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Predatory Behavior of Some Soil Mites towards Root-Knot Nematode
Meloidogyne Incognita Infecting Sugarbeet Crop
- Maareg1, M.F. I.M.A. Gohar 1; And G.H. Rady2
- (1)Sugar Crops Research Institute, ARC, Egypt.
- (2)Plant protection department, Faculty of Agriculture, Moshtohor, Zagazig University
- The Third International Conference onIPM Role in Integrated Crop management and Impacts on Environment and Agricultural Products. 26-29 November 2005, Giza, Egypt.
Abstract
Seven predacious soil mites were extracted from sugarbeet fields namely, Proprioseiopsis messor (Wainstein), Cheyletus malaccensis (Oudemans), Cunaxa sp., Glycyphagus domesticus (De Geer),Macrocheles monchaolska (B & K), Platyseius major (Halbert) and Uropoda misella (Berlese). They were evaluated for their predacious activity on immature stages of root-knot nematode, Meloidogyne incognita (Kofoid & White) under laboratory and greenhouse conditions. In laboratory test, the data revealed that all tested soil mites (except Cunaxa sp.) fed on immature stages of M. incognita. These mites could be classified into three groups according the prey type, P. messor; C. malaccensis and P. major were found to be predators on juvenile larvae stage. One mite was a predator on egg-masses stage and two mites were predators on both juvenile larvae and egg-masses stages.The highest perdition rate on juvenile larvae was achieved by C. malaccensis followed by P. major, then by P. messor. However, the mite, M. monchaolska was ranked the first in predation of both juvenile larvae and egg-masses followed by U. misella. In greenhouse test, the results indicated that addition a mixture of two mites, C. malaccensis and M. monchaolska to soil of sugarbeet infected with M. incognita resulted in a significant reduction in all damage parameters of galls, larvae, females and egg-masses numbers/root and juvenile larvae in soil. The highest increase in root weight (75.0%) was obtained in presence of the two mites followed by M. monchaolska alone (71.8 %), then C. malaccensis (40.0%).
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