Effects of a plant extract-based nematicide (G8014S) and its components on the host finding behaviour and multiplication of Globodera pallida on glasshouse-grown potatoes

Danquah, W.B., Grove, I.G., Back, M.A. and Haydock, P.P.J. (2013) Effects of a plant extract-based nematicide (G8014S) and its components on the host finding behaviour and multiplication of Globodera pallida on glasshouse-grown potatoes. Nematology, 15. pp. 821-834.

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Abstract

In vitro and glasshouse studies were initiated to determine the mechanisms of action of an aqueous garlic extract, salicylaldehyde, a nonylphenol ethoxylate surfactant and a formulation (G8014S) containing these substances on the potato cyst nematode Globodera pallida. The effects of these substances on host finding and migration of second-stage juveniles (J2) were assessed by investigating their ability to migrate through a sand column and towards potato roots in Pluronic F-127 gel. The garlic extract was shown to be the least disruptive to J2 host finding, reducing attraction by between 13 and 24% at concentrations of 7840 μl l−1 and 983 μl l−1, respectively. By contrast, a reduction of approximately 38% in J2 attraction to roots was achieved by treating J2 with 344 μl l−1 of G8014S. Of all the substances tested, salicylaldehyde was the least attractive to G. pallida J2 (4.1%) while the garlic extract and oxamyl treatments attracted 43.5 and 28.9% J2, respectively. In glasshouse experiments, different rates of the test substances were compared with the nematicide oxamyl for their effects on the in-soil hatch, egg viability and multiplication of G. pallida. The effect of treatment with 220.16 l ha−1 of G8014S on G. pallida multiplication in the glasshouse was comparable to that of oxamyl causing a five-fold reduction in PCN multiplication relative to the water control. These results provide evidence to support the potential of the formulation for the control of G. pallida in potatoes.

Item Type: Article
Divisions: Crop and Environment Sciences
Depositing User: Mr Darren Roberts
Date Deposited: 08 Aug 2018 09:33
Last Modified: 31 Aug 2018 13:22
URI: http://hau.repository.guildhe.ac.uk/id/eprint/17073

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