GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 Post-plant nematicide timing for northern root-knot nematode in Washington wine grapes

Post-plant nematicide timing for northern root-knot nematode in Washington wine grapes

Abstract

Context and purpose of the study – Vigor declines in older vineyards and poor vine establishment in replant situations have been attributed to plant-parasitic nematodes. The northern root-knot nematode, Meloidogyne hapla, is the most prevalent plant-parasitic nematode species found in Washington wine grape vineyards. Management for nematodes in established vineyards is limited to the application of post-plant nematicides. We are evaluating new nematicides that are currently not registered in grape for their efficacy in controlling M. hapla and a part of that evaluation includes improving the alignment of nematicide application timing with the vulnerable second-stage juvenile (J2) life stage of M. hapla. Work done concurrently with this research found that M. hapla J2 are at their lowest density in midsummer, increase to a maximum density between October and March, then decline over spring and early summer (East et al., in press). The influence of product timing on its efficacy will be presented.

Materials and methods – Five vine plots in a Vitis vinifera ‘Riesling’ vineyard were soil sampled for M. hapla J2 in spring 2016 to establish baseline nematode densities. Nematicide treatments of fluazaindolizine (Salibro, total acre rate) and fluensulfone (Nimitz, treated acre rate) were applied according to manufacturer recommendations once in spring 2016; each treatment had four replicate plots. In spring 2017, an additional three spring Salibro treatments, calculated from treated acre rather than total acreage were added: full rate, half rate, and half rate applied twice; and a Nimitz treatment (half rate applied in spring and fall). In spring 2018, a second vineyard site planted to ‘Chardonnay’ was added, with Salibro treatments calculated from treated acre: full rate in spring, half rate in spring, full rate in fall, and half rate in spring and fall. Soil was sampled in each plot to measure M. hapla J2 densities in spring and fall from 2016 through 2018. Dormant pruning weights and whole vine yield were measured to assess effect of nematicide treatments on vine growth.

Results – The total acre rate of Salibro had lower densities of M. hapla J2 than the untreated control in fall 2016, 2017, and 2018 at the Riesling vineyard. Unfortunately, this is not a rate that will be legally registered. The half rate applied twice spring treatment was only effective starting fall of 2018, after two years of application. In fall 2018, both full rate in spring and half rate in spring treatments reduced J2 densities at the Chardonnay vineyard. No other Salibro or any of the Nimitz treatments reduced M. hapla J2 densities. Vine parameters were not affected by nematicide treatments. Spring 2019 results will be available at time of presentation, and we are particularly interested in the longer-term effects of fall-applied treatments.

DOI:

Publication date: March 11, 2024

Issue: GiESCO 2019

Type: Poster

Authors

Katherine E. EAST1*, Inga ZASADA2, Michelle M. MOYER1

1 Dept. of Horticulture, Washington State University, Irrigated Agriculture Research and Extension Center, Prosser, WA, USA
2 USDA-ARS, Horticultural Crops Research Laboratory, Corvallis, OR, USA

Contact the author

Keywords

Root-knot nematode, Vitis vinifera, Meloidogyne hapla

Tags

GiESCO | GiESCO 2019 | IVES Conference Series

Citation

Related articles…

The influence of climate on the grapevine phenology and content of sugar and total acids in the must

For the period of 10 years in the condition of Skopje vineyard area, at two regional (Vranec and Smederevka) and two international (Cabernet sauvignon and Chardonnay) grapevine cultivars, the researches are done.

Analysis of Cabernet Sauvignon and Aglianico winegrape (V. vinifera L.) responses to different pedo-climatic environments in southern Italy

Water deficit is one of the most important effects of climate change able to affect agricultural sectors. In general, it determines a reduction in biomass production, and for some plants, as in the case of grapevine, it can endorse fruit quality. The monitoring and management of plant water stress in the vineyard

Influence of the vintage, clone and rootstock on the chemical characteristics of Syrah tropical wines from Brazil

In the Northeast of Brazil, vines can produce twice a year, because annual average temperature is 26ºC, with high solar radiation and water availability for irrigation.

Counting grape bunches using deep learning under different fruit and leaf occlusion conditions

Yield estimation is very important for the wine industry since provides useful information for vineyard and winery management. The early yield estimation of the grapevine provides information to winegrowers in making management decisions to achieve a better quantity and quality of grapes. In general, yield forecasts are based on destructive sampling of bunches and manual counting of berries per bunch and bunches per vine.

Phenolic composition of Tempranillo Blanco grapes changes after foliar application of urea

Our research aimed to determine the effect and efficiency of foliar application of urea on the phenolic composition of Tempranillo Blanco grapes. The field experiment was carried out in 2019 and 2020 seasons and the plot was located in D.O.Ca Rioja (North of Spain). The vineyard was Vitis vinifera L. Tempranillo Blanco and grafted on Richter-110 rootstock. The treatments were control (C), whose plants were sprayed with water and three doses of urea: plants were sprayed with urea 3 kg N/ha (U3), 6 kg N/ha (U6) and 9 kg N/ha (U9). The applications were performed in two phenological stages, pre-veraison (Pre) and veraison (Ver). Also, each of the treatments was repeated one week later. Control and treatments were performed in triplicate and arranged in a randomised block design. Grapes were harvested at optimum ripening stage. High-performance liquid chromatography was used to analyse the phenolic composition of the grapes. Finally, the results obtained from the analytical determinations – flavonols, flavanols and non-flavonoid (hydroxybenzoic acids, hydroxycinnamic acids and stilbenes) – were studied statistically by analysis of variance. The results showed that, in 2019, U6-Pre and U9-Pre treatments increased the hydroxybenzoic acid content in grapes, and also all foliar treatments applied at Pre enhanced the stilbene concentration. Moreover, U3-Ver was the only treatment that rose flavonol and stilbene contents in the Tempranillo Blanco grapes. In 2020, all treatments applied at Pre enhanced the flavonol concentration in grapes. Furthermore, U3-Pre and U9-Pre treatments increased stilbene content in grapes. Nevertheless, the hydroxybenzoic acid content was improved by U6-Ver and U9-Ver and besides, hydroxycinnamic acid concentration in grapes was increased by all treatments applied at Ver. In conclusion, the lower and highest dose of urea (U3 and U9), applied at pre-veraison, were the best treatments to improve the Tempranillo Blanco grape phenolic composition.