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The common black field cricket,    Gryllus   assimilis    (  Orthoptera  :   Gryllidae  ), damages young plants of red cedar,    Juniperus   virginiana    (  Cupressaceae  ); strawberry,   Fragaria   ×   ananassa   (  Rosaceae  ); sugarcane,    Saccharum   officinarum    (  Poaceae  ); teak,    Tectona   grandis    (  Lamiaceae  ); upland cotton,    Gossypium   hirsutum    (  Malvaceae  ); and, mainly,    Eucalyptus    spp. (  Myrtaceae  ). The objective of this study was to investigate the biological and behavioral parameters of this insect in the laboratory and in    Eucalyptus    spp. plantations in Inhambupe, Bahia State, Brazil. The incubation period and the viability of    G.   assimilis    eggs were 11.87 days and approximately 22%, respectively. The duration of the nymphal stage was 62.34 days with approximately 60% of the nymphs obtained in the laboratory being females. The average number of egg batches per female, eggs per female, and eggs per batch per female of this insect were 25.50, 862.17, and 34.65, respectively.    G.   assimilis    females lived for 76.50 days in the adult stage, and 138.34 days in total, from egg through nymph to adult. Males produced three characteristic sounds: one for the marking of territory, one for courtship, and one when alone.    G.   assimilis    fed primarily on weeds but, in their absence, it damaged young    Eucalyptus    spp. plants. This paper presents important data on the biology and behavior of    G.   assimilis   ; this information may encourage additional biological research, laboratory rearing, and integrated management of this pest.

journal of orthoptera research

Bioecological aspects of the common black field cricket,    Gryllus   assimilis    (  Orthoptera  :   Gryllidae  ) in the laboratory and in    Eucalyptus    (  Myrtaceae  ) plantations