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Annals of Botany 78: 45-48, 1996
© 1996 Annals of Botany Company

Parasitic Relationships between a Gall-forming Insect Tomoplagia rudolphi (Diptera: Tephritidae) and its Host Plant (Vernonia polyanthes, Asteraceae)

IVONEIDE M. SILVA, GIOVANNA I. ANDRADE, G. WILSON FERNANDES+ and J. PIRES LEMOS FILHO

Ecologia Evolutiva de Herbívoros Tropicais/DBG, ICB/Universidade Federal de Minas Gerais, CP 486, 30161-970 Belo Horizonte MG—, Brasil Departamento de Botânica, ICB/Universidade Federal de Minas Gerais, CP 486, 30161-970 Belo Horizonte MG—, Brasil

July 19, 1995 ; January 5, 1996

We studied the impact caused byTomoplagia rudolphi Lutz & Costa Lima (Diptera: Tephritidae) on the architecture, flower production, seed germination and seed viability of its host plantVernonia polyanthes Less (Asteraceae). We measured the gall influence on the number of lateral shoots, on the production of flower heads and on seed viability. Gall formation induced a significant increase in the number of lateral shoots modifying the host plant normal growth pattern. Galled stems produced an average of 7.3±0.45 shoots, whereas ungalled stems produced 5.6±0.60 shoots. Galling also caused a significant reduction in seed viability. Seeds of galled stems had a total percent seed germination mean of 28.4%, while seeds of ungalled stems had a mean of 33.8%. However, flower head production and seed germination velocity were not affected by the gall. This study showed thatT. rudolphi galls influence the architecture and seed viability of its host plant.

Insect galls; herbivory; herbivore impact; plant growth; Tomoplagia rudolphi ; Vernonia polyanthes


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