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Eggs are usually laid on bracts of the thistle heads at the bud stage in early spring (April/May). Some are also found on the stems during heavy infestation. The eggs are brown specks about 0.5 to 1 mm in diameter. This stage lasts for 6 days.
Larva: On hatching, the young larva feeds on the bracts and into the thistle head. Larvae complete their development within the thistle heads. Many can be found in a sin
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