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The Relationships Between Plant Parasitic Nematodes of Sugarbeet And Other Soil Fauna

The soil arthropod and nematode fauna and microorganisms groups associated with sugarbeet fields were identified and surveyed. Also, the relationship among plant parasitic nematode, soil microorganisms and soil animals were studied. Seven species of predacious soil mites were evaluated for their predacious activity against of both juvenile and egg-masses of M.incognita nematode. Ten soil nematode-antagonistic fungi and seven species of soil bacteria were Isolated, and tested against M. incognita. Also, results showed that broiler chicken and layer chicken are the best substrates for rearing and carrying six of nematode- parasitic fungi.There is a negative correlation between soil contamination extent by M. incognita and yield of sugarbeet. Also, tolerance limit for Chems variety (Polygerm) was determined.

Mostra/Nascondi contenuto.
INTRODUCTION ------------------------------------------------------------- -1- INTRODUCTION sugarbeet, beta vulgaris saccarifera L. is considered one of the most important crops that rank next to sugarcane in importance as sugar crop in Egypt and attribute 28 % of sucrose production. In Egypt, sugarbeet is cultivated in 153.8 thousand faddans with an average production of 20.6 tons per faddan (2001/2002). In the recently, reclaimed desert irrigated lands at West Nubaryia and El-Bostan regions has shown that sugarbeet can be successfully grown under sandy soil area condition. Plant parasitic nematodes, especially root-knot nematodes are known among the most serious pests of sugarbeet in many countries. Of some 50 described species of Meloidogyne, only few parasitized sugarbeet, viz, M. arenaria, M. incognita, M. javanica, M. hapla and M. naasi are economically important to sugarbeet production (Arnold, 1984 ). M. arenaria, M. incognita and M. javanica essentially are hot –weather organisms and most important where beets are grown in regions with long, hot summers and short, mild winter. In Egypt, M. incognita and M. javanica were reported as major nematode pests of sugarbeet (Oteifa and El-Gindi, 1982; Abd El-Massih, 1985; Maareg et al., 1988 a&b and 1998 and Ismail et al. 1996). The average annual loss in yield of sugarbeet due to M. incognita in different states in the U. S. A. was estimated to be as high as 10-50 % and in Italy as 5-15 % (Altman and Thomson, 1971). No estimation for loss in sugar content due to M. incognita was reported. Yield loss estimates were based on nematode population, on curves derived earlier relating nematode

International thesis/dissertation

Autore: Ibrahim Mohamed Abdou Gohar Gohar Contatta »

Composta da 263 pagine.


Questa tesi ha raggiunto 226 click dal 01/06/2006.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.