Cultivar Resistance against Colletotrichum asianum in the World Collection of Mango Germplasm in Southeastern Brazil

Abstract

During the spring of 2014, a wide survey was conducted in one of the most important mango (Mangifera indica) cultivating areas located in Minas Gerais State (Brazil) to ascertain the causal agent of severe anthracnose infections and to evaluate disease susceptibility within a world collection of mango germplasm. Overall, 86 cultivars were monitored and 152 fungal isolates recovered from infected samples were identified by morphological characterization, DNA sequencing and phylogenetic analyses. All isolates were identified as Colletotrichum asianum. Under natural disease pressure, it has been possible to ascertain a variable tolerance degree within the germplasm collection. By applying a categorized classification, cultivars were classified as follows: 10 highly sensitive (11.6%), 13 sensitive (15.1%), 18 moderately sensitive (20.9%), 23 moderately tolerant (26.7%), 11 tolerant (12.8%), and 11 highly tolerant (10.4%). The most susceptible cultivars to anthracnose were Ubà, Quinzenga, Amarelinha da Sementeira followed by Aroeira and Correjo, whereas Mallika followed by Ourinho and Lita resulted in the least susceptible cultivars. To the authors’ knowledge, this is the first large-scale evaluation of mango susceptibility to C. asianum infections within a wide number of cultivars. Anthracnose is a serious threat to mango production and assessment of cultivar response to disease could be useful in breeding programs.

Identification of New Sources of Resistance to Anthracnose Caused by Colletotrichum horii among Persimmon Germplasms

“…In the present study, the anthracnose pathogen can result in dark lesions in the fruit, calyx, branches, and leaf of persimmon, showing similar results with previous reports [9,15,22,30]. In addition, the C. gloeosporioides species complex consists of important plant pathogens that can cause anthracnose in economic crops, such as chili [31], mango [32], strawberry [33], apples [34], grapes [35], bananas [36,37], and tomato [38]. As a destructive disease of persimmon trees, C. horii can cause leaf defoliation, fruit rot, and even the death of the whole plant [39].…”

Morphological characterization and molecular identification of Colletotrichum species associated to sweet persimmon anthracnose in Southern Brazil

“…C. fructicola has been reported as a causal agent of fruit anthracnose in apple (VELHO et al 2015), grapes (ECHEVERRIGARAY et al, 2020), and other crop fruits in Brazil, and was first reported in persimmon in Parana State (Southern Brazil) by CARRARO et al (2019), and C. aenigma was previously associated to sweet persimmon anthracnose in Korea (HASSAN et al, 2018), and grape ripe-rot disease in Southern Brazil (ECHEVERRIGARAY et al, 2020). Moreover, C. asianum is associated with anthracnose in coffee (PRIHASTUTI et al, 2009) and mango (SHARMA et al, 2015, VITALE et al, 2020, but this is the first report of this species on persimmon.…”

Can Biological Control Agents Reduce Multiple Fungal Infections Causing Decline of Milkwort in Ornamental Nursery?

“…In the post-hoc analysis, the mean separation was conducted on all variables using post-hoc Fisher's least significant difference test at α = 0.05. Prior to analysis, percentage values were transformed as arcsine square root (sin −1 square root x) to improve homogeneity of variances [47].…”