Landscape effects on the abundance and larval diet of the polyphagous pest <i>Helicoverpa armigera</i> in cotton fields in North Benin

Tsafack, Noelline; Alignier, Audrey; Head, Graham P.; Kim, Jae; Goulard, Michel; Menozzi, Philippe; Ouin, Annie

doi:10.1002/ps.4197

Cited by 10 publications

(5 citation statements)

References 58 publications

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“…The term landscape has been variably applied in the context of Helicoverpa spp. by previous authors (Dillon et al , 1998; Tsafack et al , 2013, 2016; Schellhorn & Paull, 2013; Liu et al , 2016 a , b ) (e.g. study areas ranging from 500 m in radius to 10 km radius have been used).…”

Section: Methodsmentioning

confidence: 99%

“…C 3 and C 4 plants possess different photosynthetic pathways and thus differ in the relative abundance of naturally occurring, stable carbon isotopes ( 13 C, 12 C) they pass on to insect herbivores feeding on them (Smith & Epstein, 1971; O'Leary, 1988; Ambika et al , 2005). Several authors (Gould et al , 2002; Head et al , 2010; Brévault et al , 2012; Baker & Tann, 2013; Ye et al , 2015; Tsafack et al , 2016) have used these carbon isotope signatures (often referred to as delta C or δ 13 C) as natural markers to trace the plant host origins of captured lepidopteran moths i.e. where they fed as larvae.…”

Section: Introductionmentioning

confidence: 99%

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Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

Baker

Tann

Verwey

et al. 2018

Bull. Entomol. Res.

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The use of Bt cotton varieties has greatly reduced the amount of conventional insecticides required to control lepidopteran pests, Helicoverpa armigera and Helicoverpa punctigera, in Australia, but the possibility that these moths might become resistant to Bt remains a threat. Consequently, a Resistance Management Plan, which includes the mandatory growing of refuge crops (pigeon pea and non-Bt cotton; both C3 plants), has been established for Bt cotton farmers. However, knowledge of the relative contributions made to overall moth populations from the many host origins (both C3 and C4 plants) available to these insects throughout cotton production regions remains limited, as do the scales of movement and spatial mixing of moths within and between these areas. This study used stable isotope signatures (in particular δ13C) to help identify where moths fed as larvae within separate cotton production regions which differed in their proportions of C3 and C4 host crops (e.g. cotton and sorghum, respectively). C3-derived moths predominated in the early season, but C4-derived moths increased in frequency later. The overall proportion of C4 moths was higher in H. armigera than in H. punctigera. Whilst the relative proportions of C3 and C4 moths differed between regions, no differences in such proportiorns were found at smaller spatial scales, nor were there significant correlations between crop composition and isotope signatures in moths. Overall, these results suggest that C4 host plants are likely to be very important in offsetting the development of Bt resistance in these insects and such influences may operate across multiple regions within a single growing season.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

Baker

Tann

Verwey

et al. 2018

Bull. Entomol. Res.

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“…Plants with different photosynthetic pathways (C 3 versus C 4 plants) have distinctly different carbon isotope ratios that leave isotopic signatures in the inert tissues (such as wings) of herbivores feeding on them. Stable carbon isotopes can be used to identify the category of the natal host plant (i.e., the larval diet) of H. armigera adults, discriminating individuals that fed on C 3 plants from those that fed on C 4 plants (Gould et al, 2002;Tsafack et al, 2016). For larvae of the overwintering generation of H. armigera, both C 3 (mainly vegetables, peanut, and soybean) and C 4 (mainly maize) host plants are available in the study agroecosystem.…”

Section: Study Area and Experimental Designmentioning

confidence: 99%

Long-term expansion of cereal crops promotes regional population increase of polyphagous Helicoverpa armigera

Yang,

Li,

Liu

et al. 2024

J Pest Sci

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Changes in land use is an important driver of insect pest population dynamics, but the long-term effects of land use may be contingent on changes in some factors. To identify potential effects of change in cropping pattern on agricultural pest population trends, data from large temporal and spatial scales are needed but are rarely available. Here, we use long-term pest monitoring data across a regional scale and across independent gradients of land-use intensity at the landscape level, to investigate the effects of the expansion of area devoted to major cereal crops on population trends of polyphagous Helicoverpa armigera in northern China. We found that an increased proportion of the land planted to maize and wheat in the landscape had an indirectly positive effect on the abundance of the summer population of H. armigera by increasing the population abundance of the preceding spring generations. Stable carbon isotope analysis suggested that maize acted as the source habitat for H. armigera population in the growing season. At the regional level, long-term expansion of maize and wheat production, as well as the contraction of cotton area, were associated with an increased density of H. armigera in spring generations across years, although temperature and precipitation factors also had signi cant effects on pest population sizes. These results across both temporal and spatial scales indicated that, in addition to Bt cotton contraction, increased cereal crops cultivation was an important driver of the H. armigera population increases in recent decades in northern China.

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“…The influence of the availability of vital resources, such as hosts, has recently received attention for pest dynamics (Ben-Hamo et al, 2020;Blank et al, 2019;Goldshtein et al, 2020;Krasnov et al, 2019). Statistical and spatial analysis was used in several studies to forecast pest population dynamics in complex heterogeneous landscapes, (Ives et al, 2017;Ricci et al, 2009;Rusch et al, 2016;Tsafack et al, 2016). Nonetheless, empirical data in commercial fields were rarely examined (Gavriel et al, 2012;Prasifka et al, 2009;Rahman & Broughton, 2019).…”

Section: Introductionmentioning

confidence: 99%

Empirical evidence of the mediterranean fruit fly movement between orchard types

Krasnov

Cohen

Goldshtein

et al. 2021

J Applied Entomology

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Understanding species movement in the agroecological system is an important theme in ecology. A mark-release-capture experiment was conducted to study the dispersion behaviour of the Mediterranean fruit fly, Ceratitis capitata (Wied.; Diptera: Tephritidae; Medfly) in northern Israel. Four pairs of pear and citrus orchards were selected for the field experiments. Sterile flies dyed with different colours were released in three seasons during 2015 and 2016, based on the phenological stages of the hosts. The total number of captured marked sterile flies per trap (FT) was approx 300 in both April and August. In November, FT values decreased by about 35% to approximately 200. The wild Medfly that were also captured showed an opposite trend, from an FT of 1.8 and 6.4 in April and August, respectively, to an FT of about 330 in November. Marked sterile flies were captured in both the release and the neighbouring orchard sites. We found that the Medfly migrates from pear to citrus orchards during spring and from citrus to pear during summer, when there are no fruit-bearing trees in the orchards. However, during November, when the wild Medfly population prevails in the area, a clear pattern of migration is hard to identify, perhaps because of a possible interaction with the wild fly's population.

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Landscape effects on the abundance and larval diet of the polyphagous pest Helicoverpa armigera in cotton fields in North Benin

Cited by 10 publications

References 58 publications

Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

Long-term expansion of cereal crops promotes regional population increase of polyphagous Helicoverpa armigera

Empirical evidence of the mediterranean fruit fly movement between orchard types

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