Combining Cultural Tactics and Insecticides for the Management of the Sweetpotato Whitefly, Bemisia tabaci MEAM1, and Viruses in Yellow Squash

LaTora, Angela Gabrielle; Codod, Clarence B.; Legarrea, Saioa; Dutta, Bhabesh; Kemerait, Robert C.; Adkins, Scott; Turechek, William W.; Coolong, Timothy; Silva, André Luiz Biscaia Ribeiro da; Srinivasan, Rajagopalbabu

doi:10.3390/horticulturae8040341

Cited by 13 publications

(10 citation statements)

References 81 publications

(146 reference statements)

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“…Defense elicitors delayed the expression of Cassava mosaic disease (CMD) symptoms in Nicotiana benthamiana and of TYLCV in tomato under controlled conditions [ 13 , 15 ]. However, treating squash seedlings with acibenzolar-S-methyl under greenhouse conditions did not reduce the incidence of cucurbit leaf crumple virus (CuLCrV) [ 55 ]. Given that begomoviruses are phloem-limited, the translocation of defense factors to the phloem may be a critical factor that may determine the success of this approach.…”

Section: Discussionmentioning

confidence: 99%

Begomovirus Transmission to Tomato Plants Is Not Hampered by Plant Defenses Induced by Dicyphus hesperus Knight

Legarrea,

LaTora,

Simmons

et al. 2024

Viruses

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Plants can respond to insect infestation and virus infection by inducing plant defenses, generally mediated by phytohormones. Moreover, plant defenses alter host quality for insect vectors with consequences for the spread of viruses. In agricultural settings, other organisms commonly interact with plants, thereby inducing plant defenses that could affect plant–virus–vector interactions. For example, plant defenses induced by omnivorous insects can modulate insect behavior. This study focused on tomato yellow leaf curl virus (TYLCV), a plant virus of the family Geminiviridae and genus Begomovirus. It is transmitted in a persistent circulative manner by the whitefly Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae), posing a global threat to tomato production. Mirids (Hemiptera: Miridae) are effective biological control agents of B. tabaci, but there is a possibility that their omnivorous nature could also interfere with the process of virus transmission. To test this hypothesis, this study first addressed to what extent the mirid bug Dicyphus hesperus Knight induces plant defenses in tomato. Subsequently, the impact of this plant–omnivore interaction on the transmission of TYLCV was evaluated. Controlled cage experiments were performed in a greenhouse setting to evaluate the impact of mirids on virus transmission and vector acquisition by B. tabaci. While we observed a reduced number of whiteflies settling on plants exposed to D. hesperus, the plant defenses induced by the mirid bug did not affect TYLCV transmission and accumulation. Additionally, whiteflies were able to acquire comparable amounts of TYLCV on mirid-exposed plants and control plants. Overall, the induction of plant defenses by D. hesperus did not influence TYLCV transmission by whiteflies on tomato.

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Section: Discussionmentioning

confidence: 99%

Begomovirus Transmission to Tomato Plants Is Not Hampered by Plant Defenses Induced by Dicyphus hesperus Knight

Legarrea,

LaTora,

Simmons

et al. 2024

Viruses

Self Cite

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“…These crops are produced mainly in the southern region and are highly desirable hosts for B. tabaci . Moreover, B. tabaci serves as a vector for many viruses that cause diseases in these crops with significant economic damage [ 17 , 18 ]. Cucurbits are customarily cultivated in succession or adjacent to cotton during the warmest parts of the year, allowing a continuous migration of whiteflies between these different crop systems.…”

Section: Discussionmentioning

confidence: 99%

Determining Field Insecticide Efficacy on Whiteflies with Maximum Dose Bioassays

Cremonez

Perier

Simmons

et al. 2023

Insects

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We conducted a rapid bioassay method to assess insecticide efficacy for controlling adult sweetpotato whitefly Bemisia tabaci in squash and cucumber crops before insecticide applications. The study aimed to evaluate the accuracy of a 24-hour laboratory bioassay in determining maximum dose insecticide efficacy in the field. Ten insecticides were evaluated using leaf-dip bioassays, and their effectiveness was tested across eight cucurbit field experiments in Georgia, USA, during the 2021 and 2022 field seasons. The maximum dose, defined as the highest labeled rate of an insecticide diluted in the equivalent of 935 L ha−1 of water, was used for all bioassays. Adult survival observed in the bioassay was compared to adult field count-based survival 24 h after treatment. A low concentration (1/10 rate) was used for imidacloprid, flupyradifurone, pyriproxyfen, and cyantraniliprole to assess insecticide tolerance in the whitefly population. Overall, significant positive correlation between laboratory bioassay and field efficacy was reported, explaining 50–91% of the observed variation. The addition of the low dosage was helpful, indicating that no rate response was consistent with susceptibility to the tested insecticide, while a rate response was associated with a loss of susceptibility between 2021 and 2022.

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“…Several management tactics aimed at reducing the impacts of B. tabaci MEAM1 and whitefly-transmitted viruses were evaluated in Georgia. Among them, insect exclusion netting (IEN) significantly reduces whiteflies and virus incidence on squash seedlings in the greenhouse [108]. In the field, lower whitefly abundance and reduced virus symptom severity, were observed in plots with UV-reflective mulch when compared to white plastic or live mulch.…”

Section: Disease Management and Controlmentioning

confidence: 99%

“…In the field, lower whitefly abundance and reduced virus symptom severity, were observed in plots with UV-reflective mulch when compared to white plastic or live mulch. Overall, field plots with row covers and those with UV-reflective mulch consistently produced the greatest marketable yields [108]. Growers can reduce whitefly and virus pressure by combining these cultural tactics, and selecting insecticides to preserve yields in squash production in the southeastern US [108].…”

Section: Disease Management and Controlmentioning

confidence: 99%

Whitefly-Transmitted Viruses of Cucurbits in the Southern United States

Devendran,

Kavalappara,

Simmons

et al. 2023

Viruses

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Cucurbits are economically important crops that are widely cultivated in many parts of the world, including the southern US. In recent years, higher temperatures have favored the rapid build-up of whiteflies in the fall-grown cucurbits in this region. As a result, whitefly-transmitted viruses (WTVs) have severely impacted the marketable yield of cucurbits. In this review, we discuss three major groups of WTVs negatively impacting cucurbit cultivation in the southern US, including begomoviruses, criniviruses, and ipomoviruses. Here, we discuss the available information on the biology, epidemiology and advances made toward detecting and managing these viruses, including sources of resistance and cultural practices.

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Combining Cultural Tactics and Insecticides for the Management of the Sweetpotato Whitefly, Bemisia tabaci MEAM1, and Viruses in Yellow Squash

Cited by 13 publications

References 81 publications

Begomovirus Transmission to Tomato Plants Is Not Hampered by Plant Defenses Induced by Dicyphus hesperus Knight

Begomovirus Transmission to Tomato Plants Is Not Hampered by Plant Defenses Induced by Dicyphus hesperus Knight

Determining Field Insecticide Efficacy on Whiteflies with Maximum Dose Bioassays

Whitefly-Transmitted Viruses of Cucurbits in the Southern United States

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