The control of cabbage caterpillars should seize the period when there are not many insects in the initial stage, and control the occurrence and development to the maximum extent. It is necessary to pay close attention to the observation of their population dynamics. Generally, there are more than 5 insects in 100 leaves of cabbage seedlings, 15 insects in 100 seedlings (6-8 leaves), and more than 100 plants in the seedling stage (10-24 leaves). There are more than 50 insects, and more than 200 insects in more than 100 plants in the maturing stage (more than 24 leaves). There are 5 instars of cabbage caterpillars, and they should seize drugs when they are mainly 1-3 instar larvae. Cabbage caterpillars feed twice daily, peaking at approximately 9:00 in the morning and around 4:00 in the afternoon. At this time, the larvae are active on the leaf surface, and the sprayed medicaments are easily contacted.
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