Location: Nematology Laboratory
Title: Pathogenicity and control of Heterodera schachtii and Meloidogyne spp. on some cruciferous plant cultivars Authors
Submitted to: International Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 8, 2013
Publication Date: June 1, 2013
Citation: Ibrahim, I.K., El-Saedy, M.A., Basyony, A.B., Handoo, Z.A., Chitwood, D.J. 2013. Pathogenicity and control of Heterodera schachtii and Meloidogyne spp. on some cruciferous plant cultivars. International Journal of Nematology. 23(1):73-81. 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, including Egypt. One approach to solving the problem of developing a safe method of controlling these pests is through the use of various soil amendments that may reduce nematode reproduction. In the present study, ARS and Alexandria University (Egypt) scientists examined several soil amendments in the greenhouse for their effect on the reproduction of cyst and root-knot nematodes on cabbage. Soil treatments with dried plant materials prepared from marine algae, castorbean, goosefoot, or lantana greatly reduced the numbers of cyst and root-knot nematodes on cabbage plants, with the marine algae being most effective. The results are significant because they provide the first evidence that these specific soil amendments may have potential as management agents for cyst and root-knot nematodes. This research will be of use to scientists involved in developing methods for reducing the crop losses caused by cyst and root-knot nematodes on cabbage.
Technical Abstract: The pathogenicity of the sugar beet cyst nematode Heterodera schachtii and the root-knot nematodes Meloidogyne arenaria, M. incognita and M. javanica on cabbage cvs. Balady, Brunswick and Ganzouri, cauliflower cv. Balady, turnip cv. Balady, and radish cv. Balady was determined in several greenhouse tests. The results showed that the tested cruciferous plant cultivars were either susceptible or highly susceptible to the tested nematodes except radish cv. Balady, which was moderately resistant to H. schachtii and moderately susceptible to the tested root- knot nematode species. Control of H. schachtii and M. incognita on cabbage cv. Balady was studied in the greenhouse. Soil treatments with dried plant material of marine algae (Botryocladia leptopoda, Ulva fasciata), castorbean, goosefoot and lantana greatly reduced the numbers of cysts of H. schachtii, as well as root galls and egg masses of M. incognita on infected cabbage plants. Treatments with the tested marine algae were more effective in suppressing nematode infection and reproduction on cabbage plants than the other treatments. Also, soil treatments with Vertimec (abamectin) and crude culture suspension and cell-free supernatant of Bacillus thuringiensis suppressed the numbers of H. schachtii cysts and root galls and egg masses of M. incognita developing on cabbage plants.