Components of soil suppressiveness against Heterodera schachtii

Westphal, Andreas; Becker, J. Ole

doi:10.1016/s0038-0717(00)00108-5

Cited by 79 publications

(50 citation statements)

References 17 publications

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“…In studies with Meloidogyne spp., D. oviparasitica parasitized living and dead eggs (15,17,18) as well as females (18). In studies from our labs, both culture and culture-independent analyses have suggested that D. oviparasitica is one of the most abundant fungi in H. schachtii cysts from the suppressive 9E soil (22,25). Application of D. oviparasitica strain 50 to nonsuppressive soil produced a high level of egg parasitism similar to the naturally suppressive 9E soil (13).…”

Section: Discussionmentioning

confidence: 80%

“…Prior culture-based experimentation suggested that D. oviparasitica and F. oxysporum were common fungal inhabitants of H. schachtii cysts obtained from this soil (22). Molecular population studies showed that D. oviparasitica and F. oxysporum rRNA gene levels positively correlated with high and minimal to moderate levels of suppressiveness, respectively (25).…”

Section: Discussionmentioning

confidence: 85%

“…In prior studies, differences in plant weights among soils with various levels of suppressiveness were frequently not detected (8,(20)(21)(22). In fact, if differences did exist, they were typically the opposite of what might be expected.…”

Section: Discussionmentioning

confidence: 94%

“…Amendment of 1% of the 9E soil into a fumigated nonsuppressive 9E field site effectively transferred the suppressiveness (21), while exposure to 55°C for 30 min eliminated it (22). In addition, H. schachtii cysts that developed in the suppressive soil transferred the suppressiveness to fumigated nonsuppressive 9E soil (22).…”

mentioning

confidence: 97%

“…For a number of years, we have investigated a nematode-suppressive soil at field 9E, an approximately 2-ha site at the University of California-Riverside Agricultural Field Station (8,(20)(21)(22)(23)(24). In 1975, field 9E was infested with the beet-cyst nematode (Heterodera schachtii) to test the efficacy of nematicides against this pest.…”

mentioning

confidence: 99%

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Induction of Beet-Cyst Nematode Suppressiveness by the Fungi Dactylella oviparasitica and Fusarium oxysporum in Field Microplots

Olatinwo¹,

Borneman²,

Becker³

2006

Phytopathology®

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The ability of Dactylella oviparasitica and Fusarium oxysporum to suppress Heterodera schachtii numbers was examined in field microplots. Fungi were individually added to fumigated field soil that was seeded with sugar beet. Four weeks later, soils were infested with H. schachtii second-stage juveniles (J2). At two harvests, 11 weeks and 19 weeks (1,469 and 2,547 degree days (base 8°C), respectively) after nematode-infestation, H. schachtii cyst and egg numbers were assessed. At both time points, D. oviparasitica reduced H. schachtii population densities to those in the naturally suppressive soil, even when additional H. schachtii J2 were added to the microplots after the first harvest. Although F. oxy-sporum did not alter H. schachtii population densities after 11 weeks, significant reductions were detected after 19 weeks. The sustainability of the H. schachtii suppressiveness created by single applications of the fungi at the beginning of the microplot trials was further examined in a greenhouse study. Soil collected at the completion of the microplot trials was potted and seeded with sugar beet. Four weeks later, each pot was infested with H. schachtii J2. Approximately 16 weeks (1,389 degree days) after seeding, the D. oviparasitica-amended soil produced greater fresh root weights and considerably smaller nematode population densities than the nonamended control.

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