بررسی کارایی قارچکش لیانگدی (فناماکریل) 25% SC در کنترل بیماری فوزاریومی سنبله گندم از طریق محلول‌پاشی

Fusarium head blight (FHB) of wheat, caused by Fusarium graminearum Schwabe as a major species, has become one of the most important crop diseases in small-grain cereal production. The FHB pathogen lowers grain yield and quality, and under favorable conditions it can produce mycotoxins that poses a serious risk to animal and human health. In field condition, experiments were conducted based on randomized complete blocks design with 9 treatments and four replications in two locations including Mazandaran (Qarakhil & Baye-Kola) and Ardabil (Moghan) provinces to study on the efficacy of Liangdi (Phenamacril) 250 SC fungicide for controlling FHB. Treatments were included as: Liangdi 250 SC, at 1.5, 2, 2.5 & 3 l/h dosages, Alto-Combi 420 SC 0.5 l/h, Falcon 460 EC 0.8 l/h, Rex Duo 418 SC 0.5 l/h, Tilt 250 EC 1 l/h and check (untreated). The fungicides were sprayed at anthesis stage of wheat. The plots were visited at dough stage and disease incidence and severity were measured as well as grain yield and 1000 kernel weight of wheat determined for each treatment. The means of number of infected spikes and spikelet of wheat and grain yield and 1000 kernel weight were compared using Duncan's multiple range tests. Results indicated that in Qarakhil & Baye-Kola areas, Liangdi at 3 l/h, Falcon 0.8 l/h and Rex Duo 0.5 l/h were the most effective treatments in reducing the disease incidence and FHB index in comparison to the check. In relation to the effect of treatments on yield in Qarakhil & Baye-Kola areas, Liangdi at 3 l/h had effective on the increasing yield and 1000 kernel weight of wheat. In Moghan area, the disease incidence and severity were trace level. In conclusion, based on the results achieved in present study, Liangdi 250 SC at 3 l/h is recommendable for control of FHB in rotation with other register fungicides in country.