Dynamic Economic Thresholds for Insecticide Applications Against Agricultural Pests: Importance of Pest and Natural Enemy Migration

Author:

Keasar Tamar1ORCID,Wajnberg Eric23ORCID,Heimpel George4,Hardy Ian C W5ORCID,Harpaz Liora Shaltiel6,Gottlieb Daphna7,van Nouhuys Saskya8ORCID

Affiliation:

1. Department of Biology and the Environment, University of Haifa – Oranim , Tivon 36006 , Israel

2. INRAE, 400 Route des Chappes, BP 167, Sophia Antipolis Cedex 06903 , France

3. INRIA Sophia Antipolis, Project Hephaistos, 2004 Route des Lucioles, BP 93 , Sophia Antipolis Cedex 06902 , France

4. Department of Entomology, University of Minnesota , 1980 Folwell Avenue, St. Paul, MN, 55117 , USA

5. Department of Agricultural Sciences, P.O. Box 27, FI-00014, University of Helsinki , Finland

6. Environmental Sciences Departments, Faculty of Sciences and Technology, Tel Hai College, and Northern R@D , 12210, MIGAL , Israel

7. Department of Food Science, Institute of Post-Harvest and Food Science, The Volcani Center, ARO , Rishon LeZion, 7528809 , Israel

8. Centre for Ecological Sciences, Indian Institute of Science , Bangalore, 560012 , India

Abstract

Abstract In Integrated Pest Management programs, insecticides are applied to agricultural crops when pest densities exceed a predetermined economic threshold. Under conditions of high natural enemy density, however, the economic threshold can be increased, allowing for fewer insecticide applications. These adjustments, called ‘dynamic thresholds’, allow farmers to exploit existing biological control interactions without economic loss. Further, the ability of natural enemies to disperse from, and subsequently immigrate into, insecticide-sprayed areas can affect their biological control potential. We develop a theoretical approach to incorporate both pest and natural enemy movement across field borders into dynamic thresholds and explore how these affect insecticide applications and farmer incomes. Our model follows a pest and its specialist natural enemy over one growing season. An insecticide that targets the pest also induces mortality of the natural enemy, both via direct toxicity and reduced resource pest densities. Pest and natural enemy populations recover after spraying through within-field reproduction and by immigration from neighboring unsprayed areas. The number of insecticide applications and per-season farmer revenues are calculated for economic thresholds that are either fixed (ignoring natural enemy densities) or dynamic (incorporating them). The model predicts that using dynamic thresholds always leads to reduced insecticide application. The benefit of dynamic thresholds in reducing insecticide use is highest when natural enemies rapidly recolonize sprayed areas, and when insecticide efficacy is low. We discuss real-life situations in which monitoring of natural enemies would substantially reduce insecticide use and other scenarios where the presence of beneficial organisms may lead to threshold modifications.

Publisher

Oxford University Press (OUP)

Subject

Insect Science,Ecology,General Medicine

Reference50 articles.

1. Spillover of functionally important organisms between managed and natural habitats;Blitzer;Agric. Ecosyst. Environ,2012

2. Simple models of natural enemy action and economic thresholds;Brown;Am. Entomol,1997

3. Neonicotinoids from coated seeds toxic for honeydew-feeding biological control agents;Calvo-Agudo;Environ. Pollut,2021

4. Experimental treatment threshold for the cotton aphid (Homoptera: Aphididae) using natural enemies in Arkansas cotton;Conway;J. Entomol. Sci,2006

5. Prediction of insect populations in grain storage;Driscoll;J. Stored Prod. Res,2000

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Planting Date of Cotton in the Brazilian Cerrado Drives Boll Weevil (Coleoptera: Curculionidae) Infestation;Insects;2023-07-02

2. Population Dynamics;Jervis's Insects as Natural Enemies: Practical Perspectives;2023

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3