cabbage aphid, brevicoryne brassicae

aphid aphididae aphids background blackfly brassicae brevicoryne cabbage collection colony control cycle damage destructive development dusty entomology environment fauna female garden generation gray greenfly hemiptera hemipteran immature insects isolated leaf lice life macro mature natural nymph oviparous parasite parthenogenesis pest plant reproduction secretion small stalk sucking viviparous wax waxy white whitefly