The existence of a continuous array of sympatric biotypes—from polymorphisms, through
ecological or host races with increasing reproductive isolation, to good species—can …

Planthoppers are herbivorous, sap-feeding homopterans that include several world-class
agricultural pests. Twenty families of planthoppers are recognized and collectively form the …

While we may have always assumed that insects employ auditory communication, our
understanding of it has been impeded by various technical challenges. In comparison to the …

(1) From 1973 to 1975 the effects of cutting on the invertebrates of Arrhenatherum-
dominated grassland were studied. Four treatments (cutting in May (M), July (J), both May …

Acoustic behaviour was studied in three closely related planthopper species of the genus
Muellerianella (Homoptera, Delphacidae). In order to establish interspecific differences …

From many possible topics, three are selected for discussion: the population dynamic
characteristics of successful control agents in theory and practice; host shifts and the risks …

Hybridization between two meiotic parthenogenetic species of root-knot nematodes,
Meloidogyne chitwoodi and M. fallax, was investigated in two different crossing experiments …

An increasing number of animal species of hybrid origin has been detected in recent years
in different groups. In the present paper many of such cases are reviewed in detail and the …

The leafhoppers and planthoppers (Hemiptera: Auchenorrhyncha) make up a relatively
species-rich group of phytophagous insects that feed by sucking plant sap. The central …

1. Host plant relations of closely related species and pseudogamous triploid forms of the
planthopper genus Ribautodelphax were studied. 2. From field data and experimental …