earticle

영어

The pathogenicity of Butlerius sp. ANU501 against three major cruciferous insect pests: Artogeia rapae (Lepidoptera: Pieridae), Mamestra brassicae (Lepidoptera: Noctuidae), and Plutella xylostella (Lepidoptera: Yponomeutidae) was evaluated. In pot and greenhouse experiment, the larval mortality increased with an increasing dosage of nematodes. The efficacy in greenhouse varied with vegetable species, depending on the persistence time of nematode suspension on the vegetable leaves after spraying. Just after spraying nematodes, the remaining water content and live nematode number on leaf were 7.09 g and 49.6 nematodes for the vegetable Brassica lee ssp. Namai., and 6.37 g and 50.2 nematodes for Brassica junacea L., whereas values for Brassica oleracea L. var. acephala Alef. (D.C.) were very low, 4.16 g and 6.3 nematodes. In Brassica lee ssp. namai., Butlerius sp. ANU501 caused the highest efficacy against P. xylostella (88%), A. rapae (29%), and M. brassicae (37%), when applied at a rate of 3 x 1010 nematodes/ha. Butlerius sp. ANU501 did not provide satisfactory control for A. rapae and
M. brassicae, but were significantly effective in control of P. xylostella. This study shows that Butlerius sp. have the great potential as a biological control agent for P. xylostella in greenhouse.