Agar pengendalian hama ulat bawang dapat dilakukan secara tepat, maka harus dikenali terlebih dahulu morfologi/bioekologi, gejala serangan, tanaman inang, dan cara pengendaliannya. sayap depan ngengat berwarna coklat tua dengan garis-garis yang kurang tegas dan terdapat bintik-bintik hitam.
In order to control the onion caterpillar pest properly, it is necessary to first identify the morphology/bioecology, symptoms of attack, host plant, and how to control it. The forewings of the moth are dark brown with less defined lines and black spots. The hind wings are whitish with black stripes on the edges. The length of the wingspan is between 25-30 mm. Female moths start laying eggs at the age of 2-10 days. Eggs are round to elliptical. The eggs are laid in clusters on the surface of the leaves or stems and are covered by white hairs from the mother's body. Each group of eggs has a maximum of 80 eggs. The number of eggs produced by a female moth is about 500-600 eggs. After 2 days the eggs hatch into larvae. Adult moths are active, eat, mate and move at night, while during the day they rest at the base of the plant. Moths are very attracted to light. The larvae or young caterpillars are green with black stripes on their backs. While the color of old caterpillars varies, namely green, light brown, and brownish black. Caterpillars that live in the highlands are generally brown. The caterpillar stage consists of 5 instars (the length of the first instar is about 1.2 – 1.5 mm and the second to the last instar is between 1.5 – 19 mm). The caterpillar stays in the leaf cavity for 9-14 days and burrows the leaf. After the last instar the caterpillar crawls or drops to the ground to pupate. Caterpillars are more active at night. The larval stage lasts for 8-10 days. Pupae are light brown in color and 9 – 11 mm long, without pupae. Pupae are in the soil to a depth of 1 cm, and are often found on the base of the stem, protected under dry leaves, or under soil particles. Within 5 days, the pupa develops into a moth.
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