<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Fumigant use in perennial crops can be reduced through prolonging the life of existing orchards. The longer an orchard remains healthy and productive, the less often it will be terminated, fumigated, and replanted. Two trials were conducted to determine the effectiveness of DiTera, a toxin produced by the fungus (<italic>Myrothecium verrucaria)</italic> and Nema-Q, an extract of the soap bark tree (<italic>Quillaja saponaria</italic>) for management of root-lesion (<italic>Pratylenchus vulnus</italic>) and ring (<italic>Mesocriconema xenopla)</italic> nematodes on walnuts. In the first trial, spring and fall treatments of DiTera were applied each year for four years to variety ‘Chandler’ scion on seedling ‘Paradox’ rootstock, and to own-rooted ‘Chandler’ trees. On ‘Paradox’ rootstock, both DiTera and Nema-Q increased walnut yields (<italic>P</italic> ≤ 0.05) and produced more vigorous trees (<italic>P</italic> ≤ 0.05) without significant reductions in nematode populations (<italic>P</italic> ≤ 0.05). A second trial was conducted with three rates of DiTera and four rates of Nema-Q, combinations of the two products, and an untreated control on ‘Chandler’ scion on ‘Paradox’ rootstock. The highest rate of Nema-Q (<italic>P</italic> ≤ 0.05), and a combination treatment of DiTera plus Nema-Q (<italic>P</italic> ≤ 0.05) increased trunk circumference. Several treatments showed reductions in root-lesion and ring nematodes (<italic>P</italic> ≤ 0.05). Bionematicides can improve yield, growth, and vigor in walnut orchards infested with plant-parasitic nematodes.</p>
</abstract>

Fumigant use in perennial crops can be reduced through prolonging the life of existing orchards. The longer an orchard remains healthy and productive, the less often it will be terminated, fumigated, and replanted. Two trials were conducted to determine the effectiveness of DiTera, a toxin produced by the fungus (Myrothecium verrucaria) and Nema-Q, an extract of the soap bark tree (Quillaja saponaria) for management of root-lesion (Pratylenchus vulnus) and ring (Mesocriconema xenopla) nematodes on walnuts. In the first trial, spring and fall treatments of DiTera were applied each year for four years to variety ‘Chandler’ scion on seedling ‘Paradox’ rootstock, and to own-rooted ‘Chandler’ trees. On ‘Paradox’ rootstock, both DiTera and Nema-Q increased walnut yields (P ≤ 0.05) and produced more vigorous trees (P ≤ 0.05) without significant reductions in nematode populations (P ≤ 0.05). A second trial was conducted with three rates of DiTera and four rates of Nema-Q, combinations of the two products, and an untreated control on ‘Chandler’ scion on ‘Paradox’ rootstock. The highest rate of Nema-Q (P ≤ 0.05), and a combination treatment of DiTera plus Nema-Q (P ≤ 0.05) increased trunk circumference. Several treatments showed reductions in root-lesion and ring nematodes (P ≤ 0.05). Bionematicides can improve yield, growth, and vigor in walnut orchards infested with plant-parasitic nematodes.

<article-title xml:lang="en">Bionematicides as an alternative to methyl bromide fumigation

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Bionematicides as an alternative to methyl bromide fumigation

Fumigant use in perennial crops can be reduced through prolonging the life of existing orchards. The longer an orchard remains healthy and productive, the less...

Bionematicides as an alternative to methyl bromide fumigation

Published Online: Apr 12, 2021

Page range: 1 - 10

DOI: https://doi.org/10.21307/jofnem-2021-044

Keywords
Biological Control, DiTera, Management, Nema-Q, Nematode, Walnut

© 2021 B. B. Westerdahl et al., published by Sciendo.

This work is licensed under the Creative Commons Attribution 4.0 International License.

Bionematicides as an alternative to methyl bromide fumigation

Published Online: Apr 12, 2021

Page range: 1 - 10

DOI: https://doi.org/10.21307/jofnem-2021-044

KeywordsBiological Control, DiTera, Management, Nema-Q, Nematode, Walnut

© 2021 B. B. Westerdahl et al., published by Sciendo.

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Biological Control, DiTera, Management, Nema-Q, Nematode, Walnut