Journal of Taiwan Agricultural Research

Author:Hung-I Liu, Shou-Huang Huang*, and Kuo-Szu Chiang**

Abstract:

    Rice leaf folder [Cnaphalocrocis medinalis (Guenée)] is one of the major pests of rice. Injury to flag leaf caused by rice leaf folder larva will reduce the efficiency of photosynthesis process, thereby leading to serious yield loss. Traditionally, the damaged leaf area of rice leaf folder has been measured using manual approach. However, the traditional method takes relatively more time and manpower. In this study, the image analysis via ASSESS 2.0 was used to measure the damaged leaf area. The result showed that measurement and analysis of image was highly consistent with that of the manual approach, which is regarded as the gold standard (ρ_c higher than 0.983). Moreover, the variance analysis showed that the two methods had no significant difference. In addition, the image analysis can reduce at least 29% measurement time. Thus, image analysis can be recommended as a tool for the damaged leaf area measurement infested with rice leaf folder.

Key words:Rice, Oryza sativa L., Rice leaf folder, Cnaphalocrocis medinalis (Guenée), Measurement, Image analysis

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