Vanessa cardui of the sky, implying the use of a solar compass to orient its migratory direction and maintain a straight flight path. "V. cardui" displays a unique system of continuous mating, throughout all seasons, including the winter. This may be attributed to its migratory patterns, thus significantly affecting its mating behavior. During European migrations, the butterflies immediately begin to mate and lay eggs upon arrival in the Mediterranean in the spring, starting in late May. In the United States, painted lady butterflies migrating towards the north experience poor mating conditions, and many butterflies have limited breeding capabilities. The "local adult generation"
Brachycaudus cardui viral disease affecting plums, damsons, peaches, apricots and some other plants. Brachycaudus cardui Brachycaudus cardui is a species of aphid, commonly known as the thistle aphid or the plum-thistle aphid. It infests trees in the genus "Prunus" in the spring and autumn, and mostly plants in the aster family in the summer. The viviparous wingless females of "B. cardui" have an oval or pear-shaped body and grow to a length of from . The colour may be green, yellowish, reddish or brown. The abdomen has a dark, shining patch on the dorsal surface, a fact which distinguishes this species from