Thành phần sinh vật hại và hiệu lực của một số loại thuốc phòng chống sâu cuốn lá nhỏ (Cnaphalocrocis medinalis) và bệnh đạo ôn (Magnaporthe oryzae) trên giống lúa HT1 tại Thành phố Huế

Abstract

In Vietnam, rice (Oryza sativa L.) is the principal staple crop its productivity is increasingly constrained by pest and disease pressure, especially in high-quality cultivars. In Hue City, intensive pesticide application has been practiced for many years; however, the declining efficacy of several chemical products necessitates reassessment of current management strategies. Field experiments were conducted to identify major pests and to evaluate the control efficacy of selected insecticides and fungicides against the rice leaf folder (Cnaphalocrocis medinalis) and rice blast disease (Magnaporthe oryzae). Pest incidence and disease severity were monitored, and pesticide performance was quantified, including calculation of the area under the disease progress curve (AUDPC). A total of eight insect species, five pathogenic diseases, and two animal pests were recorded on HT1 rice, with the leaf folder and leaf blast being the most prevalent. At 7 days post-application, Bach Ho 150SC achieved the highest control efficacy against leaf folder (90.3%), Obaone 95WG (84.3%), while Bemab 3.8EC showed lower activity (78.5%). For rice blast, Salame 602WP exhibited the lowest AUDPC (27.39), Fuji-One 40EC (29.15), followed by FuNhat 40EC (32.60), whereas the untreated control reached 53.96. The findings highlighted the predominance of leaf folder and blast disease in HT1 rice production in Hue. Based on the experimental results, Bach Ho 150SC, Obaone 95WG, and Salame 602WP were found to be effective in controlling on rice leaf folder and rice blast disease on rice in Hue City, Vietnam.