Abstract
The potential use of two predacious mites, Parasitus fimetorum (Berlese 1904) and Macrocheles muscaedomesticae (Scopoli 1972), for controlling the root knot nematode, Meloidogyne javanica Treub 1885 was evaluated under laboratory and semi-field conditions. Obtained results revealed that the 2 predators significantly reduced the root knot nematode numbers. In addition, the highest reduction percentage (57.24%) in nematode juveniles was recorded at the treatment of (1000 nematode + 10 mites). For M. muscaedomesticae, the highest mortality percentage (50.83%) in nematode juveniles was recorded at the treatment of (1000 nematode + 50 mites), followed by (1000 nematodes + 20 mites) 48.88%, while the treatment of (1000 nematode + 10 mites) gave (47.13%). The combination of the 2 mite species (1000 nematodes + 50 mites/species) caused the highest mortality percentages in nematode juveniles (69.29%), followed by (1000 nematodes + 20 mite/species) 50.51% and the treatment of (1000 nematode + 10 mite/species) (37.66%). At the pot experiments, the highest overall mortality percentage in M. javanica juveniles was recorded at the treatment of P. fimetorum + M. muscaedomesticae giving (57.07%), followed by the treatment of P. fimetorum (39.17%), and then, by M. muscaedomesticae alone that recorded only (17.47%). In conclusion, predacious mites can be partially considered a control tool of the parasitic nematodes.
Highlights
The root knot nematode, Meloidogyne javanica (Treub 1885), is one of the most serious pests, attacking large numbers of field, vegetable, and fruit plants in Egypt
Macrocheles muscaedomesticae culture Predatory mite specimens of M. muscaedomesticae were extracted, using Tullgren funnels from a house fly culture reared on artificial diet of 9 g powder milk and 5 g yeast dissolved in 100 ml water, added to 100 g fine bran (Wilkins and Khalequzzaman 1993)
Numbers of P. fimetorum were relatively low after 30 days at the treatment of (1000 nematodes + 10 mites), while it increased at other treatments
Summary
The root knot nematode, Meloidogyne javanica (Treub 1885), is one of the most serious pests, attacking large numbers of field, vegetable, and fruit plants in Egypt. It can be found in all types of soils and cultivated regions of Egypt. In Egypt, Taha et al (1988) studied the effect of feeding Neocunaxoides andrei (Baker and Hoffmann) on the Heikal Egyptian Journal of Biological Pest Control (2020) 30:33 nematode, Panagrolimaus rigidus (Schneider 1866) Thorne 1937, on its developmental time and fecundity under laboratory conditions of 30 °C and 70% RH, and found that cunaxids are generalist predators because they feed on diverse prey, such as plant mites and other small arthropods and nematodes. Maareg et al (2005) evaluated the potentiality of 7 predacious mite species in feeding on the juveniles of Meloidogyne incognita and found that all the tested mites fed successfully on nematode stages except Cunaxa sp
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