An experiment was conducted to search the efficacy of radish (Raphanus sativus) and arugula (Eruca sativa) for the control of Meloidogyne arenaria in the commercial tomato growing greenhouse. R. sativus and E. sativa were used as winter cycle crops and lettuce as a susceptible crop and 4 months after sowing, host level of the treatment plants was evaluated. All parts of R. sativus and E. sativa were incorporated except lettuce was covered with transparent polyethylene film for 4 weeks. R. sativus and E. sativa had not any root galls, and these plants caused reducing number of juveniles in the soil, in contrast to control and lettuce plots before growing tomato. Gall index and egg masses were significantly decreased on tomatoes in plots of applied biofumigation with E. sativa and R. sativus. It was concluded that growing R. sativus and E. sativa as a winter cycle plants before susceptible plants would be helpful to reduce the damage of root-knot nematode M. arenaria and increased crop yields.

Root-knot nematode, Meloidogyne incognita (Kofoid and White) is one of most damaging pathogen of vegetables, including carrot (Daucus carota L.). We evaluated nematicidal potential of chitosan in combination with chopped leaves of Argemone mexicana L., Achyranthes aspera L., and Ricinus communis L. against infestation caused by M. incognita on carrot under both in vitro and in vivo. Infectious stage (J2s) and egg masses of M. incognita were exposed to different concentrations (2500, 2000, 1500, 1000, and 500 ppm) of chitosan and botanical extracts separately. Maximum mortality of J2s and the highest inhibition in egg hatching was observed at 2500 ppm of chitosan after 36 h and days incubation period, respectively and minimum found in 500 ppm of A. aspera after 12 h of incubation period. Furthermore, pots treated with 1 g chitosan and 30 g of freshly chopped leaves of all three tested botanicals significantly reduced pathological parameters and improved growth and photosynthetic attributes of carrot. In combination with botanicals, chitosan showed a synergistic effect against M. incognita on carrot as compared to chitosan alone. This study proves that chitosan's bio-efficacy, combined with selected three botanicals, could be utilised to manage M. incognita on the carrot as a potential sustainable treatment.

Research was conducted to evaluate the reproduction of 90 Meloidogyne isolates including Meloidogyne arenaria (Neal, 1889) Chitwood, 1949 (38 isolates), Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 (4 isolates), Meloidogyne javanica (Treub, 1885) Chitwood, 1949 (11 isolates) and Meloidogyne luci Carneiro et al., 2014 (37 isolates) (Tylenchida: Meloidogynidae) from the middle Black Sea Region of Turkey on susceptible and resistant tomato cultivars in a greenhouse with temperature controlled between 2013 and 2014. Galling index and reproduction factor of nematode isolates were assessed in a pot assay and resistance-breaking isolates were determined according to their reproduction index. Among the isolates, only two isolates of M. luci (Or-2 and Pr-1) had a similar galling index on susceptible and resistant tomato (P ≤ 0.05). Four isolates of M. luci (Çr-19, Or-2, Pr-1 and Pr-2), two isolates of M. arenaria (A-7 and Sn-11) and an isolate of M. incognita (A-11) produced more eggs than the initial inoculum on resistant tomato. These root-knot nematode isolates, except two isolates of M. arenaria , were classified as resistance-breaking isolates having a reproduction index higher than 10%. These findings showed that the Mi-1.2 gene confers resistance to M. luci but four isolates of M. luci could overcome this resistance. This is the first report for resistance-breaking isolates of M. luci in tomato .

The host response of fifteen winter squash (Cucurbita maxima) and five pumpkin (Cucurbita moschata) dihaploid genotypes to Meloidogyne arenaria, M. incognita, M. javanica, and M. luci was screened in pot experiments. Root galling and nematode reproduction were detected in all combinations of plant genotype and nematode species. Ten genotypes of C. maxima and three genotypes of C. moschata were considered highly resistant (<10% of the susceptible genotype) or moderately resistant (<50% of the susceptible genotype) to one or more Meloidogyne species based on nematode reproduction as a percentage of the most susceptible genotype. Genotypes 55CA15-A3 and G14-IP1 of C. maxima were highly resistant to M. luci and M. arenaria, respectively. Both 14BO01-O2 and G9-A4 genotypes of C. moschata were considered highly resistant to M. arenaria. However, these genotypes still allowed significant nematode reproduction because egg number per plant was higher than initial number of eggs used as inoculum, indicating that all genotypes were hosts.

Oilseed radish (OSR; Raphanus sativus), which can be used as a trap, cover or biofumigant when incorporated as a green manure crop, has potential for managing soil-borne biotic factors such as Meloidogyne hapla. However, exploiting the multi-purpose traits of OSR requires careful understanding of the biology of M. hapla and the prevailing soil conditions. When an OSR Line 'RO4S-PSOSR', and cv. Diakon grown in 300 cm3 of sandy, loamy sand or muck soils were inoculated with 3000 eggs of M. hapla populations (collected from the three soil types) and maintained for approximately 500 degree days (DD, base 10°C), all nematodes completed their life cycle in both hosts, with significantly more nematodes infecting OSR plants in the sandy soil. When cvs Diakon and Rutgers tomato (standard susceptible species) were grown under the same conditions with an inoculum of 2000 eggs per pot, infection was greatest in the sandy soils. Oilseed radish shoot growth was significantly lower in the sandy soil compared with muck or loamy sand soils. While the effect of soil type on OSR growth and M. hapla population densities is to be expected, the nematodes' completion of a life cycle at about 450-500 DD suggests that OSR hosts like cv. Diakon may be best used as a trap crop and plants should be terminated before the nematode completes a life cycle.