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Strip-cutting was evaluated as a habitat manipulation approach to pest management in lucerne (Medicago sativa L). In a field experiment with linear replication, 20 m long strips were left uncut at each harvest to provide nectar, pollen and shelter. Sweep net and vacuum sampling were used to determine arthropod densities in the period after harvests. Predatory coccinellids (Micraspis frenata, Coccinella repanda and Diomus notescens) were significantly more numerous in uncut lucerne strips than in cut control areas in all three samples (December, January and February). Uncut strips also harboured significantly greater numbers of two predatory hemipterans (Nabis sp. and Oechalia schellembergii) in the first sample date, and of two unidentified hymenopterans in the last sample. In contrast, numbers of Helicoverpa spp. larvae and aphids were consistently greater in cut areas. We conclude that uncut lucerne strips provide important resources for several guilds of natural enemies and that this can lead to reduced populations of at least two key pests. However, on some sample dates the uncut strips harboured greater numbers of several potential pests (green mirid, Creontiades dilutus, and green vegetable bug Nezara viridula) so further work is required to determine the net effect on crop loss.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Habitat manipulation for lucerne: a renaissance for strip-cutting?