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Archived Comments for: Cereal aphid movement: general principles and simulation modelling

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  1. Erratum

    Hazel Parry, CSIRO

    21 November 2014

    A couple of mistakes in the paper have come to my attention, apologies:

    1) Section ‘Host plant conditions’, third paragraph, first sentence:

    "Crowding may stimulate flight as jostling of aphids on the plants can pre-condition alates for flight take-off [33,46,85]."

    Reference 33 is a Walters et al reference but it is not the one about crowding.  I should refer here to Reference 83 (Walters KFA, Dixon AFG: The effect of host quality and crowding on the settling and take-off of cereal aphids). 

    2) Section 'Basic rules of appetitive flight', first paragraph, seventh sentence:

    The derivation of the maximum appetitive flight distance is incorrect (although the value of 200m still holds, see below).  The reference to 30-240 minutes should be removed (as this refers to migratory flight).  The primary reference I found for appetitive flight distance is Nemecek et al. [70], and in that paper they derive a Weibull function for the distribution of appetitive flight distances. This section of the paper should be altered and read as follows:

    In general, the flight speed of aphids is between 0.8-3.3kmh−1 [12]. This is in agreement with Compton [36] who states that the maximum flight speed of aphids is 0.9 ms−1 (3.24kmh−1). Individual appetitive flights will be much shorter than this, just a few metres [70] where aphids fly for only a few seconds up to around 5 minutes at a time, depending on the suitability of the habitat and aphid exhaustion [15]. The resultant maximum flight distance can be calculated by multiplying the flight speed of 0.9 ms−1  by 5 minutes, 270m (without wind assistance), which is comparable to the maximum distance of 200m for a single appetite flight during low wind conditions estimated by Nemecek et al. [70].

    Thanks go to Hugo Thierry for noticing the second of these errors when referencing this paper to construct a model (PhD Candidate, ENSAT Ecole Nationale Supérieure Agronomique de Toulouse/Dynafor INRA).

    Competing interests

    None declared