Host plants and their role in the ecology of the fruitspotting bugs Amblypelta nitida

An expanded host list is given for Amblypelta nitida (fruitspotting bug) and Amblypelta lutescens lutescens (banana-spotting bug) in Australia. These are compared with those extracted from the literature for Amblypelta cocophaga China, Amblypelta theobromae Brown, Amblypelta lutescens papuensis Brown, and Amblypelta brevicornis Brown. Despite many new additions to the list of known hosts for A. nitida and A. I. lutescens, Australian native plant species are relatively poorly represented. Rainforest species are thought to be important refugia and breeding hosts for the bugs since orchards located adjacent to such vegetation are often severely damaged. the broad host range of several Amblypelta spp. is discussed with respect to the bugs' pest status and the role of alternative hosts as breeding sites for fruitspotting bugs which migrate into commercial orchards

Intraspecific variation within Orosius argentatus Evans (Hemiptera: Cicadellidae): colour polymorphisms, morphometric analyses and host associations

Orosius argentatus shows extreme colour variation and is reputedly highly polyphagous, circumstances that both warrant confirmation that the taxon comprises only one species. Because the species transmits phytoplasma pathogens between plants, information on species status is relevant to epidemiological studies. Replicated field samples, taken in Mareeba, North Queensland, over 2 years indicated that O. argentatus is the most abundant leaf-hopper in stylo (Stylosanthes scabra) and is relatively host-specific on cultivated stylo, at least locally. A priori groupings of colour types were established for morphometric analyses of head, prothorax, tibia, wing and genitalia characters. No consistent morphological differences were detected across the colour types, and results from colour heritability trials, although limited, revealed that females could produce progeny that belong to multiple colour types. The results from this study suggest individuals that key out to the species O. argentatus, despite being polymorphic in colour, cannot be clearly separated on any morphological basis and therefore are likely to belong to a single, interbreeding population. The colour variation in adults is therefore a polymorphism