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Identification of Vitis Cultivars, Rootstocks, and Species Expressing Resistance to a Planococcus Mealybug

1
USDA ARS, San Joaquin Valley Agricultural Sciences Center, Parlier, CA 93611, USA
2
E. & J. Gallo Winery, Modesto, CA 95354, USA
3
Department of Environmental Science, Policy, and Management, University of California Berkeley, Berkeley, CA 94720-3114, USA
*
Author to whom correspondence should be addressed.
Insects 2020, 11(2), 86; https://doi.org/10.3390/insects11020086
Received: 9 September 2019 / Revised: 17 January 2020 / Accepted: 23 January 2020 / Published: 28 January 2020
Mealybugs cause economic loss to vineyards through physical damage, fouling fruit and leaves with honeydew, and the transmission of viruses. Planococcus ficus is one of several mealybug species in vineyards, and one that causes economic damage over a relatively large global range. To develop novel management tools, host resistance to P. ficus, which has not previously been identified for any grape cultivars, was studied. Ten grape lines (species, cultivars, and rootstocks) were evaluated for P. ficus resistance across two separate potted plant assays. Significant differences were detected among cultivars and rootstocks in the recorded number of P. ficus juveniles, adults, and egg sacs. Cabernet Sauvignon and Chardonnay were two of the most favorable grape cultivars for mealybug population growth, whereas rootstocks IAC 572, 10-17A, and RS-3 all demonstrated some level of resistance. Southern fire ant (Solenopsis xyloni) was positively associated with mealybug populations, but did not have a negative effect on the observed presence of other arthropod species including potential predators.
Keywords: host plant resistance; pest management; Planococcus ficus; vineyard host plant resistance; pest management; Planococcus ficus; vineyard
MDPI and ACS Style

Naegele, R.P.; Cousins, P.; Daane, K.M. Identification of Vitis Cultivars, Rootstocks, and Species Expressing Resistance to a Planococcus Mealybug. Insects 2020, 11, 86.

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