Abstract
Wheat blast, caused by the fungus Magnaporthe oryzae pathotype Triticum (MoT), constitutes one of the major obstacles to the expansion of wheat production in Bangladesh. In the absence of resistant variety, fungicide control is the first-hand effort. Determining an effective and economic fungicide spray schedule in controlling blast disease of wheat was aimed. Ten fungicides were tested during two consecutive cropping seasons of 2018-2019 to 2019-2020. The wheat plants of blast susceptible cultivar BARI Gom 26 were inoculated with spores (107 spores ml-1) of MoT at pre-heading stage of wheat (52 days age). Fungicides were applied both before inoculation and after the appearance of blast symptoms in cocktail for three times starting from booting of wheat at 7 days interval. Plants received the combination of Filia (Tricyclazole 40% + Propiconazole 12.5%) and Seltima (Pyraclostrobin 10%) had significantly lower blast incidence and severity (1.23% and 3.33%) against untreated plants. Cocktail of Nativo and Trooper (Tricyclazole 75 wp) proved 2nd best curative measure. Application of Nativo (Tebuconazole 50% + Trifloxystrobin 25%) alone ranked third in its efficacy. The fungicide spray schedule covered booting, pre-heading and heading stages of wheat. The results indicate a mixture of Tebuconazole + Tricyclazole + Pyraclostrobin is more effective (97% blast reduction) and economic (BCR 1.45) than a single compound application in reducing incidence and severity of wheat blast.
 Int. J. Agril. Res. Innov. Tech. 11(1): 10-16, June 2021
Highlights
Wheat is the second most important staple food crop in Bangladesh after rice (Karim et al, 2010)
In 2016, the devastating wheat-blast disease caused by the fungus Magnaporthe oryzae pathotype Triticum (MoT) was reported in Bangladesh (Callaway, 2016)
Most of the commercially grown wheat cultivars in South Asia are susceptible to wheat blast, BARI Gom 33 released as blast resistant variety is in farmer’s field (Hossain et al, 2019)
Summary
Wheat is the second most important staple food crop in Bangladesh after rice (Karim et al, 2010). The highest yield losses happen when head infections start during anthesis or early grain development stages. The level of yield losses and speed of epidemics caused by MoT along with the lack of resistance may require innovative approaches to manage this disease. Chemical fungicides spray remains the main approach for controlling wheat blast until a dependable resistant cultivar is developed. Kabir et al (2021) Determining effective and economic fungicide spray schedule for blast of wheat. Other important side is that these fungicides acted well when applied before the appearance of blast disease as preventive measure, not providing curative action once the spike started bleaching. The present study was designed for finding out fungicide(s) and an effective spray schedule as both preventive and curative measures against incidence and severity of wheat blast
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