Eggs are 0.8 mm long, white and flask shaped. Mullein bugs develop through five nymphal instars to adults. Nymphs are 0.5-2.5 mm long, yellow, with a pointed head and red eyes. There are several similar insects such as aphids and leafhoppers that can be confused with mullein bug nymphs. Major features to differentiate these species are illustrated in Figure 4-73. Adults mullein bugs are 3 mm long, oval and light green to tan in colour. Antennae are segmented and hind legs have black spots and are spine covered.
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