A new concept for insect damage evaluation based on plant physiological variables

Anais da Academia Brasileira de Ciências

Ademir D. Neves²  Ricardo F. Oliveira¹  José R.p. Parra² 

[1],Universidade de São Paulo Escola Superior de Agricultura 'Luiz de Queiroz' Departamento de EntomologiaPiracicaba SP ,Brasil

关键词: photosynthesis;    economic level injury;    citrus;    coffee;    plant-insect interactions;    fotossíntese;    nível de dano econômico;    citros;    café;    interações planta-inseto;   

DOI  :  10.1590/S0001-37652006000400015

来源: SciELO

【 摘 要 】

The objective of this study was to determine the damage levels caused by Orthezia praelonga Douglas, 1891 and Leucoptera coffeella (Guérin-Mèneville 1842), on rangpur lime and Obatã coffee leaves, respectively. Measurements were based on a new concept for the evaluation of the following plant physiological parameters: photosynthesis, stomatal conductance, leaf temperature and transpiration, and internal concentration of CO2 (by infrared analyzer). A negative correlation between infestation level and photosynthesis was found, where the negative inflexion point of the curve was considered as a reference for damage levels. The control level for O. praelonga is below the 7-13% limit for damaged leaf area (40 to 70 scales per leaf), while for L. coffeella it is below the 26-36% limit for the same variable. Photosynthesis provided the best correlation for this type of analysis.

【 授权许可】

CC BY   
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