The feeding preference of Diphaulaca viridipennis Clark, 1865, (Coleoptera: Chrysomelidae) was studied in eleven soybean genotypes, in four experiments under greenhouse conditions at Campinas, State of São Paulo, Brazil, during the summer of 1983/84. Three free-choice-type experiments were carried out. In the first, the plant introduction PI 227687 was less defoliated by D. viridipennis than the other genotypes: 'IAC 8', PI 171451, PI 229358 and 'Santa Rosa'; the latter was the most damaged. In the second and third experiments, PI 227687 and 'Santa Rosa' were utilized as resistant and susceptible checks respectively; the other six genotypes studied (PI 274453, IAC 78-2318, IAC 79-1823, IAC 80-1177, IAC 80-596-2 and D 72-9601-1) presented intermediate performance between the checks. A non-choice-type experiment was set up with the two checks, PI 227687 and 'Santa Rosa'; the percentage of leaf area eaten in both treatments was similar, indicating that the PI 227687 resistance to D. viridipennis disappears when there is obligatoriness in feeding conditions.
resistance to insects; feeding preference; soybean; Glycine max (L.) Merrill; Diphaulaca viridipennis Clark; 1865; leaf area eaten