and H. zeae with Meloidogyne incognita on rice

Author
item IBRAHIM, IBRAHIM KHAYRY - Alexandria University Of Egypt
item EL-SAEDY, MOHAMED ANWAR - Alexandria University Of Egypt
item AWD-ALLAH, SHERIN FADL ALI - Alexandria University Of Egypt
item Handoo, Zafar

Submitted to: Pakistan Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/4/2016
Publication Date: 6/1/2016
Publication URL: http://handle.nal.usda.gov/10113/63156
Citation: Ibrahim, I., El-Saedy, M., Awd-Allah, S., Handoo, Z.A. 2016. Interactions of Heterodera daverti, H. goldeni and H. zeae with Meloidogyne incognita on rice. Pakistan Journal of Nematology. 34(2):187-192.

Interpretive Summary: Plant-parasitic nematodes are microscopic worms that feed on plants and cause an estimated ten billion dollars of crop losses each year in the United States and 100 billion dollars globally. Cyst and root-knot nematodes are the most economically important groups of plant-parasitic nematodes worldwide. One problem facing growers occurs is that the potential for increased damage when both kinds of nematodes occur in the same field is not known in many crops. In the present study, ARS and Alexandria University scientists examined the interactions of three species of cyst nematodes with a root-knot nematode on rice. The results showed that each cyst nematode species tended to reproduce more in experiments where they were inoculated a week before the root-knot nematode, in comparison to experiments with prior or simultaneous inoculation with the root-knot nematode. The results are significant because they provide the first demonstration of cyst and root-knot nematode interactions on rice. This research will be of use to scientists, growers and extension agencies involved in cyst and root-knot nematode research and control.

Technical Abstract: The interactions of the cyst nematodes Heterodera daverti, H. goldeni and H. zeae with the root-knot nematode Meloidogyne incognita on rice (Oryza sativa) cultivars Giza 178 and Sakha 101 were studied in the greenhouse. Inoculation with H. goldeni alone or one week before inoculation with M. incognita on rice cv. Sakha 101 resulted in a significant increase in the number of cysts of H. goldeni as compared to plants inoculated with M. incognita concurrently or a week beforehand. When H. daverti or H. zeae were inoculated one week after inoculation with M. incognita on rice cultivars Giza 178 or Sakha 101, respectively, the final population of these cyst nematodes increased. Treatments with M. incognita alone or one week before inoculations with the tested cyst nematodes induced a significant increase in the numbers of M. incognita root galls and egg masses as compared with other treatments.