Determination of fungal wilt pathogens in cotton fields of Hatay Reyhanli county, susceptibilities of commonly grown cotton cultivars to these pathogens and the effects of plant resistance inducing products on disease occurrence

Determination of fungal wilt pathogens in cotton fields of Hatay Reyhanli county, susceptibilities of commonly grown cotton cultivars to these pathogens and the effects of plant resistance inducing products on disease occurrence were investigated in this study. Efficacy of plant resistance inducing products (Aliette WG, Bion MX 44 WG, ISR-2000 and salicyclic acid) were tested on Flash cotton cultivar in greenhouse conditions. The average isolation rates of F. oxy. f.sp. vasinfectum and V. dahliae were calculated as 20.6% and 4.0% from Reyhanli cotton areas. Among the cotton cultivars BA525 showed minimum but Flash maximum susceptibility to F. oxy. f.sp. vasinfectum with 6.9% and 44.8% disease severity percentages. On the other hand, Carmen and Candia were determined as the least susceptible but PG2018 as the most susceptible cultivars to V. dahliae (with 10.7, 10.9 and 45.0% percentages respectively) in greenhouse conditions. Plant resistance inducing products had no effect on mycelial growth of both pathogens on PDA media in in vitro studies but they decreased Fusarium and Verticillium wilts with 20.0-66.3% efficacy rates in greenhouse conditions. While salicyclic acid was the most successful chemical for both disease, ISR-2000 followed it by around 50% efficacies.