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Effects of vector maturation time on the dynamics of cassava mosaic disease

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posted on 2023-06-10, 00:45 authored by F Al Basir, Yuliya KyrychkoYuliya Kyrychko, Konstantin BlyussKonstantin Blyuss, S Ray
Many plant diseases are caused by plant viruses that are often transmitted to plants by vectors. For instance, the cassava mosaic disease, which is spread by whiteflies, has a significant negative effect on plant growth and development. Since only mature whiteflies can contribute to the spread of the cassava mosaic virus, and the maturation time is non-negligible compared to whitefly lifetime, it is important to consider the effects this maturation time can have on the dynamics. In this paper, we propose a mathematical model for dynamics of cassava mosaic disease that includes immature and mature vectors and explicitly includes a time delay representing vector maturation time. A special feature of our plant epidemic model is that vector recruitment is negatively related to the delayed ratio between vector density and plant density. We identify conditions of biological feasibility and stability of different steady states in terms of system parameters and the time delay. Numerical stability analyses and simulations are performed to explore the role of various parameters, and to illustrate the behaviour of the model in different dynamical regimes. We show that the maturation delay may stabilise epidemiological dynamics that would otherwise be cyclic.

History

Publication status

  • Published

File Version

  • Published version

Journal

Bulletin of Mathematical Biology

ISSN

0092-8240

Publisher

Springer

Issue

8

Volume

83

Page range

1-21

Article number

a87

Event location

United States

Department affiliated with

  • Mathematics Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-08-26

First Open Access (FOA) Date

2021-08-26

First Compliant Deposit (FCD) Date

2021-08-26

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