Technical Abstract: Many hemipteran insects are important agricultural pests because they cause direct feeding damage to their host plants and/or because they transmit plant disease agents including viruses and bacteria. Microscopic and behavioral studies on five hemipteran species from four families (Psyllidae, Aphididae, Cicadellidae, and Aleyrodidae) showed that their exuviae normally had either fully or partially extended stylets in a feeding-like position. In most cases these stylets were still partially embedded in their host plants after ecdysis, which indicated that plant-feeding hemipteran nymphs use their stylets to anchor themselves to host plants during molting. This phenomenon was used here to study the stylet length and ultrastructure in various instars, which is normally more difficult in nymphs than in adults because of the fragility and smaller size of nymphs. Additionally, autofluorescence was used for studying the hemipteran salivary sheaths of nymphs and adults in their host plants. This method is based on fixation of free hand sections of the plant parts on which hemipteran insects have been feeding, then mounting and examination of these sections with epifluorescence or confocal microscopy. No embedding, microtomy or staining is necessary for this method which makes it much faster and simpler than other methods. Autofluorescence was also used to study the location and size of bacteriomes/ mycetomes (organs containing symbiotes) in hemipteran eggs and nymphs. The above methods were applied successfully with the Asian citrus psyllid (Diaphorina citri), melaleuca psyllid (Boreioglycaspis melaleucae), oleander aphid (Aphis nerii), the whitefly Bemisia tabaci, and the glassy-winged sharpshooter leafhopper (Homalodisca vitripennis).