옥수수 품종별 열대거세미나방의 기주 섭식 선호도 및 옥수수 품종별 성분 분석

초록

Fall armyworm (FAW; Spodoptera frugiperda) is a major pest worldwide. Since its first confirmed domestic invasion in 2019, damage to crops such as corn has been steadily increasing. To provide basic data for the management of S. frugiperda, we compared the species’ host preference and nutritional compositions of corn varieties. Twelve varieties of corn were selected for the experiment: three commercially available sweet corn varieties, two popcorn varieties, three varieties used for processing purposes, and three pigmented varieties (Saekso 1, Saekso 4, Saekso 5, Oryun 2, Daeryuk 2, Dreamok, Gangilok, Arichal, Heukgeom 2, Miheukchal, Oryun popcorn, and Mibaek 2). To determine differences in host preference between breeds and environments, preferences were investigated at the population and individual levels. The damage rate was significantly lower in Saekso 5 after 3 days, Arichal after 5 days, and Heukgeom 2 on day seven after treatment. The individual-level experiment confirmed that when leaves were tested, Gangilok had the highest damage rate and Oryun 2 had the lowest. Conversely, when stems were used, Saekso 1 had the highest and Dreamok had the lowest rates. The experimental results were inconsistent at the population and individual levels, and the broad range of variation made it difficult to select varieties that S. frugiperda avoided. However, Mibaek 2 had the highest damage rate at a significant level up to 5 days after treatment at the population level. After analyzing the general components of the 12 varieties, determining a relationship between the components and preferences between varieties was not straightforward. Among the corn varieties currently cultivated, there are no varieties that S. frugiperda avoids feeding on; therefore, it is believed that it will be challenging to use ecological control depending on the corn variety. Thus, other control methods, such as chemical control, appear more effective.

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