Ramularia areola sporulation potential in Brazilian cotton

Abstract

Ramularia blight, caused by Ramularia areola, is one of the most important diseases affecting cotton crop in Brazil. For its effective control, 5-9 fungicide applications on susceptible cultivars are necessary. The aim of the present study was to evaluate, in vitro and in vivo, the sporulation potential of R. areolaisolates from different Brazilian regions at distinct temperatures. Spore production was assessed in the laboratory and under green house conditions by using leaves from plants of eight cotton cultivars. The in vitro results indicated that the potential of spore production was dependent on temperature. Maximum sporulation of the fungus occurred at 17°C for isolates from São Paulo State and 23°C for isolates from Goiás and Mato Grosso States. In the in vivo study, there was a variation in spore production according to the cultivar and the isolate. Most isolates showed to be highly aggressive on cultivars FM966 LL and DELTAOPAL. The obtained results suggest a more rational use of fungicides and cultivars with decreased fungal sporulation and can form the basis for further studies of the pathogenic variability of this fungus in cotton crops in Brazil. This is the first report on the sporulation potential of Brazilian R. areola isolates.

Encrypted Antimicrobial Peptides from Plant Proteins

“…IAPs were also able to inhibit the cotton pathogen Ramularia areola 29 growth in vitro (Table 4 ). The IAPs Gr01 and Gr02, prospected from G .…”

<i>Mycosphaerella areola</i>—The Teleomorph of <i>Ramularia areola</i> of Cotton in Brazil, and Its Epidemiological Significance

“…Allied with pathological and molecular studies, aerobiological survey would be helpful to reveal the presence of ascospores during the cotton free period as well as during the sowing period of cotton [10]. The lack of presence of conidia of R. areola in the air during the initial stages of cotton crop for example, would indicate that the ascospores are solely responsible for the primary infection of the disease in the field.…”

Identification of Ramularia Leaf Blight Cotton Disease Infection Levels by Multispectral, Multiscale UAV Imagery

“…as an etiologic agent and is the most important foliar cotton disease. In Central-west Brazil, yield losses of~20-30% have been reported, which can exceed 70% without control measures in other production regions such as India [25]. Infection can cause boll abortion, malformation of bolls, and lower fiber quality.…”

“…Initially considered only a secondary phytosanitary problem and occurring only at the final stages of the production cycle, highly productive cotton cultivars are now affected as well in initial stages. In conjunction with a possible increasing resistance against fungicides [40], an effective corrective measure can demand up to ten repetitive applications [25], requiring the detection and mapping of ramularia blight imperative as early as possible.…”