Control ofSclerotinia sclerotioruminfection in oilseed rape with strobilurin fungicide SYP-7017

Abstract

SYP-7017, a broad-spectrum fungicide, belongs to the chemical group of strobilurins. Baseline sensitivity of Sclerotinia sclerotiorum (Lib) de Bary to SYP-7017 was determined using 120 strains collected during 2010 and 2011 from rapeseed fields without a previous history of strobilurin usage in Jiangsu Province, China. The median effective concentration (EC 50 ) values for SYP-7017 that inhibited mycelial growth ranged from 0.006 to 0.047 µg mL −1 (mean of 0.016 µg mL −1 ). No cross-resistance between SYP-7017 and carbendazim or iprodione was detected. On detached rapeseed leaves, SYP-7017 at 100 µg mL −1 provided over 90% control efficacy. Moreover, SYP-7017 exhibited good characteristics of absorption and translocation, and also exhibited excellent protective activity in pot experiments. In field trials, control efficacies of SYP-7017 at 75 g a.i. ha −1 and 187.5 g a.i. ha −1 were 80.2% and 91.58%, respectively, higher than other traditional fungicides. These results suggest that SYP-7017 has strong antifungal activity and a potential application in controlling S. sclerotiorum.Résumé: Le SYP-7017, un fongicide à large spectre, appartient au groupe des strobilurines. La réceptivité de base de Sclerotinia sclerotiorum (Lib.) de Bary au SYP-7017 a été déterminée à l'aide de 120 souches collectées en 2010 et 2011 dans des champs de colza de la province du Jiangsu, en Chine, dans lesquels les strobilurines n'avaient jamais été utilisées. Les valeurs de la concentration létale médiane (CL 50 ) du SYP-7017 qui inhibaient la croissance mycélienne variaient de 0.006 à 0.047 µg mL −1 (moyenne de 0,016 µg mL −1 ). Aucune résistance croisée entre le SYP-7017 et le carbendazime ou l'iprodione n'a été détectée. Sur des feuilles détachées de colza, le SYP-7017, utilisé à une concentration de 100 µg mL −1 , a affiché un taux d'efficacité de plus de 90%. En outre, le SYP-7017 a présenté de bonnes caractéristiques d'absorption et de translocation, et ce, en plus d'assurer une excellente protection au cours d'expériences en pots. Au cours d'essais en champ, le taux d'efficacité du SYP-7017 à 75 g i. a. ha −1 et 187,5 g i. a. ha −1 était de 80.2% et de 91.58 %, respectivement, ce qui est plus élevé que ce qu'offrent les autres fongicides traditionnels. Ces résultats suggèrent que le SYP-7017 possède une puissante action antifongique et une capacité à maîtriser S. sclerotiorum.

The G143A/S substitution of mitochondrially encoded cytochrome b (Cytb) in Magnaporthe oryzae confers resistance to quinone outside inhibitors

“…QoI fungicides have shown perfect control efficacy in many crops and exhibit a broad antifungal spectrum due to their excellent fungicidal effect. [32][33][34][35] However, as a group of fungicides with a single action site, it is much easier to develop QoI-resistant mutants in the laboratory and field. Picoxystrobin, a QoI fungicide, C.…”

“…QoI fungicides, the most successful chemicals in the world, inhibit energy synthesis in plant pathogens by blocking the transfer of electrons in the quinone “outside” site of mitochondria complex III in the electron transport chain. QoI fungicides have shown perfect control efficacy in many crops and exhibit a broad antifungal spectrum due to their excellent fungicidal effect 32–35 . However, as a group of fungicides with a single action site, it is much easier to develop QoI‐resistant mutants in the laboratory and field.…”

Characterization of Sclerotinia sclerotiorum, an Emerging Fungal Pathogen Causing Blight in Hyacinth Bean (Lablab purpureus)

“…The fungicidal potentials of carbendazim, mancozeb and iprodione were reported against S. sclerotiorum in previous studies ( Mueller et al . , 2004 ; Singh et al, 2014 ; Wang et al, 2014 ). Similarly, Wilson et al (2005) reported that Ca in the form of Ca(OH) 2 inhibited S. minor ’s sclerotial germination and infection at the collar region of lettuce plants.…”

Antifungal Activity and Biochemical Response of Cuminic Acid against Phytophthora capsici Leonian

“…Moreover, isolates resistant to strobilurin fungicides have been reported in several important fungi, such as Alternaria alternata , Pseudoperonospora cubensis , and Blumeria graminis f.sp. tritici [19,20,21,22]. Owing to advantages in environment and health safety, and to minimize the risk of resistance development, many antifungal agents from plant extracts have been studied, such as limonoids from Khaya ivorensis A Chev [23], 1,2-Dihydro-6α-acetoxyazadirone from the fruit of Chisochton paniculatus (Roxb.)…”