Guava fruit loss caused by rust

Summa Phytopathologica

Marlon Vagner Valentim Martins²  Silvado Felipe Da Silveira¹  Luiz Antônio Maffia¹ 

[1] ,Embrapa Agroindústria Tropical Laboratório de Fitopatologia Fortaleza CE

关键词: Psidium guajava;    Myrtaceae;    Puccinia psidii;    Psidium guajava;    Myrtaceae;    Puccinia psidii;   

DOI  :  10.1590/0100-5405/1904

来源: SciELO

【 摘 要 】

The aim of this paper was to estimate the loss caused by rust (Puccinia psidii) to 'Paluma' guava production in orchards located in Rio de Janeiro State. The disease intensity on the reproductive organs of plants was observed during two chemical control experiments carried out in 2003 and 2004. The loss was estimated based on simple linear regression and the production reduction (fruit number and weight ha-1) on the incidence of diseased buds and fruits. In the first experiment, no relationship was established between incidence of diseased buds and loss since there was a delay in spraying and the incidence of buds showing rust was high (mean of 47%) at the beginning of flowering. In the second experiment (2003-2004), spraying occurred at the beginning of the epidemics and there was a linear relationship between incidence of diseased buds and loss, justifying fungicide intervention at this stage. For the fruiting stage, a significant relationship was found between incidence of diseased fruits and loss in both experiments. In the absence of chemical control, rust reduced fruit production by around 90%.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License