drying of the rice plant is probably caused by biotic agent or a plant pathogenic fungus

Andoy regularly visits his rice field each morning to see if the plants are growing healthy with profuse tillers. He likewise patiently sees if the irrigation is timely set for each paddy to have sufficient water to sustain the growth. As he continues going around places, he noticed some plants that exhibit drying up of tillers, particularly the sheaths, extending up to the leaves. These plants are situated on paddies near the source of irrigation water and scattered within each plot. He is quite alarmed by the condition thereby pulling out few affected plants and he thought of bringing it to Luis, an extension personnel in their municipality. Luckily Luis is around to help him diagnose such abnormality. He interviewed Andoy regarding the environmental conditions and recent cultural practice(s) applied to the plots such as fertilization, application of pesticides, among others. Luis feels that knowing these may help him trim down the possibilities whether the drying may be associated with such practices or may be due to certain plant pathogen and henceforth leads him to a conclusion. If you are to help Luis perform the diagnosis, and you feel that such drying of the rice plant is probably caused by biotic agent or a plant pathogenic fungus, how would you lead him to make such conclusion or even give the identity of the disease? identify the disease

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