Phytophagous insects and natural enemies in kale under organic and chemical fertilizers

Cividanes, Francisco Jorge; Silva, Karen Pereira da; Martins, Ivan Carlos Fernandes; Santos-Cividanes, Terezinha Monteiro dos

doi:10.1590/1808-1657000902018

Cited by 1 publication

(2 citation statements)

References 18 publications

(17 reference statements)

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“…An understanding of how drought may interact with other abiotic factors, such as the type or amount of fertiliser supplied to crops, would help to inform growers of the increased risks from pests which may occur under future climate change, and potentially to plan adaptation such as increased irrigation or use of more drought resistant varieties, in combination with different fertiliser types. However, to date the majority of studies testing the responses of pest species and their natural enemies to drought and the type of fertiliser supplied to their host plants have looked at each abiotic factor separately (Cividanes, Silva, Martins, & Cividanes, 2020; Stafford et al, 2012; Staley et al, 2011b; Tariq, Rossiter, Wright, & Staley, 2013b). Assessments of whether the two factors may interact to alter pest and natural enemy performance or behaviour are rare, although Griffith and Grinath (2018) tested the interacting effects of drought and conventional fertiliser on a tobacco system.…”

Section: Introductionmentioning

confidence: 99%

“…Both of these aphid species have previously responded to drought stress and the type of fertiliser supplied to their host plants. For example, Cividanes et al (2020) found populations of both aphid species were greater on kale grown in conventional fertiliser, compared with two organic fertilisers. The performance of both species increased on B. oleracea var.…”

Section: Introductionmentioning

confidence: 99%

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The effects of drought stress and type of fertiliser on generalist and specialist herbivores and their natural enemies

Shehzad

Gulzar

Staley

et al. 2020

Annals of Applied Biology

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Abiotic stresses such as drought and nutrient availability can affect invertebrate herbivores feeding on plants, and potentially cascade up to impact their predators and parasitoids. Although these two factors separately been the subject of many studies, there are few tests of their combined effects in the context of pest species and their natural enemies on cultivated plants. Climate change models predict an increase in the frequency and severity of droughts, while the type and amount of fertiliser applied to crops is more under the control of growers. Understanding how these two abiotic factors may interact is key to utilising the potential of natural enemies to control pests under a future climate. To address this, a range of drought and fertiliser type treatments were applied to a model Brassica system in a factorial design, and the performance of two ubiquitous aphid species and their parasitoids was assessed. One aphid species was a specialist on Brassicas (Brevicoryne brassicae, with parasitoid Diaeretiella rapae) and the second a generalist aphid species (Myzus persicae, with parasitoid Aphidius colemani). The performance of both aphid species responded in a similar way to the treatments, and was maximised on plants growing in organic fertilisers under medium levels of drought stress. The strongest effects of drought and fertiliser cascaded up to affect parasitoids. Parasitoid performance responded in a broadly similar way to their aphid host performance in relation to fertiliser type. Some of the smaller effects of fertiliser treatments on aphid performance were not found for parasitoid performance. Aphid performance was greatest on plants under medium drought stress, but the parasitoids only responded consistently to the high drought stress treatment, on which their performance was reduced. Interactions between the drought and fertiliser did not have a large effect on aphid or parasitoid performance, compared with the strong main effects found for each treatment. These results are discussed in the context of previous and future research on the impacts of abiotic stresses on invertebrate herbivores and their natural enemies.

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