Population Study of Diabrotica speciosa (Ger.) (Coleoptera: Chrysomelidae) in Fall / Winter Season

Ventura, Maurício Ursi; Gomes, Marcos Roberto

doi:10.1590/s0103-84782004000600042

Cited by 5 publications

(3 citation statements)

References 10 publications

(9 reference statements)

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“…The adoption of a corn fallow area caused a reduction in the number of insects, as expected, since corn is a potential host for adult beetles, although not their preferred host [2,25]. This is the first study to model this issue, considering the foraging behaviour of D. speciosa, and indicated the efficiency of fallow areas in maintaining low densities of this pest.…”

Section: Landscape Scenariosupporting

confidence: 59%

Modelling movement and stage-specific habitat preferences of a polyphagous insect pest

et al. 2020

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Background: The feeding preferences of Diabrotica speciosa (Coleoptera: Chrysomelidae) cause a parent-offspring conflict, as providing the best host for the offspring development is detrimental to adult survival and fecundity. Understanding the implications of this conflict could help entomologists to implement pest-management programs. With this in mind, the foraging behaviour of D. speciosa was investigated using an individual-based model in two distinct scenarios. Methods: In an intercropping scenario, parent-offspring conflict was simulated when adult insects exploit two crops (corn and soybean) that provide different nutritional advantages for each insect stage. First, we compared three hypothetical types of adult dispersal, considering a continuous oviposition over time: diffusion, attracted to a fixed host and alternating the preference between hosts with frequency 1 τ , where τ is the time in days spent foraging for each host. We also simulated two principles: "mother knows best" (adult females foraging for corn during the oviposition period) and "optimal bad motherhood" (adult females remain foraging for soybean to maximise their own fitness during the oviposition period), but considering the existence of a pre-oviposition period. In a landscape scenario, we investigated the population dynamics in an area composed by 4 crop plots that change over time. Results: Among dispersal types considering continuous oviposition, the crop-alternating movement a-3 performed best, when close to an optimal τ. Additionally, τ was predicted to be influenced mainly by the width of crop rows. We also verified that the "mother knows best" strategy is better for the population growth than the "optimal bad motherhood". In the landscape scenario, we observed that including fallow periods in the crop calendar and adopting a more-heterogeneous arrangement of crop plots reduced the density of this insect. Conclusion: Both the continuous and sequential oviposition simulations indicate that foraging involving switching of target crop benefits population fitness. In the landscape scenario, arranging crop plots more heterogeneously and avoiding vast areas of soybean can help farmers to control this insect pest. Additionally, fallow periods can also reduce significantly D. speciosa populations.

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Section: Landscape Scenariosupporting

confidence: 59%

Modelling movement and stage-specific habitat preferences of a polyphagous insect pest

et al. 2020

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“…In Brazil, the occurrence of D. speciosa is widely reported in many different crops (Zucchi et al 1993). In maize fields, Ventura and Gomes (2004) associated the population growth of this pest with the expansion of cultivated areas during the dry season. Corn rootworm larvae feed on the root of the plants and cause death of newly germinated plants and/or deformation of developing plants (Pinto et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Maize-Dwelling insects omnivory in Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) egg masses

Menezes-Netto

Varella

2012

Braz. arch. biol. technol.

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“…In addition, this author observed that the immatures of D. speciosa have better performance when fed with corn roots that provide higher survival and weight gain. Ventura and Gomes (2004) evaluating the population of larvae of D. speciosa in fields with corn, wheat or oat, observed that the highest peak of larvae was verified in corn. Krysar (1981) argues that corn is a preferential host plant of D. speciosa due the relations of co-evolution of the insects and plants.…”

Section: Discussionmentioning

confidence: 99%

Biology, Reproductive Capacity, and Foliar Consumption of Diabrotica speciosa (Germar) (Coleoptera: Chrysomelidae) in Different Host Plants

Ávila¹,

Bitencourt²,

Silva³

2019

JAS

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Diabrotica speciosa is considered one of the most important agricultural pests in Latin America. Attacks various plant species including fructiferous, vegetable, cucurbit, dicotyledonous, and gramineous crops. The goal of this work was to evaluate the influence of different host plants, offered during the larval and adult stages of D. speciosa on their development, reproductive capacity, and foliar consumption. The insects were reared with corn in the larval stage and offered common bean, corn, soybean, forage turnip and wheat in the adult phase. In another essay, the larvae were reared with bean, soybean, forage turnip, corn, wheat, potato and adult stage offered only leaves of common beans to the insects. The insects reared with corn and fed on common bean leaves in the adult phase produced bigger numbers of eggs in contrast to the insects fed on other host plants. The longevity of adult specimens and the oviposition period were greater when adults of D. speciosa were fed on soybean, forage turnip, and common bean leaves, but these parameters were reduced in the insects fed on corn and wheat leaves. The viability of D. speciosa during the immature stage was greater when the larvae were fed with potato tubers or corn seedlings. However, the larvae reared on potato tubers exhibited a longer development period in contrast to larvae fed on other plants. In the foliar consumption tests, common bean leaves were preferred by adult of D. speciosa in contrast to other plants (soybean, corn and forage turnip) offered under free-choice conditions. On the other hand, in confinement conditions, common bean was preferred by insects when compared to turnip or corn leaves. The results showed that corn was the best food for the larval development of D. speciosa while common bean represented the most suitable host for the adults.

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Population Study of Diabrotica speciosa (Ger.) (Coleoptera: Chrysomelidae) in Fall / Winter Season

Cited by 5 publications

References 10 publications

Modelling movement and stage-specific habitat preferences of a polyphagous insect pest

Modelling movement and stage-specific habitat preferences of a polyphagous insect pest

Maize-Dwelling insects omnivory in Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) egg masses

Biology, Reproductive Capacity, and Foliar Consumption of Diabrotica speciosa (Germar) (Coleoptera: Chrysomelidae) in Different Host Plants

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