Abstract
Damage situation of the cabbage webworm (Hellula undalis) on green mustards at Mekong Delta had been studied by farmer interview and field investigation at Vinh Long, Can Tho and Hau Giang province from February 2016 to March 2017. The results of interview with 180 households showed that H. undalis damaged 9 green mustards cultivars (Brassicaceae) which farmers are cultivating, especially heavy at the stage 10-15 DAP (days after planting) and in dry season heavily. Up to 48.9% of total interviewed households did less known about H. undalis, 17.2% not know and 33.9% know clearly the morphological characteristics, times and seasons it damaged. In 25 field investigation, the damage of H. undalis was popularity (++, 25-50%) with the frequency 5/5 times of green mustards season. Brassica campestris, Nasturtium officinale, B. juncea and B. integrifolia were damaged by H. undalis with the highest percentage of 7 green mustards cultivars.
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