Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Influence of ecological habitat on the occurrence and dynamics of Lygus lucorum Mayr and its natural predator.

Abstract

The population dynamics of Lygus lucorum and its main native predators in cotton fields with different ecological habitats were systemically investigated in China, from 2005 to 2007, to determine an economic and effective method of controlling L. lucorum damage on cotton. Ten treatments were grouped into 5 experimental sets (cotton fields close to and far from orchard fields, cotton fields planted with 54 000 plants/ha at even spacing and with 45 000 plants/ha at uneven spacing, rationally chemical controlled and non-chemical controlled cotton fields; mono-crop cotton field and sunflower-intercropping cotton field; and transgenic cry1A cotton field and transgenic Bt plus CpTI cotton field). The results indicated similar native predatory species composition in the cotton fields irrespective of the ecological habitat. The identified predators included Propylaea japonica [Propylea japonica], Coccinella septempunctata, Chrysoperla sinica [Chrysoperla nipponensis], C. septempunctata, Nabis sinoferus, Orius minutus, Pardosa t-insignita, Misumenops tricuspidatus and Erigondium gramincola [Hylyphantes graminicola]. Significant difference of L. lucorum and its natural predator population existed among in different ecological habitats. L. lucorum was effectively controlled in cotton fields far from orchard fields, planted at 45 000 plants/ha with uneven plant spacing and under rationally chemical controlled. Plantations of transgenic Bt plus CpTI cotton reduced L. lucorum, but had no effect on native predators. Intercropping with sunflower increased native predator number and reduced L. lucorum in cotton fields. The results suggested that planting transgenic Bt plus CpTI cotton in field far from orchard at rational density and uneven spacing with rational chemical control can effectively control L. lucorum in transgenic cotton fields.