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Role as pests

The crops most susceptible to P. brassicae damage in areas in Europe are those in the genus Brassica (cabbage, mustard, and their allies), particularly Brussels sprouts, cabbage, cauliflower, kohlrabi, rape, swede, and turnip. The attacks to crops are rather localized and can lead to 100% crop loss in a certain area. In addition, because of its strong inclination to migrate, adults may infest new areas that were previously free from attack. Because many of the host plants of P. brassicae are sold for consumption, damage by these butterflies can cause a great reduction of crop value. Larvae may also bore into the vegetable heads of cabbage and cauliflower and cause damage. High populations of these larvae may also skeletonise their host plants. In present-day areas such as Great Britain, P. brassicae are now less threatening as pests because of natural and chemical control reasons. However, it is still considered a pest in other European countries, in China, India, Nepal, and Russia. In fact, it is estimated to cause over 40% yield loss annually on different crop vegetables in India and Turkey.