Movement Ecology of Pest <i>Helicoverpa</i>: Implications for Ongoing Spread

Jones, Christopher M.; Parry, Hazel Ruth; Tay, Wee Tek; Reynolds, D. R.; Chapman, Jason W.

doi:10.1146/annurev-ento-011118-111959

Cited by 91 publications

(85 citation statements)

References 123 publications

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“…Some pests, such as the cotton bollworm (Helicoverpa armigera Hübner), have now reached critical pest status because of their economic damage and rapid ability to invade new regions 18 . In particular, H. armigera is a major global pest of diverse agricultural and horticultural crops causing upwards of US $ 7 billion annually in crop losses 19 . This has, in part, prompted research into which crops may be at risk from H. armigera under predicted atmospheric CO 2 concentrations.…”

mentioning

confidence: 99%

Increased insect herbivore performance under elevated CO2 is associated with lower plant defence signalling and minimal declines in nutritional quality

Johnson

Waterman

Hall

2020

Sci Rep

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changes in insect herbivore performance under elevated atmosphere carbon dioxide concentrations e[co 2 ] are often driven by changes in the nutritional and defensive chemistry of their host plants. Studies addressing how the prolific pest cotton bollworm (Helicoverpa armigera) responds to e[co 2 ] show that performance usually declines, often associated with lower nutritional (e.g. nitrogen (N) concentrations) quality of host plants under e[CO 2 ]. We investigated the impacts of e[co 2 ] on nutritional quality and anti-herbivore (jasmonate) defensive signalling in lucerne (Medicago sativa) when challenged by H. armigera. While foliar n decreased under e[co 2 ], other aspects of nutritional quality (soluble protein, amino acids, foliar C:N) were largely unaffected, potentially due to increased root nodulation under e[co 2 ]. in contrast, e[co 2 ] greatly reduced jasmonate signalling in M. sativa following H. armigera attack; jasmonic acid concentrations were ca. 56% lower in attacked plants grown under e[co 2 ]. concurrent with this, relative growth rates of H. armigera were ca. 66% higher when feeding on e[co 2 ]-grown plants. in contrast with previous reports, which we meta-analytically summarise, we provide the first evidence that H. armigera performance can increase under e[co 2 ]. this may occur in plants, such as M. sativa, where e[co 2 ] has limited impacts on nutritional quality yet reduces jasmonate defence signalling. With global populations expected to reach 11.2 billion by 2,100 there is an urgent need to ensure future food security, a challenge which is complicated by global climate change 1. Invertebrate pests destroy enough food to feed a billion people a year 2 which has, in part, fuelled interest in understanding which pests may become more problematic under predicted changes in the Earth's climate 3. In particular, unprecedented increases in atmospheric carbon dioxide (CO 2) have the capacity to change plant chemistry which affect the susceptibility of crops to insect herbivores 4-6. The effects of elevated atmospheric CO 2 concentration (e[CO 2 ]) on plant nutritional and defensive chemistry, and their consequent effects on invertebrate herbivores, have received extensive attention 7-9. In terms of nutritional quality, nitrogen availability is considered to be the limiting factor in insect herbivore diets 10. Broadly speaking, e[CO 2 ] causes foliar nitrogen (N) concentrations to decrease due to one or more processes, including dilution effects (i.e. relative to increased carbohydrate concentrations), reduced N uptake by roots, increased NH 3 volatilization and reduced investment in the N-rich enzyme RUBISCO 11-14. The impacts of e[CO 2 ] on plant defences are less easily predicted, but some trends are emerging 5. Plant defences against herbivorous arthropods are regulated by several phytohormonal pathways, including the jasmonic acid (JA), salicylic acid (SA) and ethylene signalling pathways 15,16. Of these, the JA pathway is regarded as the master regulator of plant resistance to arthropod her...

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confidence: 99%

Increased insect herbivore performance under elevated CO2 is associated with lower plant defence signalling and minimal declines in nutritional quality

Johnson

Waterman

Hall

2020

Sci Rep

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“…This pattern may be common in other migratory insects, such as Helicoverpa spp. [44]. A population assignment test using the rst-generation migrant detection method revealed Yunnan as the main source of WBPH in Shandong following by other areas in the GMS (Table 6).…”

Section: Discussionmentioning

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Migration of Sogatella furcifera between the Greater Mekong Subregion and northern China revealed by mtDNA and SNP

Yang

Dong

Chen

et al. 2020

Preprint

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Background: The white-backed planthopper (WBPH), Sogatella furcifera (Horváth) (Hemiptera, Delphacidae), is a migratory pest of rice in Asia. Shandong Province, in northern China, is located on the migration pathway of WBPH between southern and northeast China. The potential sources of WBPH in northern China are poorly understood. We studied the sources of WBPH in Shandong Province by determining the population genetic structure of WBPH in 18 sites distributed in Shandong and in six regions of the Greater Mekong Subregion (GMS). We used mitochondrial gene and single-nucleotide polymorphism (SNP) markers for analysis.Results: All of the WBPH populations studied in the seven regions had low genetic diversity. Pairwise FST values ranged from -0.061 to 0.285, while FST based on SNP data ranged from -0.007 to 0.009. These two molecular markers revealed that 4.40% (mtDNA) and 0.19% (SNP) genetic variation could be explained by the interpopulation variation, while the rest came from intrapopulation variation. The populations in the seven geographic regions comprised four hypothetical genetic clusters (K = 4) not associated with geographic location. Eighty-four of 129 individuals distributed across the given area were designated as recent migrants or of admixed ancestry. Although the substantial migration presented, a weak but significant correlation between genetic and geographic distances was found (r = 0.083, P = 0.004).Conclusion: The Greater Mekong Subregion was the main genetic source of WBPH in Shandong, while other source populations may also exist. The genetic structure of WBPH is shaped by both migration and geographic barriers. These results help clarify the migration route and the source of WBPH in northern China.

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Section: Population Genetic Structure Of Wbphmentioning

confidence: 99%

Immigration of Sogatella Furcifera from the Greater Mekong Subregion into Northern China Revealed by 2b-RAD Sequencing

Yang¹,

Dong²,

Chen³

et al. 2020

Preprint

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Background The white-backed planthopper (WBPH), Sogatella furcifera (Horváth) (Hemiptera, Delphacidae), is a migratory pest of rice in Asia. Shandong Province, in northern China, is located on the migration pathway of WBPH between southern and northeast China. The potential sources of WBPH in northern China are poorly understood. We studied the sources of WBPH in Shandong Province by determining the population genetic structure of WBPH in 18 sites distributed in Shandong and in six regions of the Greater Mekong Subregion (GMS). We used mitochondrial gene and single-nucleotide polymorphism (SNP) markers (2b-RAD sequencing) for analysis.Results All of the WBPH populations studied in the seven regions had low genetic diversity. Pairwise FST values ranged from − 0.061 to 0.285, while FST based on SNP data ranged from − 0.007 to 0.009. These two molecular markers revealed that 4.40% (mtDNA) and 0.19% (SNP) genetic variation could be explained by the interpopulation variation, while the rest came from intrapopulation variation. The populations in the seven geographic regions comprised four hypothetical genetic clusters (K = 4) not associated with geographic location. Eighty-four of 129 individuals distributed across the given area were designated as recent migrants or of admixed ancestry. Although the substantial migration presented, a weak but significant correlation between genetic and geographic distances was found (r = 0.083, P = 0.004).Conclusion GMS was the main source of WBPH in Shandong, while other source populations may also exist. The genetic structure of WBPH is shaped by both migration and geographic barriers. These results help clarify the migration route and the source of WBPH in northern China.

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Movement Ecology of Pest Helicoverpa: Implications for Ongoing Spread

Cited by 91 publications

References 123 publications

Increased insect herbivore performance under elevated CO2 is associated with lower plant defence signalling and minimal declines in nutritional quality

Increased insect herbivore performance under elevated CO2 is associated with lower plant defence signalling and minimal declines in nutritional quality

Migration of Sogatella furcifera between the Greater Mekong Subregion and northern China revealed by mtDNA and SNP

Immigration of Sogatella Furcifera from the Greater Mekong Subregion into Northern China Revealed by 2b-RAD Sequencing

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