Abstract
Bacterial leaf blight is an important disease in Eucalyptus spp. plantations since it can cause defoliation, affecting plant development. A better understanding of the disease epidemiology is important for its control. Thus, the aim of this study was to analyze bacterial leaf blight temporal progress in the initial establishment in the field of different eucalyptus clones. It also targeted to correlate the incidence and area under the disease-progress curve (AUDPC), with variables related to growth and meteorological data. Bacterial leaf blight progress curves were analyzed based on incidence and carried out AUDPC calculation. Pearson’s coefficient was used to verify the correlations between bacterial leaf blight incidence and AUDPC with clone initial growth and meteorological factors. Gompertz or Logistic models were the best adjustment to data, according to the assessed clones. A difference in AUDPC was observed between clones regarding bacterial leaf blight incidence during the assessment period. Clones were divided into three groups with different tolerance levels. A negative correlation was observed between bacterial leaf blight incidence, AUDPC, and growth variables of clones. During the assessment period, average air temperature, rainfall, and air relative humidity favored disease incidence. The clones A469, VM01, and 373 were the most tolerant to the disease.
Highlights
Eucalyptus production has a prominent position in the Brazilian forestry sector due to its adaptability, rapid growth, and productivity
This study was conducted in Jamp Florestal company, Farm Desafio I, located at the geographical coordinates 10◦ 140 88” S and 47◦ 90 89” W, city of Novo Acordo-TO, Brazil, between February and August 2014, totaling 210 days after planting eucalyptus seedlings
Gompertz was the best adjustment for the studied pathosystem for clones A469, VM01, 373, VE41, 05, and 1253
Summary
Eucalyptus production has a prominent position in the Brazilian forestry sector due to its adaptability, rapid growth, and productivity. Eucalyptus plantations occupy 5.7 million hectares in the country, representing about 72% of the total area of planted trees for industrial purposes in Brazil. Eucalyptus plantations have undergone rapid expansion toward the northern and north-eastern regions of the country [1]. Edaphoclimatic conditions in these regions, such as temperature, air humidity, radiation, and rainfall, provide a favorable environment for the emergence of fungal and bacterial diseases [2]. Among the diseases affecting eucalyptus is bacterial leaf blight. Different bacterial species have been associated with bacterial leaf blight in several countries [3]
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