Suppression of Heterodera schachtii Populations by Dactylella oviparasitica in Four Soils.
نویسندگان
چکیده
The effects of Dactylella oviparasitica strain 50 applications on sugarbeet cyst nematode (Heterodera schachtii) population densities and plant weights were assessed in four agricultural soils. The fungus was added to methyl iodide-fumigated and nonfumigated portions of each soil. The soils were seeded with Swiss chard. Four weeks later, soils were infested with H. schachtii second-stage juveniles (J2). Approximately 1,487 degree-days after infestation, H. schachtii cyst, egg and J2 numbers and plant weights were assessed. In all four fumigated soils, D. oviparasitica reduced all H. schachtii population densities and increased most of the plant weights compared to the nonamended control soils. In two of the nonfumigated soils (10 and SC), D. oviparasitica reduced H. schachtii population densities and increased most plant weight values compared to the nonamended control soils. For the other two nonfumigated soils (44 and 48), which exhibited pre-existing levels of H. schachtii suppressiveness, fungal applications had relatively little impact on H. schachtii population densities and plant weights. The results from this study combined with those from previous investigations suggest that D. oviparasitica strain 50 could be an effective biological control agent.
منابع مشابه
Mode of Parasitism of Meloidogyne and Other Nemaiode Eggs by Dactylella oviparasitica.
Hyphae of Dactylella oviparasitica proliferated rapidly through MeIoidogyne egg masses, and appressoria formed when they contacted eggs. The fungus probably penetrated egg shells mechanically, although chitinase production detected in culture suggested that enzymatic penetration was also possible. In soil, D. oviparasitica invaded egg masses soon after they were deposited on the root surface an...
متن کاملJournal of Nematology
A series of experiments were performed to examine the population dynamics of the sugarbeet cyst nematode, Heterodera schachtii, and the nematophagus fungus Dactylella oviparasitica. After two nematode generations, the population densities of H. schachtii were measured in relation to various initial infestation densities of both D. oviparasitica and H. schachtii. In general, higher initial popul...
متن کاملکنترل بیولوژیکی نماتود سیستی چغندر قند Heterodera schachtii به وسیله قارچ تریکودرما در آزمایشگاه و گلخانه
Sugar beet cyst forming nematode (Heterodera schachtii) is one of the most important pathogens of the sugar beet in Iran. For biological control of Heterodera schachtii, 10 isolates of Trichoderma related to two species T. harzianum and T. virens were examined in laboratory and green house on eggs and cysts for two years. Results obtained from the laboratory assay showed that isolates of Tricho...
متن کاملParasitism of Beta vulgaris by Meloidogyne hapla and Heterodera schachtii alone and in combination.
Interrelationships of Meloidogyne hapla and Heterodera schachtii in combinations of several population levels and different inoculation periods were studied. Results indicated suppression of gall development of M. hapla in any treatment in which inoculations of H. schachtii preceded those of M. hapla by 10 days. This interrelationship was characterized by amensalism with M. hapla serving as an ...
متن کاملکنترل بیولوژیکی نماتود سیستی چغندر قند Heterodera schachtii به وسیله قارچ تریکودرما در آزمایشگاه و گلخانه
Sugar beet cyst forming nematode (Heterodera schachtii) is one of the most important pathogens of the sugar beet in Iran. For biological control of Heterodera schachtii, 10 isolates of Trichoderma related to two species T. harzianum and T. virens were examined in laboratory and green house on eggs and cysts for two years. Results obtained from the laboratory assay showed that isolates of Tricho...
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ورودعنوان ژورنال:
- Journal of nematology
دوره 38 3 شماره
صفحات -
تاریخ انتشار 2006