- Book Chapter
3
- 10.1079/9781789248715.0008
Management of Agricultural Soils to Support Ecosystem Services for Pest Control
- Mar 26, 2024
- Heikki Mt Hokkanen + 1 more +1
The role of agricultural soils in supporting entomopathogenic organisms for pest control is a significant yet understudied aspect of insect population regulation. Pest insects that enter the soil during specific life stages, or reside in it as larvae, often experience substantial mortality primarily attributed to entomopathogens and other factors. However, the extent of this mortality remains largely unknown, and the soil component has been frequently regarded as a ‘black box’ in the context of pest population dynamics. Currently, most agricultural fields lack this important component of insect population regulation, presenting an opportunity to utilize it for enhanced pest control in the ecostacking approach. By exploiting the potential of insect pest suppressive soils, enhanced biocontrol in the soil can complement the pest insect mortality caused by predators, parasitoids and various other factors that limit population size, such as competitors, plant secondary metabolites and induced resistance. Strategies such as supporting the recycling of entomopathogens, minimizing or abolishing the use of harmful agrochemicals, and adopting minimum tillage practices can play a pivotal role in ensuring their persistence. Growers can further support the survival and build-up of entomopathogens by establishing suitable intercrops or cover crops, particularly legumes, for crops that are unfavourable to soil-dwelling insects. Incorporating appropriate soil amendments, such as organic materials (composts, biochar or chitinous products), stimulating the activity and persistence of beneficial antagonistic organisms, along with the use of organic fertilizers, can contribute to promoting entomopathogen survival in the soil. However, further research is warranted to evaluate the long-term impacts of these techniques on soil suppressiveness towards specific pest problems across diverse crops and cropping systems. Additionally, it is essential to assess their effects on other potential pest and beneficial organisms, as well as determine the optimal combination of ecostacking tools for different ecological contexts.
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