Host Plant Associations of<i>Anagrus</i>spp. (Hymenoptera: Mymaridae) and<i>Erythroneura elegantula</i>(Hemiptera: Cicadellidae) in Northern California

Wilson, H. F.; Miles, Albie; Daane, Kent M.; Altieri, Miguel A.

doi:10.1093/ee/nvw033

Cited by 12 publications

(4 citation statements)

References 58 publications

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“…on the perennial Baccharis pilularis, which produces abundant nectar. We agree with Wilson et al (2016) that the impact of alternative vegetation on Anagrus spp. will depend on the type and frequency of favored Anagrus spp.…”

Section: Figure 9 Regression Of Log10supporting

confidence: 90%

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Influence of Vineyard Vegetational Borders on Western Grape Leafhopper (Erythroneura elegantula Osborn), its Egg Parasitoids (Anagrus spp.) and Generalist Insect Predators

Costello

Thrupp²,

McGourty³

2021

SAJEV

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Studies have shown that vegetational diversity in or around cropping systems can enhance natural enemy abundance, although the impact on herbivores is less certain. We studied the influence of vineyard vegetational borders on density of the western grape leafhopper, Erythroneura elegantula, its major parasitoids, Anagrus spp., and two generalist predators, Orius spp. and Leptothrips mali. Two study vineyards had planted, perennial flowering hedgerows, one bordered a natural riparian zone, and one had a sparse border of native trees. From April to September 2007, we counted leafhopper nymphs and adults of Anagrus spp., Orius spp. and L. mali within 10 m of the border, and at additional 20 m intervals up to 90 m. At two sites with a diverse border, leafhopper density was stable nearest the border; at other distances leafhopper density decreased between the first and second generations. This effect was not seen at the sparse border site. Anagrus spp. density was enhanced at one site with a diverse border, but only late season. There was no border effect on the generalist insect predators, by site or early vs. late season. Regression analysis showed a positive relationship between leafhopper and Anagrus spp. density, suggesting that the parasitoids were responding to higher leafhopper density. We conclude that, depending on the nature of the border vegetation, there can be an effect on leafhopper nymphal density, but in this study there is no evidence that it was due to natural enemies.

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Section: Figure 9 Regression Of Log10supporting

confidence: 90%

“…density, and we found similar results with a cover crop of alyssum (Lobularia maritima) (Costello, Thrupp & McGourty, unpublished data). Wilson et al (2016) found high winter and spring abundance of Anagrus spp. on the perennial Baccharis pilularis, which produces abundant nectar.…”

Section: Figure 9 Regression Of Log10mentioning

confidence: 90%

Influence of Vineyard Vegetational Borders on Western Grape Leafhopper (Erythroneura elegantula Osborn), its Egg Parasitoids (Anagrus spp.) and Generalist Insect Predators

Costello

Thrupp²,

McGourty³

2021

SAJEV

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“…Moreover, while some adult parasitoids are dependent on nectar and/or pollen for food (Heimpel & Jervis, ), plant species can vary widely in their ability to provide these resources (Wäckers, ). A final point is that the current study was conducted in the more arid San Joaquin Valley, where suitable overwintering habitats and hosts are lacking compared with vineyards studied in northern California (Wilson, Miles, Daane, & Altieri, , ) and New York (English‐Loeb et al., ).…”

Section: Discussionmentioning

confidence: 99%

Native grass ground covers provide multiple ecosystem services in Californian vineyards

Daane

Hogg²,

Wilson

et al. 2018

Journal of Applied Ecology

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Mechanisms responsible for the success or failure of agricultural diversification are often unknown. Most studies of arthropod pest management focus on enhancing natural enemy effectiveness. However, non‐crop plants can also change crop host quality by reducing or adding soil nutrients or water, and therefore improve or hamper pest suppression. Native perennial ground covers may provide food or habitat to natural enemies and, in terms of competition for soil nutrients or water, be more compatible with crop management than exotic annuals. We conducted a 3‐year vineyard study to examine the impacts of native perennial grasses on pests, natural enemies, crop plant condition and soil properties. We included three ground cover treatments: bare soil with a grower standard drip irrigation; native grasses with drip irrigation; and native grasses with drip irrigation as well as an additional flood irrigation to keep the grasses green and growing during the season. Numbers of leafhopper pests Erythroneura spp. decreased in both native grass treatments, where parasitism rates were higher. Vine petiole nitrate levels were lower in grass treatments, indicating competition for soil nitrogen, which is most often considered to be detrimental. Berry weight was higher in the irrigated treatment but did not differ between the bare soil and non‐irrigated grass treatment. Grape °Brix was similar in the bare soil and native grass treatments, suggesting native grasses did not compromise grape quality. In fact, leaf water stress was lower and soil moisture higher not only in the irrigated grass treatment but, at times, in the non‐irrigated grass treatment, compared with the bare soil treatment. Synthesis and applications. Our work shows that native grasses contribute to a reduction in vineyard leafhopper pests by reducing host quality through competition for soil nitrogen and providing food resources and/or habitat for natural enemies. Native grasses also improve soil water content and may be part of a water conservation program for perennial crops in dry climate regions.

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“…The high parasitoid abundance on rosemary (ORG) hedgerows can be attributed to Anagrus spp. (Mymaridae), an egg parasitoid of the Ligurian leafhopper Eupteryx decemnotata Rey (Hemiptera: Cicadellidae) [62]. This typhlocybid leafhopper was recorded in high numbers on rosemary and sage hedgerows; however, symptoms of infestation (yellowing) were observed only on rosemary leaves.…”

Section: Discussionmentioning

confidence: 99%

Potential of Hedgerows with Aromatic Plants as Reservoirs of Natural Enemies of Pests in Orange Orchards

Stathakis

Economou

Barda

et al. 2023

Insects

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In the present study, the potential of hedgerows from Mediterranean aromatic plant species, i.e., oregano, rosemary, sage, and savory, in orange field margins to function as reservoirs of natural enemies of citrus pests was tested in comparison to the common management practice of bare soil or weed vegetation. Assessments were based on the abundance and diversity of parasitoid wasps, spiders, and insect predators in the field margins and on the orange trees for two growing seasons. Savory plants harbored more parasitoids compared to weed vegetation and the other aromatic plants (savory > organic rosemary > sage > oregano). Weed vegetation hosted more arachnid predators than the aromatic plants in their first year in the orchard, but this was reversed with their full growth in the following year (most abundant on rosemary). Oregano and sage favor insect predators. The similarity of the natural enemy communities on the field margins and on the orange trees increased with time, indicating the insects’ movement from the field margins to the trees. The results support the use of the tested aromatic plant species in conservation practices for targeted groups of beneficial arthropods in orange orchards, also considering the exploitation of suitable wild flowering plants of the weed flora.

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Host Plant Associations ofAnagrusspp. (Hymenoptera: Mymaridae) andErythroneura elegantula(Hemiptera: Cicadellidae) in Northern California

Cited by 12 publications

References 58 publications

Influence of Vineyard Vegetational Borders on Western Grape Leafhopper (Erythroneura elegantula Osborn), its Egg Parasitoids (Anagrus spp.) and Generalist Insect Predators

Influence of Vineyard Vegetational Borders on Western Grape Leafhopper (Erythroneura elegantula Osborn), its Egg Parasitoids (Anagrus spp.) and Generalist Insect Predators

Native grass ground covers provide multiple ecosystem services in Californian vineyards

Potential of Hedgerows with Aromatic Plants as Reservoirs of Natural Enemies of Pests in Orange Orchards

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