Conidial Discharge and Transmission Efficiency of Neozygites floridana, an Entomopathogenic Fungus Infecting Two-Spotted Spider Mites under Laboratory Conditions

Brown, G. C.; Hasibuan, Rosma

doi:10.1006/jipa.1995.1002

Cited by 43 publications

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“…, is of the same order of magnitude as reported recently by Brown and Hasibuan (1995) for N. floridana attacking the two-spotted spider mite T. urticae. They found eitherb 0.045 orb 0.024 cm 2 /day 7 1 depending on whether the linear regression was forced through the origin or not.…”

Section: Discussionsupporting

confidence: 85%

“…They found eitherb 0.045 orb 0.024 cm 2 /day 7 1 depending on whether the linear regression was forced through the origin or not. Brown and Hasibuan (1995) argued that the difference between the two regression slope estimates indicates non-linearity in the relation between the number of new infections and the product of S and C; the best fitting relation was close to a square-root function of S and C. Non-linearities did not show up when Brown and Hasibuan (1995) ) and the probability of successful infection after passing a halo (p mh ). In formula, this is…”

Section: Discussionmentioning

confidence: 99%

“…This form of the transmission term has been applied to the NeozygitesTetranychus model of Brown and Hasibuan (1995), which therefore assumes that the epidemic takes place in a homogeneously mixed population in an environment of fixed size. When the area occupied by the population increases with population size (as in spider mites), the total host density is constant within this area A, i.e.…”

Section: Model Descriptionmentioning

confidence: 99%

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Modelling Fungal (Neozygites cf. Floridana) Epizootics in Local Populations of Cassava Green Mites (Mononychellus Tanajoa)

et al. 1997

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ABSTRACTThe fungus, Neozygitis cf. floridana is parasitic on the cassava green mite, Mononychellus tanajoa (Bondar) (Acari: Tetranychidae) in South America and may be considered for classical biological control of cassava green mites in Africa, where cassava is an important subsistence crop, cassava green mites are an imported pest and specific natural enemies are lacking. Spider mites generally have a viscous structure of local populations, a trait that would normally hamper the spread of a fungus that is transmitted by the contact of susceptible hosts with the halo of capilliconidia surrounding an infectious host. However, if infected mites search and settle to produce capilliconidia on sites where they are surrounded by susceptible mites before becoming infectious, then the conditions for maximal transmission in a viscous host population are met. Because the ratio between spider mites and the leaf area they occupy is constant, parasite-induced host searching behaviour leads to a constant per capita transmission rate. Hence, the transmission rate only depends on the number of infectious hosts. These assumptions on parasite-induced host search and constant host density lead to a simple, analytically tractable model that can be used to estimate the maximal capacity of the fungus to decimate local populations of the cassava green mite. By estimating the parameters of this model (host density, per capita transmission rate and duration of infected and infectious state) it was shown that the fungal pathogen can reduce the population growth of M. tanajoa, but cannot drive local mite populations to extinction. Only when the initial ratio of infectious to susceptible mites exceeds unity or the effective growth rate of the mite population is sufficiently reduced by other factors than the fungus (e.g. lower food quality of the host plant, dislodgement and death by rain and wind and predation), will the fungal pathogen be capable of decimating the cassava green mite population. Under realistic field conditions, where all of these growth-reducing factors are likely to operate, there may well be room for effective control by the parasitic fungus. 0168-8162

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

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Modelling Fungal (Neozygites cf. Floridana) Epizootics in Local Populations of Cassava Green Mites (Mononychellus Tanajoa)

et al. 1997

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“…A nonlinear incidence rate also arises from saturation effects: if the proportion of the infective hosts in a population is very high, so that exposure to the disease agent is virtually certain, then the transmission rate may respond more slowly than linear to the increase in the number of infectives. This effect was observed, for example, by Capasso and Serio (1978) who studied the cholera epidemic spread in Bari in 1973, and by Brown and Hasibuan (1995) who studied infection of the two-spotted spider mites, Tetranychus urticae, with the entomopathogenic fungus, Neozygites floridana.…”

Section: Introductionmentioning

confidence: 88%

Lyapunov Functions and Global Stability for SIR and SIRS Epidemiological Models with Non-Linear Transmission

2006

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“…Saturation effects also lead to a nonlinear incidence E-mail address: andrei@nsc.es.hokudai.ac.jp. rate: If the portion of the infective hosts in a population is very high and exposure to the disease agent is virtually certain, then the transmission rate may grow more slowly than linear with the increase in the number of infectives. This effect was encountered in clinical observations as well as in laboratory experiments (Capasso and Serio, 1978;Brown and Hasibuan, 1995). Furthermore, the details of transmission of infectious diseases are generally unknown, and may vary for different conditions; this observation justifies the growing interest to the models with incidence rates of more general form.…”

Section: Introductionmentioning

confidence: 90%

Global Properties of Infectious Disease Models with Nonlinear Incidence

2007

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We consider global properties for the classical SIR, SIRS and SEIR models of infectious diseases, including the models with the vertical transmission, assuming that the horizontal transmission is governed by an unspecified function f(S,I). We construct Lyapunov functions which enable us to find biologically realistic conditions sufficient to ensure existence and uniqueness of a globally asymptotically stable equilibrium state. This state can be either endemic, or infection-free, depending on the value of the basic reproduction number

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Conidial Discharge and Transmission Efficiency of Neozygites floridana, an Entomopathogenic Fungus Infecting Two-Spotted Spider Mites under Laboratory Conditions

Cited by 43 publications

References 0 publications

Modelling Fungal (Neozygites cf. Floridana) Epizootics in Local Populations of Cassava Green Mites (Mononychellus Tanajoa)

Modelling Fungal (Neozygites cf. Floridana) Epizootics in Local Populations of Cassava Green Mites (Mononychellus Tanajoa)

Lyapunov Functions and Global Stability for SIR and SIRS Epidemiological Models with Non-Linear Transmission

Global Properties of Infectious Disease Models with Nonlinear Incidence

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